int tMPI_Barrier(tMPI_Comm comm)
{
#ifdef TMPI_PROFILE
struct tmpi_thread *cur=tMPI_Get_current();
tMPI_Profile_count_start(cur);
#endif
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Barrier(%p, %d, %p, %d, %d, %p, %p)", comm);
#endif
if (!comm)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
}
if (comm->grp.N>1)
{
#if defined(TMPI_PROFILE)
tMPI_Profile_wait_start(cur);
#endif
tMPI_Barrier_wait( &(comm->barrier) );
#if defined(TMPI_PROFILE)
tMPI_Profile_wait_stop(cur, TMPIWAIT_Barrier);
#endif
}
#ifdef TMPI_PROFILE
tMPI_Profile_count_stop(cur, TMPIFN_Barrier);
#endif
return TMPI_SUCCESS;
}
int tMPI_Cart_get(tMPI_Comm comm, int maxdims, int *dims, int *periods,
int *coords)
{
int i;
int myrank=tMPI_Comm_seek_rank(comm, tMPI_Get_current());
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Cart_get(%p, %d, %p, %p, %p)", comm, maxdims,
dims, periods, coords);
#endif
if (!comm)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
}
if (!comm->cart || comm->cart->ndims==0)
return TMPI_SUCCESS;
tMPI_Cart_coords(comm, myrank, maxdims, coords);
for(i=0;i<comm->cart->ndims;i++)
{
if (i>=maxdims)
{
return tMPI_Error(comm, TMPI_ERR_DIMS);
}
dims[i]=comm->cart->dims[i];
periods[i]=comm->cart->periods[i];
}
return TMPI_SUCCESS;
}
/* once */
int tMPI_Once(tMPI_Comm comm, void (*function)(void*), void *param,
int *was_first)
{
int myrank;
int ret=TMPI_SUCCESS;
struct coll_sync *csync;
struct coll_env *cev;
int syncs;
if (!comm)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
}
myrank=tMPI_Comm_seek_rank(comm, tMPI_Get_current());
/* we increase our counter, and determine which coll_env we get */
csync=&(comm->csync[myrank]);
csync->syncs++;
cev=&(comm->cev[csync->syncs % N_COLL_ENV]);
/* now do a compare-and-swap on the current_syncc */
syncs=tMPI_Atomic_get( &(cev->coll.current_sync));
if ((csync->syncs - syncs > 0) && /* check if sync was an earlier number.
If it is a later number, we can't
have been the first to arrive here. */
tMPI_Atomic_cas(&(cev->coll.current_sync), syncs, csync->syncs))
{
/* we're the first! */
function(param);
if (was_first)
*was_first=TRUE;
}
return ret;
}
/* get a pointer the next coll_env once it's ready. */
struct coll_env *tMPI_Get_cev(tMPI_Comm comm, int myrank, int *counter)
{
struct coll_sync *csync=&(comm->csync[myrank]);
struct coll_env *cev;
#ifdef USE_COLLECTIVE_COPY_BUFFER
int N;
#endif
/* we increase our counter, and determine which coll_env we get */
csync->synct++;
*counter=csync->synct;
cev=&(comm->cev[csync->synct % N_COLL_ENV]);
#ifdef USE_COLLECTIVE_COPY_BUFFER
if (cev->met[myrank].using_cb)
{
N=tMPI_Event_wait( &(cev->met[myrank].send_ev));
tMPI_Event_process( &(cev->met[myrank].send_ev), 1);
}
#endif
#ifdef USE_COLLECTIVE_COPY_BUFFER
/* clean up old copy_buffer pointers */
if (cev->met[myrank].cb)
{
tMPI_Copy_buffer_list_return(&(tMPI_Get_current()->cbl_multi),
cev->met[myrank].cb);
cev->met[myrank].cb=NULL;
cev->met[myrank].using_cb=FALSE;
}
#endif
return cev;
}
int tMPI_Comm_dup(tMPI_Comm comm, tMPI_Comm *newcomm)
{
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Comm_dup(%p, %p)", comm, newcomm);
#endif
/* we just call Comm_split because it already contains all the
neccesary synchronization constructs. */
return tMPI_Comm_split(comm, 0, tMPI_Comm_seek_rank(comm,
tMPI_Get_current()), newcomm);
}
tmpi_bool tMPI_Is_master(void)
{
/* if there are no other threads, we're the main thread */
if ( (!TMPI_COMM_WORLD) || TMPI_COMM_WORLD->grp.N==0)
return TRUE;
/* otherwise we know this through thread specific data: */
/* whether the thread pointer points to the head of the threads array */
return (tmpi_bool)(tMPI_Get_current() == threads);
}
int tMPI_Cart_create(tMPI_Comm comm_old, int ndims, int *dims, int *periods,
int reorder, tMPI_Comm *comm_cart)
{
int myrank = tMPI_Comm_seek_rank(comm_old, tMPI_Get_current());
int key = myrank;
int color = 0;
int Ntot = 1;
int i;
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Cart_create(%p, %d, %p, %p, %d, %p)", comm_old,
ndims, dims, periods, reorder, comm_cart);
#endif
if (!comm_old)
{
return tMPI_Error(comm_old, TMPI_ERR_COMM);
}
/* calculate the total number of procs in cartesian comm */
for (i = 0; i < ndims; i++)
{
Ntot *= dims[i];
}
/* refuse to create if there's not enough procs */
if (comm_old->grp.N < Ntot)
{
*comm_cart = TMPI_COMM_NULL;
#if 1
return tMPI_Error(comm_old, TMPI_ERR_CART_CREATE_NPROCS);
#endif
}
if (key >= Ntot)
{
key = TMPI_UNDEFINED;
}
if (reorder)
{
tMPI_Cart_map(comm_old, ndims, dims, periods, &key);
}
if (key == TMPI_UNDEFINED)
{
color = TMPI_UNDEFINED;
}
tMPI_Comm_split(comm_old, color, key, comm_cart);
tMPI_Cart_init(comm_cart, ndims, dims, periods);
return TMPI_SUCCESS;
}
int tMPI_Get_processor_name(char *name, int *resultlen)
{
int nr=tMPI_Threadnr(tMPI_Get_current());
unsigned int digits=0;
const unsigned int base=10;
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Get_processor_name(%p, %p)", name, resultlen);
#endif
/* we don't want to call sprintf here (it turns out to be not entirely
thread-safe on Mac OS X, for example), so we do it our own way: */
/* first determine number of digits */
{
int rest=nr;
while(rest > 0)
{
rest /= base;
digits++;
}
if (digits==0)
digits=1;
}
#if ! (defined( _WIN32 ) || defined( _WIN64 ) )
strcpy(name, "thread #");
#else
strncpy_s(name, TMPI_MAX_PROCESSOR_NAME, "thread #", TMPI_MAX_PROCESSOR_NAME);
#endif
/* now construct the number */
{
size_t len=strlen(name);
unsigned int i;
int rest=nr;
for(i=0;i<digits;i++)
{
size_t pos=len + (digits-i-1);
if (pos < (TMPI_MAX_PROCESSOR_NAME -1) )
name[ pos ]=(char)('0' + rest%base);
rest /= base;
}
if ( (digits+len) < TMPI_MAX_PROCESSOR_NAME)
name[digits + len]='\0';
else
name[TMPI_MAX_PROCESSOR_NAME]='\0';
}
if (resultlen)
*resultlen=(int)strlen(name); /* For some reason the MPI standard
uses ints instead of size_ts for
sizes. */
return TMPI_SUCCESS;
}
int tMPI_Comm_create(tMPI_Comm comm, tMPI_Group group, tMPI_Comm *newcomm)
{
int color = TMPI_UNDEFINED;
int key = tMPI_Comm_seek_rank(comm, tMPI_Get_current());
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Comm_create(%p, %p, %p)", comm, group, newcomm);
#endif
if (tMPI_In_group(group))
{
color = 1;
}
/* the MPI specs specifically say that this is equivalent */
return tMPI_Comm_split(comm, color, key, newcomm);
}
void tMPI_Trace_print(const char *fmt, ...)
{
va_list argp;
struct tmpi_thread* th=tMPI_Get_current();
static tMPI_Thread_mutex_t mtx=TMPI_THREAD_MUTEX_INITIALIZER;
tMPI_Thread_mutex_lock(&mtx);
if (threads)
printf("THREAD %02d: ", (int)(th-threads));
else
printf("THREAD main: ");
va_start(argp, fmt);
vprintf(fmt, argp);
printf("\n");
fflush(stdout);
va_end(argp);
tMPI_Thread_mutex_unlock(&mtx);
}
void tMPI_Wait_for_others(struct coll_env *cev, int myrank)
{
#if defined(TMPI_PROFILE)
struct tmpi_thread *cur=tMPI_Get_current();
tMPI_Profile_wait_start(cur);
#endif
#ifdef USE_COLLECTIVE_COPY_BUFFER
if (! (cev->met[myrank].using_cb) )
#endif
{
/* wait until everybody else is done copying the buffer */
tMPI_Event_wait( &(cev->met[myrank].send_ev));
tMPI_Event_process( &(cev->met[myrank].send_ev), 1);
}
#ifdef USE_COLLECTIVE_COPY_BUFFER
else
{
/* wait until everybody else is done copying the original buffer.
We use fetch_add because we want to be sure of coherency.
This wait is bound to be very short (otherwise it wouldn't
be double-buffering) so we always spin here. */
/*tMPI_Atomic_memory_barrier_rel();*/
#if 0
while (!tMPI_Atomic_cas( &(cev->met[rank].buf_readcount), 0,
-100000))
#endif
#if 0
while (tMPI_Atomic_fetch_add( &(cev->met[myrank].buf_readcount), 0)
!= 0)
#endif
#if 1
while (tMPI_Atomic_get( &(cev->met[rank].buf_readcount) )>0)
#endif
{
}
tMPI_Atomic_memory_barrier_acq();
}
#endif
#if defined(TMPI_PROFILE)
tMPI_Profile_wait_stop(cur, TMPIWAIT_Coll_send);
#endif
}
int tMPI_Cart_map(tMPI_Comm comm, int ndims, int *dims, int *periods,
int *newrank)
{
/* this function doesn't actually do anything beyond returning the current
rank (or TMPI_UNDEFINED if it doesn't fit in the new topology */
int myrank=tMPI_Comm_seek_rank(comm, tMPI_Get_current());
int Ntot=1;
int i;
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Cart_map(%p, %d, %p, %p, %p)", comm, ndims, dims,
periods, newrank);
#endif
if (!comm)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
}
if (!periods)
{
return tMPI_Error(comm, TMPI_ERR_DIMS);
}
/* calculate the total number of procs in cartesian comm */
for(i=0;i<ndims;i++)
{
Ntot *= dims[i];
}
if (myrank >= Ntot)
{
*newrank=TMPI_UNDEFINED;
}
else
{
*newrank=myrank;
}
return TMPI_SUCCESS;
}
tMPI_Comm tMPI_Get_comm_self(void)
{
struct tmpi_thread* th=tMPI_Get_current();
return th->self_comm;
}
void tMPI_Mult_recv(tMPI_Comm comm, struct coll_env *cev, int rank,
int index, int expected_tag, tMPI_Datatype recvtype,
size_t recvsize, void *recvbuf, int *ret)
{
size_t sendsize=cev->met[rank].bufsize[index];
/* check tags, types */
if ((cev->met[rank].datatype != recvtype ) ||
(cev->met[rank].tag != expected_tag))
{
*ret=tMPI_Error(comm, TMPI_ERR_MULTI_MISMATCH);
}
if (sendsize) /* we allow NULL ptrs if there's nothing to xmit */
{
void *srcbuf;
#ifdef USE_COLLECTIVE_COPY_BUFFER
tmpi_bool decrease_ctr=FALSE;
#endif
if ( sendsize > recvsize )
{
*ret=tMPI_Error(comm, TMPI_ERR_XFER_BUFSIZE);
return;
}
if ( cev->met[rank].buf == recvbuf )
{
*ret=tMPI_Error(TMPI_COMM_WORLD,TMPI_ERR_XFER_BUF_OVERLAP);
return;
}
/* get source buffer */
#ifdef USE_COLLECTIVE_COPY_BUFFER
if ( !(cev->met[rank].using_cb))
#endif
{
srcbuf=cev->met[rank].buf[index];
}
#ifdef USE_COLLECTIVE_COPY_BUFFER
else
{
srcbuf=tMPI_Atomic_ptr_get(&(cev->met[rank].cpbuf[index]));
tMPI_Atomic_memory_barrier_acq();
if(!srcbuf)
{ /* there was (as of yet) no copied buffer */
void *try_again_srcbuf;
/* we need to try checking the pointer again after we increase
the read counter, signaling that one more thread
is reading. */
tMPI_Atomic_add_return(&(cev->met[rank].buf_readcount), 1);
/* a full memory barrier */
tMPI_Atomic_memory_barrier();
try_again_srcbuf=tMPI_Atomic_ptr_get(
&(cev->met[rank].cpbuf[index]));
if (!try_again_srcbuf)
{
/* apparently the copied buffer is not ready yet. We
just use the real source buffer. We have already
indicated we're reading from the regular buf. */
srcbuf=cev->met[rank].buf[index];
decrease_ctr=TRUE;
}
else
{
/* We tried again, and this time there was a copied buffer.
We use that, and indicate that we're not reading from the
regular buf. This case should be pretty rare. */
tMPI_Atomic_fetch_add(&(cev->met[rank].buf_readcount),-1);
tMPI_Atomic_memory_barrier_acq();
srcbuf=try_again_srcbuf;
}
}
#ifdef TMPI_PROFILE
if (srcbuf)
tMPI_Profile_count_buffered_coll_xfer(tMPI_Get_current());
#endif
}
#endif
/* copy data */
memcpy((char*)recvbuf, srcbuf, sendsize);
#ifdef TMPI_PROFILE
tMPI_Profile_count_coll_xfer(tMPI_Get_current());
#endif
#ifdef USE_COLLECTIVE_COPY_BUFFER
if (decrease_ctr)
{
/* we decrement the read count; potentially releasing the buffer. */
tMPI_Atomic_memory_barrier_rel();
tMPI_Atomic_fetch_add( &(cev->met[rank].buf_readcount), -1);
}
#endif
}
/* signal one thread ready */
{
int reta;
tMPI_Atomic_memory_barrier_rel();
reta=tMPI_Atomic_add_return( &(cev->met[rank].n_remaining), -1);
if (reta <= 0)
{
tMPI_Event_signal( &(cev->met[rank].send_ev) );
}
}
}
void* tMPI_Once_wait(tMPI_Comm comm, void* (*function)(void*), void *param,
int *was_first)
{
int myrank;
struct coll_sync *csync;
struct coll_env *cev;
int syncs;
void *ret;
if (!comm)
{
tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
return NULL;
}
myrank=tMPI_Comm_seek_rank(comm, tMPI_Get_current());
/* we increase our counter, and determine which coll_env we get */
csync=&(comm->csync[myrank]);
csync->syncs++;
cev=&(comm->cev[csync->syncs % N_COLL_ENV]);
/* now do a compare-and-swap on the current_syncc */
syncs=tMPI_Atomic_get( &(cev->coll.current_sync));
tMPI_Atomic_memory_barrier_acq();
if ((csync->syncs - syncs > 0) && /* check if sync was an earlier number.
If it is a later number, we can't
have been the first to arrive here.
Calculating the difference instead
of comparing directly avoids ABA
problems. */
tMPI_Atomic_cas(&(cev->coll.current_sync), syncs, csync->syncs))
{
/* we're the first! */
ret=function(param);
if (was_first)
*was_first=TRUE;
/* broadcast the output data */
cev->coll.res=ret;
tMPI_Atomic_memory_barrier_rel();
/* signal that we're done */
tMPI_Atomic_fetch_add(&(cev->coll.current_sync), 1);
/* we need to keep being in sync */
csync->syncs++;
}
else
{
/* we need to wait until the current_syncc gets increased again */
csync->syncs++;
do
{
/*tMPI_Atomic_memory_barrier();*/
syncs=tMPI_Atomic_get( &(cev->coll.current_sync) );
} while (csync->syncs - syncs > 0); /* difference again due to ABA
problems */
tMPI_Atomic_memory_barrier_acq();
ret=cev->coll.res;
}
return ret;
}
void tMPI_Post_multi(struct coll_env *cev, int myrank, int index,
int tag, tMPI_Datatype datatype, size_t bufsize,
void *buf, int n_remaining, int synct, int dest)
{
int i;
#ifdef USE_COLLECTIVE_COPY_BUFFER
/* decide based on the number of waiting threads */
tmpi_bool using_cb=(bufsize < (size_t)(n_remaining*COPY_BUFFER_SIZE));
cev->met[myrank].using_cb=using_cb;
if (using_cb)
{
/* we set it to NULL initially */
/*cev->met[myrank].cpbuf[index]=NULL;*/
tMPI_Atomic_ptr_set(&(cev->met[myrank].cpbuf[index]), NULL);
tMPI_Atomic_set(&(cev->met[myrank].buf_readcount), 0);
}
#endif
cev->met[myrank].tag=tag;
cev->met[myrank].datatype=datatype;
cev->met[myrank].buf[index]=buf;
cev->met[myrank].bufsize[index]=bufsize;
tMPI_Atomic_set(&(cev->met[myrank].n_remaining), n_remaining);
tMPI_Atomic_memory_barrier_rel();
tMPI_Atomic_set(&(cev->met[myrank].current_sync), synct);
/* publish availability. */
if (dest<0)
{
for(i=0;i<cev->N;i++)
{
if (i != myrank)
tMPI_Event_signal( &(cev->met[i].recv_ev) );
}
}
else
{
tMPI_Event_signal( &(cev->met[dest].recv_ev) );
}
#ifdef USE_COLLECTIVE_COPY_BUFFER
/* becase we've published availability, we can start copying --
possibly in parallel with the receiver */
if (using_cb)
{
struct tmpi_thread *cur=tMPI_Get_current();
/* copy the buffer locally. First allocate */
cev->met[myrank].cb=tMPI_Copy_buffer_list_get( &(cur->cbl_multi) );
if (cev->met[myrank].cb->size < bufsize)
{
fprintf(stderr, "ERROR: cb size too small\n");
exit(1);
}
/* copy to the new buf */
memcpy(cev->met[myrank].cb->buf, buf, bufsize);
/* post the new buf */
tMPI_Atomic_memory_barrier_rel();
/*cev->met[myrank].cpbuf[index]=cev->met[myrank].cb->buf;*/
tMPI_Atomic_ptr_set(&(cev->met[myrank].cpbuf[index]),
cev->met[myrank].cb->buf);
}
#endif
}
int tMPI_Gather(void* sendbuf, int sendcount, tMPI_Datatype sendtype,
void* recvbuf, int recvcount, tMPI_Datatype recvtype,
int root, tMPI_Comm comm)
{
int synct;
struct coll_env *cev;
int myrank;
int ret = TMPI_SUCCESS;
struct tmpi_thread *cur = tMPI_Get_current();
#ifdef TMPI_PROFILE
tMPI_Profile_count_start(cur);
#endif
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Gather(%p, %d, %p, %p, %d, %p, %d, %p)",
sendbuf, sendcount, sendtype,
recvbuf, recvcount, recvtype, root, comm);
#endif
if (!comm)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
}
myrank = tMPI_Comm_seek_rank(comm, cur);
/* we increase our counter, and determine which coll_env we get */
cev = tMPI_Get_cev(comm, myrank, &synct);
if (myrank == root)
{
int i;
int n_remaining = comm->grp.N-1;
/* do root transfer */
if (sendbuf != TMPI_IN_PLACE)
{
tMPI_Coll_root_xfer(comm, sendtype, recvtype,
sendtype->size*sendcount,
recvtype->size*recvcount,
sendbuf,
(char*)recvbuf+myrank*recvcount*recvtype->size,
&ret);
}
for (i = 0; i < comm->grp.N; i++)
{
cev->met[myrank].read_data[i] = FALSE;
}
cev->met[myrank].read_data[myrank] = TRUE;
/* wait for data availability as long as there are xfers to be done */
while (n_remaining > 0)
{
#if defined(TMPI_PROFILE) && defined(TMPI_CYCLE_COUNT)
tMPI_Profile_wait_start(cur);
#endif
tMPI_Event_wait( &(cev->met[myrank]).recv_ev );
#if defined(TMPI_PROFILE) && defined(TMPI_CYCLE_COUNT)
tMPI_Profile_wait_stop(cur, TMPIWAIT_Coll_recv);
#endif
/* now check all of them */
for (i = 0; i < comm->grp.N; i++)
{
if (!cev->met[myrank].read_data[i] &&
(tMPI_Atomic_get(&(cev->met[i].current_sync)) == synct))
{
tMPI_Mult_recv(comm, cev, i, 0, TMPI_GATHER_TAG, recvtype,
recvcount*recvtype->size,
(char*)recvbuf+i*recvcount*recvtype->size,
&ret);
tMPI_Event_process( &(cev->met[myrank]).recv_ev, 1);
if (ret != TMPI_SUCCESS)
{
return ret;
}
cev->met[myrank].read_data[i] = TRUE;
n_remaining--;
}
}
}
}
else
{
if (!sendbuf) /* don't do pointer arithmetic on a NULL ptr */
{
return tMPI_Error(comm, TMPI_ERR_BUF);
}
/* first set up the data just to root. */
ret = tMPI_Post_multi(cev, myrank, 0, TMPI_GATHER_TAG, sendtype,
sendcount*sendtype->size, sendbuf, 1, synct, root);
if (ret != TMPI_SUCCESS)
{
return ret;
}
/* and wait until root is done copying */
tMPI_Wait_for_others(cev, myrank);
}
#ifdef TMPI_PROFILE
tMPI_Profile_count_stop(cur, TMPIFN_Gather);
#endif
return ret;
}
int tMPI_Finalize(void)
{
int i;
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Finalize()");
#endif
#ifdef TMPI_DEBUG
printf("%5d: tMPI_Finalize called\n", tMPI_This_threadnr());
fflush(stdout);
#endif
#ifdef TMPI_PROFILE
{
struct tmpi_thread *cur=tMPI_Get_current();
tMPI_Profile_stop( &(cur->profile) );
tMPI_Thread_barrier_wait( &(tmpi_global->barrier) );
if (tMPI_Is_master())
{
tMPI_Profiles_summarize(Nthreads, threads);
}
}
#endif
tMPI_Thread_barrier_wait( &(tmpi_global->barrier) );
if (tMPI_Is_master())
{
/* we just wait for all threads to finish; the order isn't very
relevant, as all threads should arrive at their endpoints soon. */
for(i=1;i<Nthreads;i++)
{
if (tMPI_Thread_join(threads[i].thread_id, NULL))
{
tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_FINALIZE);
}
tMPI_Thread_destroy(&(threads[i]));
}
/* at this point, we are the only thread left, so we can
destroy the global structures with impunity. */
tMPI_Thread_destroy(&(threads[0]));
free(threads);
tMPI_Thread_key_delete(id_key);
/* de-allocate all the comm stuctures. */
{
tMPI_Comm cur=TMPI_COMM_WORLD->next;
while(cur && (cur!=TMPI_COMM_WORLD) )
{
tMPI_Comm next=cur->next;
tMPI_Comm_destroy(cur);
cur=next;
}
tMPI_Comm_destroy(TMPI_COMM_WORLD);
}
tMPI_Group_free(&TMPI_GROUP_EMPTY);
threads=0;
TMPI_COMM_WORLD=NULL;
TMPI_GROUP_EMPTY=NULL;
Nthreads=0;
/* deallocate the 'global' structure */
tMPI_Global_destroy(tmpi_global);
free(tmpi_global);
tmpi_finalized=TRUE;
}
else
{
tMPI_Thread_exit(0);
}
return TMPI_SUCCESS;
}
/* this is the main comm creation function. All other functions that create
comms use this*/
int tMPI_Comm_split(tMPI_Comm comm, int color, int key, tMPI_Comm *newcomm)
{
int i, j;
int N = tMPI_Comm_N(comm);
volatile tMPI_Comm *newcomm_list;
volatile int colors[MAX_PREALLOC_THREADS]; /* array with the colors
of each thread */
volatile int keys[MAX_PREALLOC_THREADS]; /* same for keys (only one of
the threads actually suplies
these arrays to the comm
structure) */
tmpi_bool i_am_first = FALSE;
int myrank = tMPI_Comm_seek_rank(comm, tMPI_Get_current());
struct tmpi_split *spl;
int ret;
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Comm_split(%p, %d, %d, %p)", comm, color, key,
newcomm);
#endif
if (!comm)
{
*newcomm = NULL;
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
}
ret = tMPI_Thread_mutex_lock(&(comm->comm_create_lock));
if (ret != 0)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_IO);
}
/* first get the colors */
if (!comm->new_comm)
{
/* i am apparently first */
comm->split = (struct tmpi_split*)tMPI_Malloc(sizeof(struct tmpi_split));
comm->new_comm = (tMPI_Comm*)tMPI_Malloc(N*sizeof(tMPI_Comm));
if (N <= MAX_PREALLOC_THREADS)
{
comm->split->colors = colors;
comm->split->keys = keys;
}
else
{
comm->split->colors = (int*)tMPI_Malloc(N*sizeof(int));
comm->split->keys = (int*)tMPI_Malloc(N*sizeof(int));
}
comm->split->Ncol_init = tMPI_Comm_N(comm);
comm->split->can_finish = FALSE;
i_am_first = TRUE;
/* the main communicator contains a list the size of grp.N */
}
newcomm_list = comm->new_comm; /* we copy it to the local stacks because
we can later erase comm->new_comm safely */
spl = comm->split; /* we do the same for spl */
spl->colors[myrank] = color;
spl->keys[myrank] = key;
spl->Ncol_init--;
if (spl->Ncol_init == 0)
{
ret = tMPI_Thread_cond_signal(&(comm->comm_create_prep));
if (ret != 0)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_IO);
}
}
if (!i_am_first)
{
/* all other threads can just wait until the creator thread is
finished */
while (!spl->can_finish)
{
ret = tMPI_Thread_cond_wait(&(comm->comm_create_finish),
&(comm->comm_create_lock) );
if (ret != 0)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_IO);
}
}
}
else
{
int Ncomms = 0;
int comm_color_[MAX_PREALLOC_THREADS];
int comm_N_[MAX_PREALLOC_THREADS];
int *comm_color = comm_color_; /* there can't be more comms than N*/
int *comm_N = comm_N_; /* the number of procs in a group */
int *comm_groups; /* the groups */
tMPI_Comm *comms; /* the communicators */
/* wait for the colors to be done */
/*if (N>1)*/
while (spl->Ncol_init > 0)
{
ret = tMPI_Thread_cond_wait(&(comm->comm_create_prep),
&(comm->comm_create_lock));
if (ret != 0)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_IO);
}
}
/* reset the state so that a new comm creating function can run */
spl->Ncol_destroy = N;
comm->new_comm = 0;
comm->split = 0;
comm_groups = (int*)tMPI_Malloc(N*N*sizeof(int));
if (N > MAX_PREALLOC_THREADS)
{
comm_color = (int*)tMPI_Malloc(N*sizeof(int));
comm_N = (int*)tMPI_Malloc(N*sizeof(int));
}
/* count colors, allocate and split up communicators */
tMPI_Split_colors(N, (int*)spl->colors,
(int*)spl->keys,
&Ncomms,
comm_N, comm_color, comm_groups);
/* allocate a bunch of communicators */
comms = (tMPI_Comm*)tMPI_Malloc(Ncomms*sizeof(tMPI_Comm));
for (i = 0; i < Ncomms; i++)
{
ret = tMPI_Comm_alloc(&(comms[i]), comm, comm_N[i]);
if (ret != TMPI_SUCCESS)
{
return ret;
}
}
/* now distribute the comms */
for (i = 0; i < Ncomms; i++)
{
comms[i]->grp.N = comm_N[i];
for (j = 0; j < comm_N[i]; j++)
{
comms[i]->grp.peers[j] =
comm->grp.peers[comm_groups[i*comm->grp.N + j]];
}
}
/* and put them into the newcomm_list */
for (i = 0; i < N; i++)
{
newcomm_list[i] = TMPI_COMM_NULL;
for (j = 0; j < Ncomms; j++)
{
if (spl->colors[i] == comm_color[j])
{
newcomm_list[i] = comms[j];
break;
}
}
}
#ifdef TMPI_DEBUG
/* output */
for (i = 0; i < Ncomms; i++)
{
printf("Group %d (color %d) has %d members: ",
i, comm_color[i], comm_N[i]);
for (j = 0; j < comm_N[i]; j++)
{
printf(" %d ", comm_groups[comm->grp.N*i + j]);
}
printf(" rank: ");
for (j = 0; j < comm_N[i]; j++)
{
printf(" %d ", spl->keys[comm_groups[N*i + j]]);
}
printf(" color: ");
for (j = 0; j < comm_N[i]; j++)
{
printf(" %d ", spl->colors[comm_groups[N*i + j]]);
}
printf("\n");
}
#endif
if (N > MAX_PREALLOC_THREADS)
{
free((int*)spl->colors);
free((int*)spl->keys);
free(comm_color);
free(comm_N);
}
free(comm_groups);
free(comms);
spl->can_finish = TRUE;
/* tell the waiting threads that there's a comm ready */
ret = tMPI_Thread_cond_broadcast(&(comm->comm_create_finish));
if (ret != 0)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_IO);
}
}
/* here the individual threads get their comm object */
*newcomm = newcomm_list[myrank];
/* free when we have assigned them all, so we can reuse the object*/
spl->Ncol_destroy--;
if (spl->Ncol_destroy == 0)
{
free((void*)newcomm_list);
free(spl);
}
ret = tMPI_Thread_mutex_unlock(&(comm->comm_create_lock));
if (ret != 0)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_IO);
}
return TMPI_SUCCESS;
}
unsigned int tMPI_This_threadnr(void)
{
return tMPI_Get_current()-threads;
}
int tMPI_Scan(void* sendbuf, void* recvbuf, int count,
tMPI_Datatype datatype, tMPI_Op op, tMPI_Comm comm)
{
struct tmpi_thread *cur=tMPI_Get_current();
int myrank=tMPI_Comm_seek_rank(comm, cur);
int N=tMPI_Comm_N(comm);
int prev=myrank - 1; /* my previous neighbor */
int next=myrank + 1; /* my next neighbor */
#ifdef TMPI_PROFILE
tMPI_Profile_count_start(cur);
#endif
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Scan(%p, %p, %d, %p, %p, %p)",
sendbuf, recvbuf, count, datatype, op, comm);
#endif
if (count==0)
return TMPI_SUCCESS;
if (!recvbuf)
{
return tMPI_Error(comm, TMPI_ERR_BUF);
}
if (sendbuf==TMPI_IN_PLACE)
{
sendbuf=recvbuf;
}
/* we set our send and recv buffers */
tMPI_Atomic_ptr_set(&(comm->reduce_sendbuf[myrank]),sendbuf);
tMPI_Atomic_ptr_set(&(comm->reduce_recvbuf[myrank]),recvbuf);
/* now wait for the previous rank to finish */
if (myrank > 0)
{
void *a, *b;
int ret;
#if defined(TMPI_PROFILE) && defined(TMPI_CYCLE_COUNT)
tMPI_Profile_wait_start(cur);
#endif
/* wait for the previous neighbor's data to be ready */
tMPI_Event_wait( &(comm->csync[myrank].events[prev]) );
tMPI_Event_process( &(comm->csync[myrank].events[prev]), 1);
#if defined(TMPI_PROFILE) && defined(TMPI_CYCLE_COUNT)
tMPI_Profile_wait_stop(cur, TMPIWAIT_Reduce);
#endif
#ifdef TMPI_DEBUG
printf("%d: scanning with %d \n", myrank, prev, iteration);
fflush(stdout);
#endif
/* now do the reduction */
if (prev > 0)
{
a = (void*)tMPI_Atomic_ptr_get(&(comm->reduce_recvbuf[prev]));
}
else
{
a = (void*)tMPI_Atomic_ptr_get(&(comm->reduce_sendbuf[prev]));
}
b = sendbuf;
if ((ret=tMPI_Reduce_run_op(recvbuf, a, b, datatype,
count, op, comm)) != TMPI_SUCCESS)
{
return ret;
}
/* signal to my previous neighbor that I'm done with the data */
tMPI_Event_signal( &(comm->csync[prev].events[prev]) );
}
else
{
if (sendbuf != recvbuf)
{
/* copy the data if this is rank 0, and not MPI_IN_PLACE */
memcpy(recvbuf, sendbuf, count*datatype->size);
}
}
if (myrank < N-1)
{
/* signal to my next neighbor that I have the data */
tMPI_Event_signal( &(comm->csync[next].events[myrank]) );
/* and wait for my next neighbor to finish */
tMPI_Event_wait( &(comm->csync[myrank].events[myrank]) );
tMPI_Event_process( &(comm->csync[myrank].events[myrank]), 1);
}
#if defined(TMPI_PROFILE) && defined(TMPI_CYCLE_COUNT)
tMPI_Profile_wait_start(cur);
#endif
/*tMPI_Barrier_wait( &(comm->barrier));*/
#if defined(TMPI_PROFILE)
/*tMPI_Profile_wait_stop(cur, TMPIWAIT_Reduce);*/
tMPI_Profile_count_stop(cur, TMPIFN_Scan);
#endif
return TMPI_SUCCESS;
}
int tMPI_Alltoall(void* sendbuf, int sendcount, tMPI_Datatype sendtype,
void* recvbuf, int recvcount, tMPI_Datatype recvtype,
tMPI_Comm comm)
{
int synct;
struct coll_env *cev;
int myrank;
int ret = TMPI_SUCCESS;
int i;
size_t sendsize = sendtype->size*sendcount;
size_t recvsize = recvtype->size*recvcount;
int n_remaining;
struct tmpi_thread *cur = tMPI_Get_current();
#ifdef TMPI_PROFILE
tMPI_Profile_count_start(cur);
#endif
#ifdef TMPI_TRACE
tMPI_Trace_print("tMPI_Alltoall(%p, %d, %p, %p, %d, %p, %p)",
sendbuf, sendcount, sendtype,
recvbuf, recvcount, recvtype, comm);
#endif
if (!comm)
{
return tMPI_Error(TMPI_COMM_WORLD, TMPI_ERR_COMM);
}
if (!sendbuf || !recvbuf) /* don't do pointer arithmetic on a NULL ptr */
{
return tMPI_Error(comm, TMPI_ERR_BUF);
}
myrank = tMPI_Comm_seek_rank(comm, cur);
/* we increase our counter, and determine which coll_env we get */
cev = tMPI_Get_cev(comm, myrank, &synct);
/* post our pointers */
/* we set up multiple posts, so no Post_multi */
cev->met[myrank].tag = TMPI_ALLTOALL_TAG;
cev->met[myrank].datatype = sendtype;
tMPI_Atomic_set( &(cev->met[myrank].n_remaining), cev->N-1 );
for (i = 0; i < comm->grp.N; i++)
{
cev->met[myrank].bufsize[i] = sendsize;
cev->met[myrank].buf[i] = (char*)sendbuf+sendsize*i;
cev->met[myrank].read_data[i] = FALSE;
}
tMPI_Atomic_memory_barrier_rel();
tMPI_Atomic_set(&(cev->met[myrank].current_sync), synct);
/* post availability */
for (i = 0; i < cev->N; i++)
{
if (i != myrank)
{
tMPI_Event_signal( &(cev->met[i].recv_ev) );
}
}
/* we don't do the copy buffer thing here because it's pointless:
the processes have to synchronize anyway, because they all
send and receive. */
/* do root transfer */
tMPI_Coll_root_xfer(comm, sendtype, recvtype,
sendsize, recvsize,
(char*)sendbuf+sendsize*myrank,
(char*)recvbuf+recvsize*myrank, &ret);
cev->met[myrank].read_data[myrank] = TRUE;
/* and poll data availability */
n_remaining = cev->N-1;
while (n_remaining > 0)
{
#if defined(TMPI_PROFILE) && defined(TMPI_CYCLE_COUNT)
tMPI_Profile_wait_start(cur);
#endif
tMPI_Event_wait( &(cev->met[myrank]).recv_ev );
#if defined(TMPI_PROFILE) && defined(TMPI_CYCLE_COUNT)
tMPI_Profile_wait_stop(cur, TMPIWAIT_Coll_recv);
#endif
for (i = 0; i < cev->N; i++)
{
if ((!cev->met[myrank].read_data[i]) &&
(tMPI_Atomic_get(&(cev->met[i].current_sync)) == synct))
{
tMPI_Event_process( &(cev->met[myrank]).recv_ev, 1);
tMPI_Mult_recv(comm, cev, i, myrank, TMPI_ALLTOALL_TAG,
recvtype, recvsize, (char*)recvbuf+recvsize*i,
&ret);
if (ret != TMPI_SUCCESS)
{
return ret;
}
cev->met[myrank].read_data[i] = TRUE;
n_remaining--;
}
}
}
/* and wait until everybody is done copying our data */
tMPI_Wait_for_others(cev, myrank);
#ifdef TMPI_PROFILE
tMPI_Profile_count_stop(cur, TMPIFN_Alltoall);
#endif
return ret;
}
