int MPIR_Scan( const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPID_Comm *comm_ptr, int *errflag ) { int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; MPIU_CHKLMEM_DECL(3); MPIU_THREADPRIV_DECL; int rank = comm_ptr->rank; MPI_Status status; void *tempbuf = NULL, *localfulldata = NULL, *prefulldata = NULL; MPI_Aint true_lb, true_extent, extent; int noneed = 1; /* noneed=1 means no need to bcast tempbuf and reduce tempbuf & recvbuf */ /* In order to use the SMP-aware algorithm, the "op" can be either commutative or non-commutative, but we require a communicator in which all the nodes contain processes with consecutive ranks. */ if (!MPIR_Comm_is_node_consecutive(comm_ptr)) { /* We can't use the SMP-aware algorithm, use the generic one */ return MPIR_Scan_generic(sendbuf, recvbuf, count, datatype, op, comm_ptr, errflag); } MPIU_THREADPRIV_GET; MPIR_Type_get_true_extent_impl(datatype, &true_lb, &true_extent); MPID_Datatype_get_extent_macro(datatype, extent); MPID_Ensure_Aint_fits_in_pointer(count * MPIR_MAX(extent, true_extent)); MPIU_CHKLMEM_MALLOC(tempbuf, void *, count*(MPIR_MAX(extent, true_extent)), mpi_errno, "temporary buffer"); tempbuf = (void *)((char*)tempbuf - true_lb); /* Create prefulldata and localfulldata on local roots of all nodes */ if (comm_ptr->node_roots_comm != NULL) { MPIU_CHKLMEM_MALLOC(prefulldata, void *, count*(MPIR_MAX(extent, true_extent)), mpi_errno, "prefulldata for scan"); prefulldata = (void *)((char*)prefulldata - true_lb); if (comm_ptr->node_comm != NULL) { MPIU_CHKLMEM_MALLOC(localfulldata, void *, count*(MPIR_MAX(extent, true_extent)), mpi_errno, "localfulldata for scan"); localfulldata = (void *)((char*)localfulldata - true_lb); }
static int MPIR_Reduce_binomial ( const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPID_Comm *comm_ptr, int *errflag ) { int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; MPI_Status status; int comm_size, rank, is_commutative, type_size ATTRIBUTE((unused)); int mask, relrank, source, lroot; MPI_Aint true_lb, true_extent, extent; void *tmp_buf; MPI_Comm comm; MPIU_CHKLMEM_DECL(2); if (count == 0) return MPI_SUCCESS; comm = comm_ptr->handle; comm_size = comm_ptr->local_size; rank = comm_ptr->rank; /* Create a temporary buffer */ MPIR_Type_get_true_extent_impl(datatype, &true_lb, &true_extent); MPID_Datatype_get_extent_macro(datatype, extent); is_commutative = MPIR_Op_is_commutative(op); /* I think this is the worse case, so we can avoid an assert() * inside the for loop */ /* should be buf+{this}? */ MPID_Ensure_Aint_fits_in_pointer(count * MPIR_MAX(extent, true_extent)); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, count*(MPIR_MAX(extent,true_extent)), mpi_errno, "temporary buffer"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - true_lb); /* If I'm not the root, then my recvbuf may not be valid, therefore I have to allocate a temporary one */ if (rank != root) { MPIU_CHKLMEM_MALLOC(recvbuf, void *, count*(MPIR_MAX(extent,true_extent)), mpi_errno, "receive buffer"); recvbuf = (void *)((char*)recvbuf - true_lb); }
int MPIR_Alltoallv_inter(const void *sendbuf, const int *sendcounts, const int *sdispls, MPI_Datatype sendtype, void *recvbuf, const int *recvcounts, const int *rdispls, MPI_Datatype recvtype, MPID_Comm *comm_ptr, MPIR_Errflag_t *errflag) { /* Intercommunicator alltoallv. We use a pairwise exchange algorithm similar to the one used in intracommunicator alltoallv. Since the local and remote groups can be of different sizes, we first compute the max of local_group_size, remote_group_size. At step i, 0 <= i < max_size, each process receives from src = (rank - i + max_size) % max_size if src < remote_size, and sends to dst = (rank + i) % max_size if dst < remote_size. FIXME: change algorithm to match intracommunicator alltoallv */ int local_size, remote_size, max_size, i; MPI_Aint send_extent, recv_extent; int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; MPI_Status status; int src, dst, rank, sendcount, recvcount; char *sendaddr, *recvaddr; local_size = comm_ptr->local_size; remote_size = comm_ptr->remote_size; rank = comm_ptr->rank; /* Get extent of send and recv types */ MPID_Datatype_get_extent_macro(sendtype, send_extent); MPID_Datatype_get_extent_macro(recvtype, recv_extent); /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_ENTER( comm_ptr ); /* Use pairwise exchange algorithm. */ max_size = MPIR_MAX(local_size, remote_size); for (i=0; i<max_size; i++) { src = (rank - i + max_size) % max_size; dst = (rank + i) % max_size; if (src >= remote_size) { src = MPI_PROC_NULL; recvaddr = NULL; recvcount = 0; } else { MPIU_Ensure_Aint_fits_in_pointer(MPIU_VOID_PTR_CAST_TO_MPI_AINT recvbuf + rdispls[src]*recv_extent); recvaddr = (char *)recvbuf + rdispls[src]*recv_extent; recvcount = recvcounts[src]; } if (dst >= remote_size) { dst = MPI_PROC_NULL; sendaddr = NULL; sendcount = 0; } else { MPIU_Ensure_Aint_fits_in_pointer(MPIU_VOID_PTR_CAST_TO_MPI_AINT sendbuf + sdispls[dst]*send_extent); sendaddr = (char *)sendbuf + sdispls[dst]*send_extent; sendcount = sendcounts[dst]; } mpi_errno = MPIC_Sendrecv(sendaddr, sendcount, sendtype, dst, MPIR_ALLTOALLV_TAG, recvaddr, recvcount, recvtype, src, MPIR_ALLTOALLV_TAG, comm_ptr, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = MPIR_ERR_GET_CLASS(mpi_errno); MPIR_ERR_SET(mpi_errno, *errflag, "**fail"); MPIR_ERR_ADD(mpi_errno_ret, mpi_errno); } } fn_exit: /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_EXIT( comm_ptr ); if (mpi_errno_ret) mpi_errno = mpi_errno_ret; else if (*errflag != MPIR_ERR_NONE) MPIR_ERR_SET(mpi_errno, *errflag, "**coll_fail"); return mpi_errno; fn_fail: goto fn_exit; }
int MPIR_Iallreduce_redscat_allgather(const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPID_Comm *comm_ptr, MPID_Sched_t s) { int mpi_errno = MPI_SUCCESS; int comm_size, rank, newrank, pof2, rem; int i, send_idx, recv_idx, last_idx, mask, newdst, dst, send_cnt, recv_cnt; MPI_Aint true_lb, true_extent, extent; void *tmp_buf = NULL; int *cnts, *disps; MPIR_SCHED_CHKPMEM_DECL(1); MPIU_CHKLMEM_DECL(2); /* we only support builtin datatypes for now, breaking up user types to do * the reduce-scatter is tricky */ MPIU_Assert(HANDLE_GET_KIND(op) == HANDLE_KIND_BUILTIN); comm_size = comm_ptr->local_size; rank = comm_ptr->rank; /* need to allocate temporary buffer to store incoming data*/ MPIR_Type_get_true_extent_impl(datatype, &true_lb, &true_extent); MPID_Datatype_get_extent_macro(datatype, extent); MPID_Ensure_Aint_fits_in_pointer(count * MPIR_MAX(extent, true_extent)); MPIR_SCHED_CHKPMEM_MALLOC(tmp_buf, void *, count*(MPIR_MAX(extent,true_extent)), mpi_errno, "temporary buffer"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - true_lb); /* copy local data into recvbuf */ if (sendbuf != MPI_IN_PLACE) { mpi_errno = MPID_Sched_copy(sendbuf, count, datatype, recvbuf, count, datatype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); } /* find nearest power-of-two less than or equal to comm_size */ pof2 = 1; while (pof2 <= comm_size) pof2 <<= 1; pof2 >>=1; rem = comm_size - pof2; /* In the non-power-of-two case, all even-numbered processes of rank < 2*rem send their data to (rank+1). These even-numbered processes no longer participate in the algorithm until the very end. The remaining processes form a nice power-of-two. */ if (rank < 2*rem) { if (rank % 2 == 0) { /* even */ mpi_errno = MPID_Sched_send(recvbuf, count, datatype, rank+1, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* temporarily set the rank to -1 so that this process does not pariticipate in recursive doubling */ newrank = -1; } else { /* odd */ mpi_errno = MPID_Sched_recv(tmp_buf, count, datatype, rank-1, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* do the reduction on received data. since the ordering is right, it doesn't matter whether the operation is commutative or not. */ mpi_errno = MPID_Sched_reduce(tmp_buf, recvbuf, count, datatype, op, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* change the rank */ newrank = rank / 2; } } else /* rank >= 2*rem */ newrank = rank - rem; if (newrank != -1) { /* for the reduce-scatter, calculate the count that each process receives and the displacement within the buffer */ /* TODO I (goodell@) believe that these counts and displacements could be * calculated directly during the loop, rather than requiring a less-scalable * "2*pof2"-sized memory allocation */ MPIU_CHKLMEM_MALLOC(cnts, int *, pof2*sizeof(int), mpi_errno, "counts"); MPIU_CHKLMEM_MALLOC(disps, int *, pof2*sizeof(int), mpi_errno, "displacements"); MPIU_Assert(count >= pof2); /* the cnts calculations assume this */ for (i=0; i<(pof2-1); i++) cnts[i] = count/pof2; cnts[pof2-1] = count - (count/pof2)*(pof2-1); disps[0] = 0; for (i=1; i<pof2; i++) disps[i] = disps[i-1] + cnts[i-1]; mask = 0x1; send_idx = recv_idx = 0; last_idx = pof2; while (mask < pof2) { newdst = newrank ^ mask; /* find real rank of dest */ dst = (newdst < rem) ? newdst*2 + 1 : newdst + rem; send_cnt = recv_cnt = 0; if (newrank < newdst) { send_idx = recv_idx + pof2/(mask*2); for (i=send_idx; i<last_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<send_idx; i++) recv_cnt += cnts[i]; } else { recv_idx = send_idx + pof2/(mask*2); for (i=send_idx; i<recv_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<last_idx; i++) recv_cnt += cnts[i]; } /* Send data from recvbuf. Recv into tmp_buf */ mpi_errno = MPID_Sched_recv(((char *)tmp_buf + disps[recv_idx]*extent), recv_cnt, datatype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); /* sendrecv, no barrier here */ mpi_errno = MPID_Sched_send(((char *)recvbuf + disps[send_idx]*extent), send_cnt, datatype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* tmp_buf contains data received in this step. recvbuf contains data accumulated so far */ /* This algorithm is used only for predefined ops and predefined ops are always commutative. */ mpi_errno = MPID_Sched_reduce(((char *)tmp_buf + disps[recv_idx]*extent), ((char *)recvbuf + disps[recv_idx]*extent), recv_cnt, datatype, op, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* update send_idx for next iteration */ send_idx = recv_idx; mask <<= 1; /* update last_idx, but not in last iteration because the value is needed in the allgather step below. */ if (mask < pof2) last_idx = recv_idx + pof2/mask; } /* now do the allgather */ mask >>= 1; while (mask > 0) { newdst = newrank ^ mask; /* find real rank of dest */ dst = (newdst < rem) ? newdst*2 + 1 : newdst + rem; send_cnt = recv_cnt = 0; if (newrank < newdst) { /* update last_idx except on first iteration */ if (mask != pof2/2) last_idx = last_idx + pof2/(mask*2); recv_idx = send_idx + pof2/(mask*2); for (i=send_idx; i<recv_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<last_idx; i++) recv_cnt += cnts[i]; } else { recv_idx = send_idx - pof2/(mask*2); for (i=send_idx; i<last_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<send_idx; i++) recv_cnt += cnts[i]; } mpi_errno = MPID_Sched_recv(((char *)recvbuf + disps[recv_idx]*extent), recv_cnt, datatype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); /* sendrecv, no barrier here */ mpi_errno = MPID_Sched_send(((char *)recvbuf + disps[send_idx]*extent), send_cnt, datatype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); if (newrank > newdst) send_idx = recv_idx; mask >>= 1; } }
int MPIR_Allreduce_intra ( void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPID_Comm *comm_ptr, int *errflag ) { int is_homogeneous; #ifdef MPID_HAS_HETERO int rc; #endif int comm_size, rank, type_size; int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; int mask, dst, is_commutative, pof2, newrank, rem, newdst, i, send_idx, recv_idx, last_idx, send_cnt, recv_cnt, *cnts, *disps; MPI_Aint true_extent, true_lb, extent; void *tmp_buf; MPI_Comm comm; MPIU_CHKLMEM_DECL(3); /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_ENTER( comm_ptr ); if (count == 0) goto fn_exit; comm = comm_ptr->handle; is_commutative = MPIR_Op_is_commutative(op); #if defined(USE_SMP_COLLECTIVES) /* is the op commutative? We do SMP optimizations only if it is. */ if (MPIR_Comm_is_node_aware(comm_ptr) && is_commutative) { /* on each node, do a reduce to the local root */ if (comm_ptr->node_comm != NULL) { /* take care of the MPI_IN_PLACE case. For reduce, MPI_IN_PLACE is specified only on the root; for allreduce it is specified on all processes. */ if ((sendbuf == MPI_IN_PLACE) && (comm_ptr->node_comm->rank != 0)) { /* IN_PLACE and not root of reduce. Data supplied to this allreduce is in recvbuf. Pass that as the sendbuf to reduce. */ mpi_errno = MPIR_Reduce_impl(recvbuf, NULL, count, datatype, op, 0, comm_ptr->node_comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } else { mpi_errno = MPIR_Reduce_impl(sendbuf, recvbuf, count, datatype, op, 0, comm_ptr->node_comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } } else { /* only one process on the node. copy sendbuf to recvbuf */ if (sendbuf != MPI_IN_PLACE) { mpi_errno = MPIR_Localcopy(sendbuf, count, datatype, recvbuf, count, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } } /* now do an IN_PLACE allreduce among the local roots of all nodes */ if (comm_ptr->node_roots_comm != NULL) { mpi_errno = allreduce_intra_or_coll_fn(MPI_IN_PLACE, recvbuf, count, datatype, op, comm_ptr->node_roots_comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } /* now broadcast the result among local processes */ if (comm_ptr->node_comm != NULL) { mpi_errno = MPIR_Bcast_impl(recvbuf, count, datatype, 0, comm_ptr->node_comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } goto fn_exit; } #endif is_homogeneous = 1; #ifdef MPID_HAS_HETERO if (comm_ptr->is_hetero) is_homogeneous = 0; #endif #ifdef MPID_HAS_HETERO if (!is_homogeneous) { /* heterogeneous. To get the same result on all processes, we do a reduce to 0 and then broadcast. */ mpi_errno = MPIR_Reduce_impl ( sendbuf, recvbuf, count, datatype, op, 0, comm_ptr, errflag ); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } mpi_errno = MPIR_Bcast_impl( recvbuf, count, datatype, 0, comm_ptr, errflag ); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } else #endif /* MPID_HAS_HETERO */ { /* homogeneous */ comm_size = comm_ptr->local_size; rank = comm_ptr->rank; is_commutative = MPIR_Op_is_commutative(op); /* need to allocate temporary buffer to store incoming data*/ MPIR_Type_get_true_extent_impl(datatype, &true_lb, &true_extent); MPID_Datatype_get_extent_macro(datatype, extent); MPID_Ensure_Aint_fits_in_pointer(count * MPIR_MAX(extent, true_extent)); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, count*(MPIR_MAX(extent,true_extent)), mpi_errno, "temporary buffer"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - true_lb); /* copy local data into recvbuf */ if (sendbuf != MPI_IN_PLACE) { mpi_errno = MPIR_Localcopy(sendbuf, count, datatype, recvbuf, count, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } MPID_Datatype_get_size_macro(datatype, type_size); /* find nearest power-of-two less than or equal to comm_size */ pof2 = 1; while (pof2 <= comm_size) pof2 <<= 1; pof2 >>=1; rem = comm_size - pof2; /* In the non-power-of-two case, all even-numbered processes of rank < 2*rem send their data to (rank+1). These even-numbered processes no longer participate in the algorithm until the very end. The remaining processes form a nice power-of-two. */ if (rank < 2*rem) { if (rank % 2 == 0) { /* even */ mpi_errno = MPIC_Send_ft(recvbuf, count, datatype, rank+1, MPIR_ALLREDUCE_TAG, comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* temporarily set the rank to -1 so that this process does not pariticipate in recursive doubling */ newrank = -1; } else { /* odd */ mpi_errno = MPIC_Recv_ft(tmp_buf, count, datatype, rank-1, MPIR_ALLREDUCE_TAG, comm, MPI_STATUS_IGNORE, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* do the reduction on received data. since the ordering is right, it doesn't matter whether the operation is commutative or not. */ mpi_errno = MPIR_Reduce_local_impl(tmp_buf, recvbuf, count, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); /* change the rank */ newrank = rank / 2; } } else /* rank >= 2*rem */ newrank = rank - rem; /* If op is user-defined or count is less than pof2, use recursive doubling algorithm. Otherwise do a reduce-scatter followed by allgather. (If op is user-defined, derived datatypes are allowed and the user could pass basic datatypes on one process and derived on another as long as the type maps are the same. Breaking up derived datatypes to do the reduce-scatter is tricky, therefore using recursive doubling in that case.) */ if (newrank != -1) { if ((count*type_size <= MPIR_PARAM_ALLREDUCE_SHORT_MSG_SIZE) || (HANDLE_GET_KIND(op) != HANDLE_KIND_BUILTIN) || (count < pof2)) { /* use recursive doubling */ mask = 0x1; while (mask < pof2) { newdst = newrank ^ mask; /* find real rank of dest */ dst = (newdst < rem) ? newdst*2 + 1 : newdst + rem; /* Send the most current data, which is in recvbuf. Recv into tmp_buf */ mpi_errno = MPIC_Sendrecv_ft(recvbuf, count, datatype, dst, MPIR_ALLREDUCE_TAG, tmp_buf, count, datatype, dst, MPIR_ALLREDUCE_TAG, comm, MPI_STATUS_IGNORE, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* tmp_buf contains data received in this step. recvbuf contains data accumulated so far */ if (is_commutative || (dst < rank)) { /* op is commutative OR the order is already right */ mpi_errno = MPIR_Reduce_local_impl(tmp_buf, recvbuf, count, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } else { /* op is noncommutative and the order is not right */ mpi_errno = MPIR_Reduce_local_impl(recvbuf, tmp_buf, count, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); /* copy result back into recvbuf */ mpi_errno = MPIR_Localcopy(tmp_buf, count, datatype, recvbuf, count, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } mask <<= 1; } } else { /* do a reduce-scatter followed by allgather */ /* for the reduce-scatter, calculate the count that each process receives and the displacement within the buffer */ MPIU_CHKLMEM_MALLOC(cnts, int *, pof2*sizeof(int), mpi_errno, "counts"); MPIU_CHKLMEM_MALLOC(disps, int *, pof2*sizeof(int), mpi_errno, "displacements"); for (i=0; i<(pof2-1); i++) cnts[i] = count/pof2; cnts[pof2-1] = count - (count/pof2)*(pof2-1); disps[0] = 0; for (i=1; i<pof2; i++) disps[i] = disps[i-1] + cnts[i-1]; mask = 0x1; send_idx = recv_idx = 0; last_idx = pof2; while (mask < pof2) { newdst = newrank ^ mask; /* find real rank of dest */ dst = (newdst < rem) ? newdst*2 + 1 : newdst + rem; send_cnt = recv_cnt = 0; if (newrank < newdst) { send_idx = recv_idx + pof2/(mask*2); for (i=send_idx; i<last_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<send_idx; i++) recv_cnt += cnts[i]; } else { recv_idx = send_idx + pof2/(mask*2); for (i=send_idx; i<recv_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<last_idx; i++) recv_cnt += cnts[i]; } /* printf("Rank %d, send_idx %d, recv_idx %d, send_cnt %d, recv_cnt %d, last_idx %d\n", newrank, send_idx, recv_idx, send_cnt, recv_cnt, last_idx); */ /* Send data from recvbuf. Recv into tmp_buf */ mpi_errno = MPIC_Sendrecv_ft((char *) recvbuf + disps[send_idx]*extent, send_cnt, datatype, dst, MPIR_ALLREDUCE_TAG, (char *) tmp_buf + disps[recv_idx]*extent, recv_cnt, datatype, dst, MPIR_ALLREDUCE_TAG, comm, MPI_STATUS_IGNORE, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* tmp_buf contains data received in this step. recvbuf contains data accumulated so far */ /* This algorithm is used only for predefined ops and predefined ops are always commutative. */ mpi_errno = MPIR_Reduce_local_impl(((char *) tmp_buf + disps[recv_idx]*extent), ((char *) recvbuf + disps[recv_idx]*extent), recv_cnt, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); /* update send_idx for next iteration */ send_idx = recv_idx; mask <<= 1; /* update last_idx, but not in last iteration because the value is needed in the allgather step below. */ if (mask < pof2) last_idx = recv_idx + pof2/mask; } /* now do the allgather */ mask >>= 1; while (mask > 0) { newdst = newrank ^ mask; /* find real rank of dest */ dst = (newdst < rem) ? newdst*2 + 1 : newdst + rem; send_cnt = recv_cnt = 0; if (newrank < newdst) { /* update last_idx except on first iteration */ if (mask != pof2/2) last_idx = last_idx + pof2/(mask*2); recv_idx = send_idx + pof2/(mask*2); for (i=send_idx; i<recv_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<last_idx; i++) recv_cnt += cnts[i]; } else { recv_idx = send_idx - pof2/(mask*2); for (i=send_idx; i<last_idx; i++) send_cnt += cnts[i]; for (i=recv_idx; i<send_idx; i++) recv_cnt += cnts[i]; } mpi_errno = MPIC_Sendrecv_ft((char *) recvbuf + disps[send_idx]*extent, send_cnt, datatype, dst, MPIR_ALLREDUCE_TAG, (char *) recvbuf + disps[recv_idx]*extent, recv_cnt, datatype, dst, MPIR_ALLREDUCE_TAG, comm, MPI_STATUS_IGNORE, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } if (newrank > newdst) send_idx = recv_idx; mask >>= 1; } } } /* In the non-power-of-two case, all odd-numbered processes of rank < 2*rem send the result to (rank-1), the ranks who didn't participate above. */ if (rank < 2*rem) { if (rank % 2) /* odd */ mpi_errno = MPIC_Send_ft(recvbuf, count, datatype, rank-1, MPIR_ALLREDUCE_TAG, comm, errflag); else /* even */ mpi_errno = MPIC_Recv_ft(recvbuf, count, datatype, rank+1, MPIR_ALLREDUCE_TAG, comm, MPI_STATUS_IGNORE, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } } fn_exit: /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_EXIT( comm_ptr ); MPIU_CHKLMEM_FREEALL(); if (mpi_errno_ret) mpi_errno = mpi_errno_ret; return (mpi_errno); fn_fail: goto fn_exit; }
static int MPIR_Scan_generic ( const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPID_Comm *comm_ptr, int *errflag ) { MPI_Status status; int rank, comm_size; int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; int mask, dst, is_commutative; MPI_Aint true_extent, true_lb, extent; void *partial_scan, *tmp_buf; MPID_Op *op_ptr; MPI_Comm comm; MPIU_THREADPRIV_DECL; MPIU_CHKLMEM_DECL(2); if (count == 0) return MPI_SUCCESS; /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_ENTER( comm_ptr ); comm = comm_ptr->handle; comm_size = comm_ptr->local_size; rank = comm_ptr->rank; MPIU_THREADPRIV_GET; /* set op_errno to 0. stored in perthread structure */ MPIU_THREADPRIV_FIELD(op_errno) = 0; if (HANDLE_GET_KIND(op) == HANDLE_KIND_BUILTIN) { is_commutative = 1; } else { MPID_Op_get_ptr(op, op_ptr); if (op_ptr->kind == MPID_OP_USER_NONCOMMUTE) is_commutative = 0; else is_commutative = 1; } /* need to allocate temporary buffer to store partial scan*/ MPIR_Type_get_true_extent_impl(datatype, &true_lb, &true_extent); MPID_Datatype_get_extent_macro(datatype, extent); MPIU_CHKLMEM_MALLOC(partial_scan, void *, count*(MPIR_MAX(extent,true_extent)), mpi_errno, "partial_scan"); /* This eventually gets malloc()ed as a temp buffer, not added to * any user buffers */ MPID_Ensure_Aint_fits_in_pointer(count * MPIR_MAX(extent, true_extent)); /* adjust for potential negative lower bound in datatype */ partial_scan = (void *)((char*)partial_scan - true_lb); /* need to allocate temporary buffer to store incoming data*/ MPIU_CHKLMEM_MALLOC(tmp_buf, void *, count*(MPIR_MAX(extent,true_extent)), mpi_errno, "tmp_buf"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - true_lb); /* Since this is an inclusive scan, copy local contribution into recvbuf. */ if (sendbuf != MPI_IN_PLACE) { mpi_errno = MPIR_Localcopy(sendbuf, count, datatype, recvbuf, count, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } if (sendbuf != MPI_IN_PLACE) mpi_errno = MPIR_Localcopy(sendbuf, count, datatype, partial_scan, count, datatype); else mpi_errno = MPIR_Localcopy(recvbuf, count, datatype, partial_scan, count, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mask = 0x1; while (mask < comm_size) { dst = rank ^ mask; if (dst < comm_size) { /* Send partial_scan to dst. Recv into tmp_buf */ mpi_errno = MPIC_Sendrecv(partial_scan, count, datatype, dst, MPIR_SCAN_TAG, tmp_buf, count, datatype, dst, MPIR_SCAN_TAG, comm, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } if (rank > dst) { mpi_errno = MPIR_Reduce_local_impl( tmp_buf, partial_scan, count, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPIR_Reduce_local_impl( tmp_buf, recvbuf, count, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } else { if (is_commutative) { mpi_errno = MPIR_Reduce_local_impl( tmp_buf, partial_scan, count, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } else { mpi_errno = MPIR_Reduce_local_impl( partial_scan, tmp_buf, count, datatype, op); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPIR_Localcopy(tmp_buf, count, datatype, partial_scan, count, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } } } mask <<= 1; } if (MPIU_THREADPRIV_FIELD(op_errno)) { mpi_errno = MPIU_THREADPRIV_FIELD(op_errno); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } fn_exit: MPIU_CHKLMEM_FREEALL(); /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_EXIT( comm_ptr ); if (mpi_errno_ret) mpi_errno = mpi_errno_ret; else if (*errflag) MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**coll_fail"); return mpi_errno; fn_fail: goto fn_exit; }
int MPIR_Ialltoall_inter(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPID_Comm *comm_ptr, MPID_Sched_t s) { /* Intercommunicator alltoall. We use a pairwise exchange algorithm similar to the one used in intracommunicator alltoall for long messages. Since the local and remote groups can be of different sizes, we first compute the max of local_group_size, remote_group_size. At step i, 0 <= i < max_size, each process receives from src = (rank - i + max_size) % max_size if src < remote_size, and sends to dst = (rank + i) % max_size if dst < remote_size. */ int mpi_errno = MPI_SUCCESS; int local_size, remote_size, max_size, i; MPI_Aint sendtype_extent, recvtype_extent; int src, dst, rank; char *sendaddr, *recvaddr; local_size = comm_ptr->local_size; remote_size = comm_ptr->remote_size; rank = comm_ptr->rank; /* Get extent of send and recv types */ MPID_Datatype_get_extent_macro(sendtype, sendtype_extent); MPID_Datatype_get_extent_macro(recvtype, recvtype_extent); /* Do the pairwise exchanges */ max_size = MPIR_MAX(local_size, remote_size); MPID_Ensure_Aint_fits_in_pointer(MPI_VOID_PTR_CAST_TO_MPI_AINT recvbuf + max_size*recvcount*recvtype_extent); MPID_Ensure_Aint_fits_in_pointer(MPI_VOID_PTR_CAST_TO_MPI_AINT sendbuf + max_size*sendcount*sendtype_extent); for (i = 0; i < max_size; i++) { src = (rank - i + max_size) % max_size; dst = (rank + i) % max_size; if (src >= remote_size) { src = MPI_PROC_NULL; recvaddr = NULL; } else { recvaddr = (char *)recvbuf + src*recvcount*recvtype_extent; } if (dst >= remote_size) { dst = MPI_PROC_NULL; sendaddr = NULL; } else { sendaddr = (char *)sendbuf + dst*sendcount*sendtype_extent; } mpi_errno = MPID_Sched_send(sendaddr, sendcount, sendtype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPID_Sched_recv(recvaddr, recvcount, recvtype, src, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); } fn_exit: return mpi_errno; fn_fail: goto fn_exit; }
/* not declared static because a machine-specific function may call this one in some cases */ int MPIR_Reduce_scatter_block_intra ( const void *sendbuf, void *recvbuf, int recvcount, MPI_Datatype datatype, MPI_Op op, MPID_Comm *comm_ptr, int *errflag ) { int rank, comm_size, i; MPI_Aint extent, true_extent, true_lb; int *disps; void *tmp_recvbuf, *tmp_results; int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; int type_size, dis[2], blklens[2], total_count, nbytes, src, dst; int mask, dst_tree_root, my_tree_root, j, k; int *newcnts, *newdisps, rem, newdst, send_idx, recv_idx, last_idx, send_cnt, recv_cnt; int pof2, old_i, newrank, received; MPI_Datatype sendtype, recvtype; int nprocs_completed, tmp_mask, tree_root, is_commutative; MPID_Op *op_ptr; MPI_Comm comm; MPIU_THREADPRIV_DECL; MPIU_CHKLMEM_DECL(5); comm = comm_ptr->handle; comm_size = comm_ptr->local_size; rank = comm_ptr->rank; /* set op_errno to 0. stored in perthread structure */ MPIU_THREADPRIV_GET; MPIU_THREADPRIV_FIELD(op_errno) = 0; if (recvcount == 0) { goto fn_exit; } MPID_Datatype_get_extent_macro(datatype, extent); MPIR_Type_get_true_extent_impl(datatype, &true_lb, &true_extent); if (HANDLE_GET_KIND(op) == HANDLE_KIND_BUILTIN) { is_commutative = 1; } else { MPID_Op_get_ptr(op, op_ptr); if (op_ptr->kind == MPID_OP_USER_NONCOMMUTE) is_commutative = 0; else is_commutative = 1; } MPIU_CHKLMEM_MALLOC(disps, int *, comm_size * sizeof(int), mpi_errno, "disps"); total_count = comm_size*recvcount; for (i=0; i<comm_size; i++) { disps[i] = i*recvcount; } MPID_Datatype_get_size_macro(datatype, type_size); nbytes = total_count * type_size; /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_ENTER( comm_ptr ); /* total_count*extent eventually gets malloced. it isn't added to * a user-passed in buffer */ MPID_Ensure_Aint_fits_in_pointer(total_count * MPIR_MAX(true_extent, extent)); if ((is_commutative) && (nbytes < MPIR_PARAM_REDSCAT_COMMUTATIVE_LONG_MSG_SIZE)) { /* commutative and short. use recursive halving algorithm */ /* allocate temp. buffer to receive incoming data */ MPIU_CHKLMEM_MALLOC(tmp_recvbuf, void *, total_count*(MPIR_MAX(true_extent,extent)), mpi_errno, "tmp_recvbuf"); /* adjust for potential negative lower bound in datatype */ tmp_recvbuf = (void *)((char*)tmp_recvbuf - true_lb); /* need to allocate another temporary buffer to accumulate results because recvbuf may not be big enough */ MPIU_CHKLMEM_MALLOC(tmp_results, void *, total_count*(MPIR_MAX(true_extent,extent)), mpi_errno, "tmp_results"); /* adjust for potential negative lower bound in datatype */ tmp_results = (void *)((char*)tmp_results - true_lb); /* copy sendbuf into tmp_results */ if (sendbuf != MPI_IN_PLACE) mpi_errno = MPIR_Localcopy(sendbuf, total_count, datatype, tmp_results, total_count, datatype); else mpi_errno = MPIR_Localcopy(recvbuf, total_count, datatype, tmp_results, total_count, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); pof2 = 1; while (pof2 <= comm_size) pof2 <<= 1; pof2 >>=1; rem = comm_size - pof2; /* In the non-power-of-two case, all even-numbered processes of rank < 2*rem send their data to (rank+1). These even-numbered processes no longer participate in the algorithm until the very end. The remaining processes form a nice power-of-two. */ if (rank < 2*rem) { if (rank % 2 == 0) { /* even */ mpi_errno = MPIC_Send_ft(tmp_results, total_count, datatype, rank+1, MPIR_REDUCE_SCATTER_BLOCK_TAG, comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* temporarily set the rank to -1 so that this process does not pariticipate in recursive doubling */ newrank = -1; } else { /* odd */ mpi_errno = MPIC_Recv_ft(tmp_recvbuf, total_count, datatype, rank-1, MPIR_REDUCE_SCATTER_BLOCK_TAG, comm, MPI_STATUS_IGNORE, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* do the reduction on received data. since the ordering is right, it doesn't matter whether the operation is commutative or not. */ mpi_errno = MPIR_Reduce_local_impl( tmp_recvbuf, tmp_results, total_count, datatype, op); /* change the rank */ newrank = rank / 2; } } else /* rank >= 2*rem */ newrank = rank - rem; if (newrank != -1) { /* recalculate the recvcnts and disps arrays because the even-numbered processes who no longer participate will have their result calculated by the process to their right (rank+1). */ MPIU_CHKLMEM_MALLOC(newcnts, int *, pof2*sizeof(int), mpi_errno, "newcnts"); MPIU_CHKLMEM_MALLOC(newdisps, int *, pof2*sizeof(int), mpi_errno, "newdisps"); for (i=0; i<pof2; i++) { /* what does i map to in the old ranking? */ old_i = (i < rem) ? i*2 + 1 : i + rem; if (old_i < 2*rem) { /* This process has to also do its left neighbor's work */ newcnts[i] = 2 * recvcount; } else newcnts[i] = recvcount; } newdisps[0] = 0; for (i=1; i<pof2; i++) newdisps[i] = newdisps[i-1] + newcnts[i-1]; mask = pof2 >> 1; send_idx = recv_idx = 0; last_idx = pof2; while (mask > 0) { newdst = newrank ^ mask; /* find real rank of dest */ dst = (newdst < rem) ? newdst*2 + 1 : newdst + rem; send_cnt = recv_cnt = 0; if (newrank < newdst) { send_idx = recv_idx + mask; for (i=send_idx; i<last_idx; i++) send_cnt += newcnts[i]; for (i=recv_idx; i<send_idx; i++) recv_cnt += newcnts[i]; } else { recv_idx = send_idx + mask; for (i=send_idx; i<recv_idx; i++) send_cnt += newcnts[i]; for (i=recv_idx; i<last_idx; i++) recv_cnt += newcnts[i]; } /* printf("Rank %d, send_idx %d, recv_idx %d, send_cnt %d, recv_cnt %d, last_idx %d\n", newrank, send_idx, recv_idx, send_cnt, recv_cnt, last_idx); */ /* Send data from tmp_results. Recv into tmp_recvbuf */ if ((send_cnt != 0) && (recv_cnt != 0)) mpi_errno = MPIC_Sendrecv_ft((char *) tmp_results + newdisps[send_idx]*extent, send_cnt, datatype, dst, MPIR_REDUCE_SCATTER_BLOCK_TAG, (char *) tmp_recvbuf + newdisps[recv_idx]*extent, recv_cnt, datatype, dst, MPIR_REDUCE_SCATTER_BLOCK_TAG, comm, MPI_STATUS_IGNORE, errflag); else if ((send_cnt == 0) && (recv_cnt != 0)) mpi_errno = MPIC_Recv_ft((char *) tmp_recvbuf + newdisps[recv_idx]*extent, recv_cnt, datatype, dst, MPIR_REDUCE_SCATTER_BLOCK_TAG, comm, MPI_STATUS_IGNORE, errflag); else if ((recv_cnt == 0) && (send_cnt != 0)) mpi_errno = MPIC_Send_ft((char *) tmp_results + newdisps[send_idx]*extent, send_cnt, datatype, dst, MPIR_REDUCE_SCATTER_BLOCK_TAG, comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* tmp_recvbuf contains data received in this step. tmp_results contains data accumulated so far */ if (recv_cnt) { mpi_errno = MPIR_Reduce_local_impl( (char *) tmp_recvbuf + newdisps[recv_idx]*extent, (char *) tmp_results + newdisps[recv_idx]*extent, recv_cnt, datatype, op); } /* update send_idx for next iteration */ send_idx = recv_idx; last_idx = recv_idx + mask; mask >>= 1; } /* copy this process's result from tmp_results to recvbuf */ mpi_errno = MPIR_Localcopy((char *)tmp_results + disps[rank]*extent, recvcount, datatype, recvbuf, recvcount, datatype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); }
int MPIDI_Get_accumulate(const void *origin_addr, int origin_count, MPI_Datatype origin_datatype, void *result_addr, int result_count, MPI_Datatype result_datatype, int target_rank, MPI_Aint target_disp, int target_count, MPI_Datatype target_datatype, MPI_Op op, MPID_Win *win_ptr) { int mpi_errno = MPI_SUCCESS; MPIDI_msg_sz_t data_sz; int rank, origin_predefined, result_predefined, target_predefined; int shm_locked = 0; int dt_contig ATTRIBUTE((unused)); MPI_Aint dt_true_lb ATTRIBUTE((unused)); MPID_Datatype *dtp; MPIU_CHKLMEM_DECL(2); MPIDI_STATE_DECL(MPID_STATE_MPIDI_GET_ACCUMULATE); MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_GET_ACCUMULATE); if (target_rank == MPI_PROC_NULL) { goto fn_exit; } if (win_ptr->epoch_state == MPIDI_EPOCH_NONE && win_ptr->fence_issued) { win_ptr->epoch_state = MPIDI_EPOCH_FENCE; } MPIU_ERR_CHKANDJUMP(win_ptr->epoch_state == MPIDI_EPOCH_NONE, mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync"); MPIDI_Datatype_get_info(target_count, target_datatype, dt_contig, data_sz, dtp, dt_true_lb); if (data_sz == 0) { goto fn_exit; } rank = win_ptr->myrank; origin_predefined = TRUE; /* quiet uninitialized warnings (b/c goto) */ if (op != MPI_NO_OP) { MPIDI_CH3I_DATATYPE_IS_PREDEFINED(origin_datatype, origin_predefined); } MPIDI_CH3I_DATATYPE_IS_PREDEFINED(result_datatype, result_predefined); MPIDI_CH3I_DATATYPE_IS_PREDEFINED(target_datatype, target_predefined); /* Do =! rank first (most likely branch?) */ if (target_rank == rank || win_ptr->create_flavor == MPI_WIN_FLAVOR_SHARED) { MPI_User_function *uop; void *base; int disp_unit; if (win_ptr->create_flavor == MPI_WIN_FLAVOR_SHARED) { base = win_ptr->shm_base_addrs[target_rank]; disp_unit = win_ptr->disp_units[target_rank]; MPIDI_CH3I_SHM_MUTEX_LOCK(win_ptr); shm_locked = 1; } else { base = win_ptr->base; disp_unit = win_ptr->disp_unit; } /* Perform the local get first, then the accumulate */ mpi_errno = MPIR_Localcopy((char *) base + disp_unit * target_disp, target_count, target_datatype, result_addr, result_count, result_datatype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } /* NO_OP: Don't perform the accumulate */ if (op == MPI_NO_OP) { if (shm_locked) { MPIDI_CH3I_SHM_MUTEX_UNLOCK(win_ptr); shm_locked = 0; } goto fn_exit; } if (op == MPI_REPLACE) { mpi_errno = MPIR_Localcopy(origin_addr, origin_count, origin_datatype, (char *) base + disp_unit * target_disp, target_count, target_datatype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } if (shm_locked) { MPIDI_CH3I_SHM_MUTEX_UNLOCK(win_ptr); shm_locked = 0; } goto fn_exit; } MPIU_ERR_CHKANDJUMP1((HANDLE_GET_KIND(op) != HANDLE_KIND_BUILTIN), mpi_errno, MPI_ERR_OP, "**opnotpredefined", "**opnotpredefined %d", op ); /* get the function by indexing into the op table */ uop = MPIR_OP_HDL_TO_FN(op); if (origin_predefined && target_predefined) { /* Cast away const'ness for origin_address in order to * avoid changing the prototype for MPI_User_function */ (*uop)((void *) origin_addr, (char *) base + disp_unit*target_disp, &target_count, &target_datatype); } else { /* derived datatype */ MPID_Segment *segp; DLOOP_VECTOR *dloop_vec; MPI_Aint first, last; int vec_len, i, type_size, count; MPI_Datatype type; MPI_Aint true_lb, true_extent, extent; void *tmp_buf=NULL, *target_buf; const void *source_buf; if (origin_datatype != target_datatype) { /* first copy the data into a temporary buffer with the same datatype as the target. Then do the accumulate operation. */ MPIR_Type_get_true_extent_impl(target_datatype, &true_lb, &true_extent); MPID_Datatype_get_extent_macro(target_datatype, extent); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, target_count * (MPIR_MAX(extent,true_extent)), mpi_errno, "temporary buffer"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - true_lb); mpi_errno = MPIR_Localcopy(origin_addr, origin_count, origin_datatype, tmp_buf, target_count, target_datatype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } } if (target_predefined) { /* target predefined type, origin derived datatype */ (*uop)(tmp_buf, (char *) base + disp_unit * target_disp, &target_count, &target_datatype); } else { segp = MPID_Segment_alloc(); MPIU_ERR_CHKANDJUMP1((!segp), mpi_errno, MPI_ERR_OTHER, "**nomem","**nomem %s","MPID_Segment_alloc"); MPID_Segment_init(NULL, target_count, target_datatype, segp, 0); first = 0; last = SEGMENT_IGNORE_LAST; MPID_Datatype_get_ptr(target_datatype, dtp); vec_len = dtp->max_contig_blocks * target_count + 1; /* +1 needed because Rob says so */ MPIU_CHKLMEM_MALLOC(dloop_vec, DLOOP_VECTOR *, vec_len * sizeof(DLOOP_VECTOR), mpi_errno, "dloop vector"); MPID_Segment_pack_vector(segp, first, &last, dloop_vec, &vec_len); source_buf = (tmp_buf != NULL) ? tmp_buf : origin_addr; target_buf = (char *) base + disp_unit * target_disp; type = dtp->eltype; type_size = MPID_Datatype_get_basic_size(type); for (i=0; i<vec_len; i++) { count = (dloop_vec[i].DLOOP_VECTOR_LEN)/type_size; (*uop)((char *)source_buf + MPIU_PtrToAint(dloop_vec[i].DLOOP_VECTOR_BUF), (char *)target_buf + MPIU_PtrToAint(dloop_vec[i].DLOOP_VECTOR_BUF), &count, &type); } MPID_Segment_free(segp); } }
int MPIR_Iallgatherv_rec_dbl(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int displs[], MPI_Datatype recvtype, MPID_Comm *comm_ptr, MPID_Sched_t s) { int mpi_errno = MPI_SUCCESS; int comm_size, rank, i, j, k; int curr_count, send_offset, incoming_count, recv_offset; int mask, dst, total_count, position, offset, my_tree_root, dst_tree_root; MPI_Aint recvtype_extent, recvtype_true_extent, recvtype_true_lb; void *tmp_buf = NULL; int is_homogeneous ATTRIBUTE((unused)); MPIR_SCHED_CHKPMEM_DECL(1); comm_size = comm_ptr->local_size; rank = comm_ptr->rank; is_homogeneous = 1; #ifdef MPID_HAS_HETERO if (comm_ptr->is_hetero) is_homogeneous = 0; #endif MPIU_Assert(is_homogeneous); /* we only handle the homogeneous for now */ /* need to receive contiguously into tmp_buf because displs could make the recvbuf noncontiguous */ MPID_Datatype_get_extent_macro(recvtype, recvtype_extent); MPIR_Type_get_true_extent_impl(recvtype, &recvtype_true_lb, &recvtype_true_extent); total_count = 0; for (i=0; i<comm_size; i++) total_count += recvcounts[i]; if (total_count == 0) goto fn_exit; MPID_Ensure_Aint_fits_in_pointer(total_count*(MPIR_MAX(recvtype_true_extent, recvtype_extent))); MPIR_SCHED_CHKPMEM_MALLOC(tmp_buf, void *, total_count*(MPIR_MAX(recvtype_true_extent,recvtype_extent)), mpi_errno, "tmp_buf"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - recvtype_true_lb); /* copy local data into right location in tmp_buf */ position = 0; for (i=0; i<rank; i++) position += recvcounts[i]; if (sendbuf != MPI_IN_PLACE) { mpi_errno = MPID_Sched_copy(sendbuf, sendcount, sendtype, ((char *)tmp_buf + position*recvtype_extent), recvcounts[rank], recvtype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } else { /* if in_place specified, local data is found in recvbuf */ mpi_errno = MPID_Sched_copy(((char *)recvbuf + displs[rank]*recvtype_extent), recvcounts[rank], recvtype, ((char *)tmp_buf + position*recvtype_extent), recvcounts[rank], recvtype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } curr_count = recvcounts[rank]; /* never used uninitialized w/o this, but compiler can't tell that */ incoming_count = -1; /* [goodell@] random notes that help slightly when deciphering this code: * - mask is also equal to the number of blocks that we are going to recv * (less if comm_size is non-pof2) * - FOO_tree_root is the leftmost (lowest ranked) process with whom FOO has * communicated, directly or indirectly, at the beginning of round the * round. FOO is either "dst" or "my", where "my" means use my rank. * - in each round we are going to recv the blocks * B[dst_tree_root],B[dst_tree_root+1],...,B[min(dst_tree_root+mask,comm_size)] */ mask = 0x1; i = 0; while (mask < comm_size) { dst = rank ^ mask; /* find offset into send and recv buffers. zero out the least significant "i" bits of rank and dst to find root of src and dst subtrees. Use ranks of roots as index to send from and recv into buffer */ dst_tree_root = dst >> i; dst_tree_root <<= i; my_tree_root = rank >> i; my_tree_root <<= i; if (dst < comm_size) { send_offset = 0; for (j = 0; j < my_tree_root; j++) send_offset += recvcounts[j]; recv_offset = 0; for (j = 0; j < dst_tree_root; j++) recv_offset += recvcounts[j]; incoming_count = 0; for (j = dst_tree_root; j < (dst_tree_root + mask) && j < comm_size; ++j) incoming_count += recvcounts[j]; mpi_errno = MPID_Sched_send(((char *)tmp_buf + send_offset * recvtype_extent), curr_count, recvtype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); /* sendrecv, no barrier here */ mpi_errno = MPID_Sched_recv(((char *)tmp_buf + recv_offset * recvtype_extent), incoming_count, recvtype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); curr_count += incoming_count; } /* if some processes in this process's subtree in this step did not have any destination process to communicate with because of non-power-of-two, we need to send them the data that they would normally have received from those processes. That is, the haves in this subtree must send to the havenots. We use a logarithmic recursive-halfing algorithm for this. */ /* This part of the code will not currently be executed because we are not using recursive doubling for non power of two. Mark it as experimental so that it doesn't show up as red in the coverage tests. */ /* --BEGIN EXPERIMENTAL-- */ if (dst_tree_root + mask > comm_size) { int tmp_mask, tree_root; int nprocs_completed = comm_size - my_tree_root - mask; /* nprocs_completed is the number of processes in this subtree that have all the data. Send data to others in a tree fashion. First find root of current tree that is being divided into two. k is the number of least-significant bits in this process's rank that must be zeroed out to find the rank of the root */ /* [goodell@] it looks like (k==i) is always true, could possibly * skip the loop below */ j = mask; k = 0; while (j) { j >>= 1; k++; } k--; tmp_mask = mask >> 1; while (tmp_mask) { dst = rank ^ tmp_mask; tree_root = rank >> k; tree_root <<= k; /* send only if this proc has data and destination doesn't have data. at any step, multiple processes can send if they have the data */ if ((dst > rank) && (rank < tree_root + nprocs_completed) && (dst >= tree_root + nprocs_completed)) { offset = 0; for (j = 0; j < (my_tree_root+mask); j++) offset += recvcounts[j]; offset *= recvtype_extent; /* incoming_count was set in the previous receive. that's the amount of data to be sent now. */ mpi_errno = MPID_Sched_send(((char *)tmp_buf + offset), incoming_count, recvtype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); } /* recv only if this proc. doesn't have data and sender has data */ else if ((dst < rank) && (dst < tree_root + nprocs_completed) && (rank >= tree_root + nprocs_completed)) { offset = 0; for (j = 0; j < (my_tree_root+mask); j++) offset += recvcounts[j]; /* recalculate incoming_count, since not all processes will have * this value */ incoming_count = 0; for (j = dst_tree_root; j < (dst_tree_root + mask) && j < comm_size; ++j) incoming_count += recvcounts[j]; mpi_errno = MPID_Sched_recv(((char *)tmp_buf + offset * recvtype_extent), incoming_count, recvtype, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); curr_count += incoming_count; } tmp_mask >>= 1; k--; } } /* --END EXPERIMENTAL-- */ mask <<= 1; i++; }
int MPIR_Allgatherv_intra ( const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, const int *recvcounts, const int *displs, MPI_Datatype recvtype, MPID_Comm *comm_ptr, mpir_errflag_t *errflag ) { int comm_size, rank, j, i, left, right; int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; MPI_Status status; MPI_Aint recvbuf_extent, recvtype_extent, recvtype_true_extent, recvtype_true_lb; int curr_cnt, send_cnt, dst, total_count, recvtype_size, pof2, src, rem; int recv_cnt; void *tmp_buf; int mask, dst_tree_root, my_tree_root, is_homogeneous, position, send_offset, recv_offset, last_recv_cnt, nprocs_completed, k, offset, tmp_mask, tree_root; #ifdef MPID_HAS_HETERO int tmp_buf_size, nbytes; #endif MPIU_CHKLMEM_DECL(1); /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_ENTER( comm_ptr ); comm_size = comm_ptr->local_size; rank = comm_ptr->rank; total_count = 0; for (i=0; i<comm_size; i++) total_count += recvcounts[i]; if (total_count == 0) goto fn_exit; MPID_Datatype_get_extent_macro( recvtype, recvtype_extent ); MPID_Datatype_get_size_macro(recvtype, recvtype_size); if ((total_count*recvtype_size < MPIR_CVAR_ALLGATHER_LONG_MSG_SIZE) && !(comm_size & (comm_size - 1))) { /* Short or medium size message and power-of-two no. of processes. Use * recursive doubling algorithm */ is_homogeneous = 1; #ifdef MPID_HAS_HETERO if (comm_ptr->is_hetero) is_homogeneous = 0; #endif if (is_homogeneous) { /* need to receive contiguously into tmp_buf because displs could make the recvbuf noncontiguous */ MPIR_Type_get_true_extent_impl(recvtype, &recvtype_true_lb, &recvtype_true_extent); MPID_Ensure_Aint_fits_in_pointer(total_count * (MPIR_MAX(recvtype_true_extent, recvtype_extent))); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, total_count*(MPIR_MAX(recvtype_true_extent,recvtype_extent)), mpi_errno, "tmp_buf"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - recvtype_true_lb); /* copy local data into right location in tmp_buf */ position = 0; for (i=0; i<rank; i++) position += recvcounts[i]; if (sendbuf != MPI_IN_PLACE) { mpi_errno = MPIR_Localcopy(sendbuf, sendcount, sendtype, ((char *)tmp_buf + position* recvtype_extent), recvcounts[rank], recvtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } else { /* if in_place specified, local data is found in recvbuf */ mpi_errno = MPIR_Localcopy(((char *)recvbuf + displs[rank]*recvtype_extent), recvcounts[rank], recvtype, ((char *)tmp_buf + position* recvtype_extent), recvcounts[rank], recvtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } curr_cnt = recvcounts[rank]; mask = 0x1; i = 0; while (mask < comm_size) { dst = rank ^ mask; /* find offset into send and recv buffers. zero out the least significant "i" bits of rank and dst to find root of src and dst subtrees. Use ranks of roots as index to send from and recv into buffer */ dst_tree_root = dst >> i; dst_tree_root <<= i; my_tree_root = rank >> i; my_tree_root <<= i; if (dst < comm_size) { send_offset = 0; for (j=0; j<my_tree_root; j++) send_offset += recvcounts[j]; recv_offset = 0; for (j=0; j<dst_tree_root; j++) recv_offset += recvcounts[j]; mpi_errno = MPIC_Sendrecv(((char *)tmp_buf + send_offset * recvtype_extent), curr_cnt, recvtype, dst, MPIR_ALLGATHERV_TAG, ((char *)tmp_buf + recv_offset * recvtype_extent), total_count - recv_offset, recvtype, dst, MPIR_ALLGATHERV_TAG, comm_ptr, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = MPIR_ERR_GET_CLASS(mpi_errno); MPIU_ERR_SET(mpi_errno, *errflag, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); last_recv_cnt = 0; } else /* for convenience, recv is posted for a bigger amount than will be sent */ MPIR_Get_count_impl(&status, recvtype, &last_recv_cnt); curr_cnt += last_recv_cnt; } /* if some processes in this process's subtree in this step did not have any destination process to communicate with because of non-power-of-two, we need to send them the data that they would normally have received from those processes. That is, the haves in this subtree must send to the havenots. We use a logarithmic recursive-halfing algorithm for this. */ /* This part of the code will not currently be executed because we are not using recursive doubling for non power of two. Mark it as experimental so that it doesn't show up as red in the coverage tests. */ /* --BEGIN EXPERIMENTAL-- */ if (dst_tree_root + mask > comm_size) { nprocs_completed = comm_size - my_tree_root - mask; /* nprocs_completed is the number of processes in this subtree that have all the data. Send data to others in a tree fashion. First find root of current tree that is being divided into two. k is the number of least-significant bits in this process's rank that must be zeroed out to find the rank of the root */ j = mask; k = 0; while (j) { j >>= 1; k++; } k--; tmp_mask = mask >> 1; while (tmp_mask) { dst = rank ^ tmp_mask; tree_root = rank >> k; tree_root <<= k; /* send only if this proc has data and destination doesn't have data. at any step, multiple processes can send if they have the data */ if ((dst > rank) && (rank < tree_root + nprocs_completed) && (dst >= tree_root + nprocs_completed)) { offset = 0; for (j=0; j<(my_tree_root+mask); j++) offset += recvcounts[j]; offset *= recvtype_extent; mpi_errno = MPIC_Send(((char *)tmp_buf + offset), last_recv_cnt, recvtype, dst, MPIR_ALLGATHERV_TAG, comm_ptr, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = MPIR_ERR_GET_CLASS(mpi_errno); MPIU_ERR_SET(mpi_errno, *errflag, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } /* last_recv_cnt was set in the previous receive. that's the amount of data to be sent now. */ } /* recv only if this proc. doesn't have data and sender has data */ else if ((dst < rank) && (dst < tree_root + nprocs_completed) && (rank >= tree_root + nprocs_completed)) { offset = 0; for (j=0; j<(my_tree_root+mask); j++) offset += recvcounts[j]; mpi_errno = MPIC_Recv(((char *)tmp_buf + offset * recvtype_extent), total_count - offset, recvtype, dst, MPIR_ALLGATHERV_TAG, comm_ptr, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = MPIR_ERR_GET_CLASS(mpi_errno); MPIU_ERR_SET(mpi_errno, *errflag, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); last_recv_cnt = 0; } else /* for convenience, recv is posted for a bigger amount than will be sent */ MPIR_Get_count_impl(&status, recvtype, &last_recv_cnt); curr_cnt += last_recv_cnt; } tmp_mask >>= 1; k--; } } /* --END EXPERIMENTAL-- */ mask <<= 1; i++; } /* copy data from tmp_buf to recvbuf */ position = 0; for (j=0; j<comm_size; j++) { if ((sendbuf != MPI_IN_PLACE) || (j != rank)) { /* not necessary to copy if in_place and j==rank. otherwise copy. */ mpi_errno = MPIR_Localcopy(((char *)tmp_buf + position*recvtype_extent), recvcounts[j], recvtype, ((char *)recvbuf + displs[j]*recvtype_extent), recvcounts[j], recvtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } position += recvcounts[j]; } }
int MPIR_Bsend_attach( void *buffer, int buffer_size ) { MPIR_Bsend_data_t *p; size_t offset, align_sz; # ifdef HAVE_ERROR_CHECKING { MPID_BEGIN_ERROR_CHECKS; { if (BsendBuffer.buffer) { return MPIR_Err_create_code( MPI_SUCCESS, MPIR_ERR_RECOVERABLE, "MPIR_Bsend_attach", __LINE__, MPI_ERR_BUFFER, "**bufexists", 0 ); } if (buffer_size < MPI_BSEND_OVERHEAD) { /* MPI_ERR_OTHER is another valid choice for this error, but the Intel test wants MPI_ERR_BUFFER, and it seems to violate the principle of least surprise to not use MPI_ERR_BUFFER for errors with the Buffer */ return MPIR_Err_create_code( MPI_SUCCESS, MPIR_ERR_RECOVERABLE, "MPIR_Bsend_attach", __LINE__, MPI_ERR_BUFFER, "**bsendbufsmall", "**bsendbufsmall %d %d", buffer_size, MPI_BSEND_OVERHEAD ); } } MPID_END_ERROR_CHECKS; } # endif /* HAVE_ERROR_CHECKING */ if (!initialized) { initialized = 1; MPIR_Add_finalize( MPIR_Bsend_finalize, (void *)0, 10 ); } BsendBuffer.origbuffer = buffer; BsendBuffer.origbuffer_size = buffer_size; BsendBuffer.buffer = buffer; BsendBuffer.buffer_size = buffer_size; /* Make sure that the buffer that we use is aligned to align_sz. Some other code assumes pointer-alignment, and some code assumes double alignment. Further, GCC 4.5.1 generates bad code on 32-bit platforms when this is only 4-byte aligned (see #1149). */ align_sz = MPIR_MAX(sizeof(void *), sizeof(double)); offset = ((size_t)buffer) % align_sz; if (offset) { offset = align_sz - offset; buffer = (char *)buffer + offset; BsendBuffer.buffer = buffer; BsendBuffer.buffer_size -= offset; } BsendBuffer.avail = buffer; BsendBuffer.pending = 0; BsendBuffer.active = 0; /* Set the first block */ p = (MPIR_Bsend_data_t *)buffer; p->size = buffer_size - BSENDDATA_HEADER_TRUE_SIZE; p->total_size = buffer_size; p->next = p->prev = NULL; p->msg.msgbuf = (char *)p + BSENDDATA_HEADER_TRUE_SIZE; return MPI_SUCCESS; }
int MPIDI_Accumulate(void *origin_addr, int origin_count, MPI_Datatype origin_datatype, int target_rank, MPI_Aint target_disp, int target_count, MPI_Datatype target_datatype, MPI_Op op, MPID_Win *win_ptr) { int mpi_errno=MPI_SUCCESS; MPIDI_msg_sz_t data_sz; int dt_contig, rank, origin_predefined, target_predefined; MPI_Aint dt_true_lb; MPIDI_RMA_ops *new_ptr; MPID_Datatype *dtp; MPIU_CHKLMEM_DECL(2); MPIU_CHKPMEM_DECL(1); MPIDI_STATE_DECL(MPID_STATE_MPIDI_ACCUMULATE); MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_ACCUMULATE); MPIDI_Datatype_get_info(origin_count, origin_datatype, dt_contig, data_sz, dtp, dt_true_lb); if ((data_sz == 0) || (target_rank == MPI_PROC_NULL)) { goto fn_exit; } rank = win_ptr->myrank; MPIDI_CH3I_DATATYPE_IS_PREDEFINED(origin_datatype, origin_predefined); MPIDI_CH3I_DATATYPE_IS_PREDEFINED(target_datatype, target_predefined); /* Do =! rank first (most likely branch?) */ if (target_rank == rank) { MPI_User_function *uop; if (op == MPI_REPLACE) { mpi_errno = MPIR_Localcopy(origin_addr, origin_count, origin_datatype, (char *) win_ptr->base + win_ptr->disp_unit * target_disp, target_count, target_datatype); goto fn_exit; } MPIU_ERR_CHKANDJUMP1((HANDLE_GET_KIND(op) != HANDLE_KIND_BUILTIN), mpi_errno, MPI_ERR_OP, "**opnotpredefined", "**opnotpredefined %d", op ); /* get the function by indexing into the op table */ uop = MPIR_Op_table[((op)&0xf) - 1]; if (origin_predefined && target_predefined) { (*uop)(origin_addr, (char *) win_ptr->base + win_ptr->disp_unit * target_disp, &target_count, &target_datatype); } else { /* derived datatype */ MPID_Segment *segp; DLOOP_VECTOR *dloop_vec; MPI_Aint first, last; int vec_len, i, type_size, count; MPI_Datatype type; MPI_Aint true_lb, true_extent, extent; void *tmp_buf=NULL, *source_buf, *target_buf; if (origin_datatype != target_datatype) { /* first copy the data into a temporary buffer with the same datatype as the target. Then do the accumulate operation. */ MPIR_Type_get_true_extent_impl(target_datatype, &true_lb, &true_extent); MPID_Datatype_get_extent_macro(target_datatype, extent); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, target_count * (MPIR_MAX(extent,true_extent)), mpi_errno, "temporary buffer"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - true_lb); mpi_errno = MPIR_Localcopy(origin_addr, origin_count, origin_datatype, tmp_buf, target_count, target_datatype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } } if (target_predefined) { /* target predefined type, origin derived datatype */ (*uop)(tmp_buf, (char *) win_ptr->base + win_ptr->disp_unit * target_disp, &target_count, &target_datatype); } else { segp = MPID_Segment_alloc(); MPIU_ERR_CHKANDJUMP1((!segp), mpi_errno, MPI_ERR_OTHER, "**nomem","**nomem %s","MPID_Segment_alloc"); MPID_Segment_init(NULL, target_count, target_datatype, segp, 0); first = 0; last = SEGMENT_IGNORE_LAST; MPID_Datatype_get_ptr(target_datatype, dtp); vec_len = dtp->max_contig_blocks * target_count + 1; /* +1 needed because Rob says so */ MPIU_CHKLMEM_MALLOC(dloop_vec, DLOOP_VECTOR *, vec_len * sizeof(DLOOP_VECTOR), mpi_errno, "dloop vector"); MPID_Segment_pack_vector(segp, first, &last, dloop_vec, &vec_len); source_buf = (tmp_buf != NULL) ? tmp_buf : origin_addr; target_buf = (char *) win_ptr->base + win_ptr->disp_unit * target_disp; type = dtp->eltype; type_size = MPID_Datatype_get_basic_size(type); for (i=0; i<vec_len; i++) { count = (dloop_vec[i].DLOOP_VECTOR_LEN)/type_size; (*uop)((char *)source_buf + MPIU_PtrToAint(dloop_vec[i].DLOOP_VECTOR_BUF), (char *)target_buf + MPIU_PtrToAint(dloop_vec[i].DLOOP_VECTOR_BUF), &count, &type); } MPID_Segment_free(segp); } }
void MPICH_DEFAULT_MAXF(void *invec, void *inoutvec, int *Len, MPI_Datatype *type) { int i, len = *Len; switch (*type) { case MPIR_INT:{ int *a = (int *) inoutvec; int *b = (int *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_UINT:{ unsigned int *a = (unsigned int *) inoutvec; unsigned int *b = (unsigned int *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_LONG:{ long *a = (long *) inoutvec; long *b = (long *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } #if defined(HAVE_LONG_LONG_INT) case MPIR_LONGLONGINT:{ long long *a = (long long *) inoutvec; long long *b = (long long *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } #endif case MPIR_ULONG:{ unsigned long *a = (unsigned long *) inoutvec; unsigned long *b = (unsigned long *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_SHORT:{ short *a = (short *) inoutvec; short *b = (short *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_USHORT:{ unsigned short *a = (unsigned short *) inoutvec; unsigned short *b = (unsigned short *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_CHAR:{ char *a = (char *) inoutvec; char *b = (char *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_UCHAR: case MPIR_BYTE:{ unsigned char *a = (unsigned char *) inoutvec; unsigned char *b = (unsigned char *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_FLOAT:{ float *a = (float *) inoutvec; float *b = (float *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } case MPIR_DOUBLE:{ double *a = (double *) inoutvec; double *b = (double *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } #if defined(HAVE_LONG_DOUBLE) case MPIR_LONGDOUBLE:{ long double *a = (long double *) inoutvec; long double *b = (long double *) invec; for (i = 0; i < len; i++) a[i] = MPIR_MAX(a[i], b[i]); break; } #endif default: MPIR_Op_errno = MPIR_ERR_OP_NOT_DEFINED; MPIR_ERROR(MPIR_COMM_WORLD, MPIR_ERR_OP_NOT_DEFINED, "MPI_MAX"); break; } }
int MPIR_Ialltoall_bruck(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPID_Comm *comm_ptr, MPID_Sched_t s) { int mpi_errno = MPI_SUCCESS; int i; int nbytes, recvtype_size, recvbuf_extent, newtype_size; int rank, comm_size; void *tmp_buf = NULL; MPI_Aint sendtype_extent, recvtype_extent, recvtype_true_lb, recvtype_true_extent; int pof2, dst, src; int count, block; MPI_Datatype newtype; int *displs; MPIU_CHKLMEM_DECL(1); /* displs */ MPIR_SCHED_CHKPMEM_DECL(2); /* tmp_buf (2x) */ MPIU_Assert(sendbuf != MPI_IN_PLACE); /* we do not handle in-place */ comm_size = comm_ptr->local_size; rank = comm_ptr->rank; MPID_Datatype_get_extent_macro(sendtype, sendtype_extent); MPID_Datatype_get_size_macro(recvtype, recvtype_size); MPID_Datatype_get_extent_macro(recvtype, recvtype_extent); /* allocate temporary buffer */ /* must be same size as entire recvbuf for Phase 3 */ nbytes = recvtype_size * recvcount * comm_size; MPIR_SCHED_CHKPMEM_MALLOC(tmp_buf, void *, nbytes, mpi_errno, "tmp_buf"); /* Do Phase 1 of the algorithim. Shift the data blocks on process i * upwards by a distance of i blocks. Store the result in recvbuf. */ mpi_errno = MPID_Sched_copy(((char *) sendbuf + rank*sendcount*sendtype_extent), (comm_size - rank)*sendcount, sendtype, recvbuf, (comm_size - rank)*recvcount, recvtype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPID_Sched_copy(sendbuf, rank*sendcount, sendtype, ((char *) recvbuf + (comm_size-rank)*recvcount*recvtype_extent), rank*recvcount, recvtype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* Input data is now stored in recvbuf with datatype recvtype */ /* Now do Phase 2, the communication phase. It takes ceiling(lg p) steps. In each step i, each process sends to rank+2^i and receives from rank-2^i, and exchanges all data blocks whose ith bit is 1. */ /* allocate displacements array for indexed datatype used in communication */ MPIU_CHKLMEM_MALLOC(displs, int *, comm_size * sizeof(int), mpi_errno, "displs"); pof2 = 1; while (pof2 < comm_size) { dst = (rank + pof2) % comm_size; src = (rank - pof2 + comm_size) % comm_size; /* Exchange all data blocks whose ith bit is 1 */ /* Create an indexed datatype for the purpose */ count = 0; for (block=1; block<comm_size; block++) { if (block & pof2) { displs[count] = block * recvcount; count++; } } mpi_errno = MPIR_Type_create_indexed_block_impl(count, recvcount, displs, recvtype, &newtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPIR_Type_commit_impl(&newtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_Datatype_get_size_macro(newtype, newtype_size); /* we will usually copy much less than nbytes */ mpi_errno = MPID_Sched_copy(recvbuf, 1, newtype, tmp_buf, newtype_size, MPI_BYTE, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* now send and recv in parallel */ mpi_errno = MPID_Sched_send(tmp_buf, newtype_size, MPI_BYTE, dst, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPID_Sched_recv(recvbuf, 1, newtype, src, comm_ptr, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); MPIR_Type_free_impl(&newtype); pof2 *= 2; } /* Phase 3: Rotate blocks in recvbuf upwards by (rank + 1) blocks. Need * a temporary buffer of the same size as recvbuf. */ /* get true extent of recvtype */ MPIR_Type_get_true_extent_impl(recvtype, &recvtype_true_lb, &recvtype_true_extent); recvbuf_extent = recvcount * comm_size * (MPIR_MAX(recvtype_true_extent, recvtype_extent)); /* not a leak, old tmp_buf value is still tracked by CHKPMEM macros */ MPIR_SCHED_CHKPMEM_MALLOC(tmp_buf, void *, recvbuf_extent, mpi_errno, "tmp_buf"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - recvtype_true_lb); mpi_errno = MPID_Sched_copy(((char *) recvbuf + (rank+1)*recvcount*recvtype_extent), (comm_size - rank - 1)*recvcount, recvtype, tmp_buf, (comm_size - rank - 1)*recvcount, recvtype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPID_Sched_copy(recvbuf, (rank+1)*recvcount, recvtype, ((char *) tmp_buf + (comm_size-rank-1)*recvcount*recvtype_extent), (rank+1)*recvcount, recvtype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); MPID_SCHED_BARRIER(s); /* Blocks are in the reverse order now (comm_size-1 to 0). * Reorder them to (0 to comm_size-1) and store them in recvbuf. */ for (i = 0; i < comm_size; i++){ mpi_errno = MPID_Sched_copy(((char *) tmp_buf + i*recvcount*recvtype_extent), recvcount, recvtype, ((char *) recvbuf + (comm_size-i-1)*recvcount*recvtype_extent), recvcount, recvtype, s); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } MPIR_SCHED_CHKPMEM_COMMIT(s); fn_exit: MPIU_CHKLMEM_FREEALL(); return mpi_errno; fn_fail: MPIR_SCHED_CHKPMEM_REAP(s); goto fn_exit; }
int MPIR_Alltoall_intra( const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPID_Comm *comm_ptr, int *errflag ) { int comm_size, i, j, pof2; MPI_Aint sendtype_extent, recvtype_extent; MPI_Aint recvtype_true_extent, recvbuf_extent, recvtype_true_lb; int mpi_errno=MPI_SUCCESS, src, dst, rank, nbytes; int mpi_errno_ret = MPI_SUCCESS; MPI_Status status; int sendtype_size, pack_size, block, position, *displs, count; MPI_Datatype newtype = MPI_DATATYPE_NULL; void *tmp_buf; MPI_Comm comm; MPI_Request *reqarray; MPI_Status *starray; MPIU_CHKLMEM_DECL(6); #ifdef MPIR_OLD_SHORT_ALLTOALL_ALG MPI_Aint sendtype_true_extent, sendbuf_extent, sendtype_true_lb; int k, p, curr_cnt, dst_tree_root, my_tree_root; int last_recv_cnt, mask, tmp_mask, tree_root, nprocs_completed; #endif if (recvcount == 0) return MPI_SUCCESS; comm = comm_ptr->handle; comm_size = comm_ptr->local_size; rank = comm_ptr->rank; /* Get extent of send and recv types */ MPID_Datatype_get_extent_macro(recvtype, recvtype_extent); MPID_Datatype_get_extent_macro(sendtype, sendtype_extent); MPID_Datatype_get_size_macro(sendtype, sendtype_size); nbytes = sendtype_size * sendcount; /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_ENTER( comm_ptr ); if (sendbuf == MPI_IN_PLACE) { /* We use pair-wise sendrecv_replace in order to conserve memory usage, * which is keeping with the spirit of the MPI-2.2 Standard. But * because of this approach all processes must agree on the global * schedule of sendrecv_replace operations to avoid deadlock. * * Note that this is not an especially efficient algorithm in terms of * time and there will be multiple repeated malloc/free's rather than * maintaining a single buffer across the whole loop. Something like * MADRE is probably the best solution for the MPI_IN_PLACE scenario. */ for (i = 0; i < comm_size; ++i) { /* start inner loop at i to avoid re-exchanging data */ for (j = i; j < comm_size; ++j) { if (rank == i) { /* also covers the (rank == i && rank == j) case */ mpi_errno = MPIC_Sendrecv_replace_ft(((char *)recvbuf + j*recvcount*recvtype_extent), recvcount, recvtype, j, MPIR_ALLTOALL_TAG, j, MPIR_ALLTOALL_TAG, comm, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } else if (rank == j) { /* same as above with i/j args reversed */ mpi_errno = MPIC_Sendrecv_replace_ft(((char *)recvbuf + i*recvcount*recvtype_extent), recvcount, recvtype, i, MPIR_ALLTOALL_TAG, i, MPIR_ALLTOALL_TAG, comm, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } } } } else if ((nbytes <= MPIR_PARAM_ALLTOALL_SHORT_MSG_SIZE) && (comm_size >= 8)) { /* use the indexing algorithm by Jehoshua Bruck et al, * IEEE TPDS, Nov. 97 */ /* allocate temporary buffer */ MPIR_Pack_size_impl(recvcount*comm_size, recvtype, &pack_size); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, pack_size, mpi_errno, "tmp_buf"); /* Do Phase 1 of the algorithim. Shift the data blocks on process i * upwards by a distance of i blocks. Store the result in recvbuf. */ mpi_errno = MPIR_Localcopy((char *) sendbuf + rank*sendcount*sendtype_extent, (comm_size - rank)*sendcount, sendtype, recvbuf, (comm_size - rank)*recvcount, recvtype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } mpi_errno = MPIR_Localcopy(sendbuf, rank*sendcount, sendtype, (char *) recvbuf + (comm_size-rank)*recvcount*recvtype_extent, rank*recvcount, recvtype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } /* Input data is now stored in recvbuf with datatype recvtype */ /* Now do Phase 2, the communication phase. It takes ceiling(lg p) steps. In each step i, each process sends to rank+2^i and receives from rank-2^i, and exchanges all data blocks whose ith bit is 1. */ /* allocate displacements array for indexed datatype used in communication */ MPIU_CHKLMEM_MALLOC(displs, int *, comm_size * sizeof(int), mpi_errno, "displs"); pof2 = 1; while (pof2 < comm_size) { dst = (rank + pof2) % comm_size; src = (rank - pof2 + comm_size) % comm_size; /* Exchange all data blocks whose ith bit is 1 */ /* Create an indexed datatype for the purpose */ count = 0; for (block=1; block<comm_size; block++) { if (block & pof2) { displs[count] = block * recvcount; count++; } } mpi_errno = MPIR_Type_create_indexed_block_impl(count, recvcount, displs, recvtype, &newtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPIR_Type_commit_impl(&newtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); position = 0; mpi_errno = MPIR_Pack_impl(recvbuf, 1, newtype, tmp_buf, pack_size, &position); if (mpi_errno) MPIU_ERR_POP(mpi_errno); mpi_errno = MPIC_Sendrecv_ft(tmp_buf, position, MPI_PACKED, dst, MPIR_ALLTOALL_TAG, recvbuf, 1, newtype, src, MPIR_ALLTOALL_TAG, comm, MPI_STATUS_IGNORE, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } MPIR_Type_free_impl(&newtype); pof2 *= 2; } /* Rotate blocks in recvbuf upwards by (rank + 1) blocks. Need * a temporary buffer of the same size as recvbuf. */ /* get true extent of recvtype */ MPIR_Type_get_true_extent_impl(recvtype, &recvtype_true_lb, &recvtype_true_extent); recvbuf_extent = recvcount * comm_size * (MPIR_MAX(recvtype_true_extent, recvtype_extent)); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, recvbuf_extent, mpi_errno, "tmp_buf"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - recvtype_true_lb); mpi_errno = MPIR_Localcopy((char *) recvbuf + (rank+1)*recvcount*recvtype_extent, (comm_size - rank - 1)*recvcount, recvtype, tmp_buf, (comm_size - rank - 1)*recvcount, recvtype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } mpi_errno = MPIR_Localcopy(recvbuf, (rank+1)*recvcount, recvtype, (char *) tmp_buf + (comm_size-rank-1)*recvcount*recvtype_extent, (rank+1)*recvcount, recvtype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } /* Blocks are in the reverse order now (comm_size-1 to 0). * Reorder them to (0 to comm_size-1) and store them in recvbuf. */ for (i=0; i<comm_size; i++){ mpi_errno = MPIR_Localcopy((char *) tmp_buf + i*recvcount*recvtype_extent, recvcount, recvtype, (char *) recvbuf + (comm_size-i-1)*recvcount*recvtype_extent, recvcount, recvtype); if (mpi_errno) MPIU_ERR_POP(mpi_errno); } #ifdef MPIR_OLD_SHORT_ALLTOALL_ALG /* Short message. Use recursive doubling. Each process sends all its data at each step along with all data it received in previous steps. */ /* need to allocate temporary buffer of size sendbuf_extent*comm_size */ /* get true extent of sendtype */ MPIR_Type_get_true_extent_impl(sendtype, &sendtype_true_lb, &sendtype_true_extent); sendbuf_extent = sendcount * comm_size * (MPIR_MAX(sendtype_true_extent, sendtype_extent)); MPIU_CHKLMEM_MALLOC(tmp_buf, void *, sendbuf_extent*comm_size, mpi_errno, "tmp_buf"); /* adjust for potential negative lower bound in datatype */ tmp_buf = (void *)((char*)tmp_buf - sendtype_true_lb); /* copy local sendbuf into tmp_buf at location indexed by rank */ curr_cnt = sendcount*comm_size; mpi_errno = MPIR_Localcopy(sendbuf, curr_cnt, sendtype, ((char *)tmp_buf + rank*sendbuf_extent), curr_cnt, sendtype); if (mpi_errno) { MPIU_ERR_POP(mpi_errno);} mask = 0x1; i = 0; while (mask < comm_size) { dst = rank ^ mask; dst_tree_root = dst >> i; dst_tree_root <<= i; my_tree_root = rank >> i; my_tree_root <<= i; if (dst < comm_size) { mpi_errno = MPIC_Sendrecv_ft(((char *)tmp_buf + my_tree_root*sendbuf_extent), curr_cnt, sendtype, dst, MPIR_ALLTOALL_TAG, ((char *)tmp_buf + dst_tree_root*sendbuf_extent), sendbuf_extent*(comm_size-dst_tree_root), sendtype, dst, MPIR_ALLTOALL_TAG, comm, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); last_recv_cnt = 0; } else /* in case of non-power-of-two nodes, less data may be received than specified */ MPIR_Get_count_impl(&status, sendtype, &last_recv_cnt); curr_cnt += last_recv_cnt; } /* if some processes in this process's subtree in this step did not have any destination process to communicate with because of non-power-of-two, we need to send them the result. We use a logarithmic recursive-halfing algorithm for this. */ if (dst_tree_root + mask > comm_size) { nprocs_completed = comm_size - my_tree_root - mask; /* nprocs_completed is the number of processes in this subtree that have all the data. Send data to others in a tree fashion. First find root of current tree that is being divided into two. k is the number of least-significant bits in this process's rank that must be zeroed out to find the rank of the root */ j = mask; k = 0; while (j) { j >>= 1; k++; } k--; tmp_mask = mask >> 1; while (tmp_mask) { dst = rank ^ tmp_mask; tree_root = rank >> k; tree_root <<= k; /* send only if this proc has data and destination doesn't have data. at any step, multiple processes can send if they have the data */ if ((dst > rank) && (rank < tree_root + nprocs_completed) && (dst >= tree_root + nprocs_completed)) { /* send the data received in this step above */ mpi_errno = MPIC_Send_ft(((char *)tmp_buf + dst_tree_root*sendbuf_extent), last_recv_cnt, sendtype, dst, MPIR_ALLTOALL_TAG, comm, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } /* recv only if this proc. doesn't have data and sender has data */ else if ((dst < rank) && (dst < tree_root + nprocs_completed) && (rank >= tree_root + nprocs_completed)) { mpi_errno = MPIC_Recv_ft(((char *)tmp_buf + dst_tree_root*sendbuf_extent), sendbuf_extent*(comm_size-dst_tree_root), sendtype, dst, MPIR_ALLTOALL_TAG, comm, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); last_recv_cnt = 0; } else MPIR_Get_count_impl(&status, sendtype, &last_recv_cnt); curr_cnt += last_recv_cnt; } tmp_mask >>= 1; k--; } } mask <<= 1; i++; }
int MPIR_Alltoallw_inter(const void *sendbuf, const int sendcounts[], const int sdispls[], const MPI_Datatype sendtypes[], void *recvbuf, const int recvcounts[], const int rdispls[], const MPI_Datatype recvtypes[], MPID_Comm *comm_ptr, int *errflag) { /* Intercommunicator alltoallw. We use a pairwise exchange algorithm similar to the one used in intracommunicator alltoallw. Since the local and remote groups can be of different sizes, we first compute the max of local_group_size, remote_group_size. At step i, 0 <= i < max_size, each process receives from src = (rank - i + max_size) % max_size if src < remote_size, and sends to dst = (rank + i) % max_size if dst < remote_size. FIXME: change algorithm to match intracommunicator alltoallv */ int local_size, remote_size, max_size, i; int mpi_errno = MPI_SUCCESS; int mpi_errno_ret = MPI_SUCCESS; MPI_Status status; int src, dst, rank, sendcount, recvcount; char *sendaddr, *recvaddr; MPI_Datatype sendtype, recvtype; MPI_Comm comm; local_size = comm_ptr->local_size; remote_size = comm_ptr->remote_size; comm = comm_ptr->handle; rank = comm_ptr->rank; /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_ENTER( comm_ptr ); /* Use pairwise exchange algorithm. */ max_size = MPIR_MAX(local_size, remote_size); for (i=0; i<max_size; i++) { src = (rank - i + max_size) % max_size; dst = (rank + i) % max_size; if (src >= remote_size) { src = MPI_PROC_NULL; recvaddr = NULL; recvcount = 0; recvtype = MPI_DATATYPE_NULL; } else { recvaddr = (char *)recvbuf + rdispls[src]; recvcount = recvcounts[src]; recvtype = recvtypes[src]; } if (dst >= remote_size) { dst = MPI_PROC_NULL; sendaddr = NULL; sendcount = 0; sendtype = MPI_DATATYPE_NULL; } else { sendaddr = (char *)sendbuf+sdispls[dst]; sendcount = sendcounts[dst]; sendtype = sendtypes[dst]; } mpi_errno = MPIC_Sendrecv(sendaddr, sendcount, sendtype, dst, MPIR_ALLTOALLW_TAG, recvaddr, recvcount, recvtype, src, MPIR_ALLTOALLW_TAG, comm, &status, errflag); if (mpi_errno) { /* for communication errors, just record the error but continue */ *errflag = TRUE; MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**fail"); MPIU_ERR_ADD(mpi_errno_ret, mpi_errno); } } fn_exit: /* check if multiple threads are calling this collective function */ MPIDU_ERR_CHECK_MULTIPLE_THREADS_EXIT( comm_ptr ); if (mpi_errno_ret) mpi_errno = mpi_errno_ret; else if (*errflag) MPIU_ERR_SET(mpi_errno, MPI_ERR_OTHER, "**coll_fail"); return mpi_errno; fn_fail: goto fn_exit; }