int mca_io_ompio_file_iread_at_all (ompi_file_t *fh, OMPI_MPI_OFFSET_TYPE offset, void *buf, int count, struct ompi_datatype_t *datatype, ompi_request_t **request) { int ret = OMPI_SUCCESS; mca_io_ompio_data_t *data; data = (mca_io_ompio_data_t *) fh->f_io_selected_data; ret = ompio_io_ompio_file_iread_at_all ( &data->ompio_fh, offset, buf, count, datatype, request ); return ret; }
int mca_io_ompio_file_read_at_all_begin (ompi_file_t *fh, OMPI_MPI_OFFSET_TYPE offset, void *buf, int count, struct ompi_datatype_t *datatype) { int ret = OMPI_SUCCESS; mca_io_ompio_data_t *data; mca_io_ompio_file_t *fp=NULL; data = (mca_io_ompio_data_t *) fh->f_io_selected_data; fp = &data->ompio_fh; if ( true == fp->f_split_coll_in_use ) { printf("Only one split collective I/O operation allowed per file handle at any given point in time!\n"); return MPI_ERR_REQUEST; } ret = ompio_io_ompio_file_iread_at_all ( fp, offset, buf, count, datatype, &fp->f_split_coll_req ); fp->f_split_coll_in_use = true; return ret; }
int mca_sharedfp_sm_read_ordered_begin(mca_io_ompio_file_t *fh, void *buf, int count, struct ompi_datatype_t *datatype) { int ret = OMPI_SUCCESS; OMPI_MPI_OFFSET_TYPE offset = 0; long sendBuff = 0; long *buff=NULL; long offsetBuff; OMPI_MPI_OFFSET_TYPE offsetReceived = 0; long bytesRequested = 0; int recvcnt = 1, sendcnt = 1; size_t numofBytes; int rank, size, i; struct mca_sharedfp_base_data_t *sh = NULL; mca_sharedfp_base_module_t * shared_fp_base_module = NULL; if ( NULL == fh->f_sharedfp_data){ if ( mca_sharedfp_sm_verbose ) { opal_output(ompi_sharedfp_base_framework.framework_output, "sharedfp_sm_read_ordered_begin: opening the shared file pointer\n"); } shared_fp_base_module = fh->f_sharedfp; ret = shared_fp_base_module->sharedfp_file_open(fh->f_comm, fh->f_filename, fh->f_amode, fh->f_info, fh); if ( OMPI_SUCCESS != ret ) { opal_output(0,"sharedfp_sm_read_ordered_begin - error opening the shared file pointer\n"); return ret; } } if ( true == fh->f_split_coll_in_use ) { opal_output(0,"Only one split collective I/O operation allowed per file handle at any given point in time!\n"); return MPI_ERR_REQUEST; } /*Retrieve the new communicator*/ sh = fh->f_sharedfp_data; /* Calculate the number of bytes to read*/ opal_datatype_type_size ( &datatype->super, &numofBytes); sendBuff = count * numofBytes; /* Get the ranks in the communicator */ rank = ompi_comm_rank ( sh->comm ); size = ompi_comm_size ( sh->comm ); if ( 0 == rank ) { buff = (long*)malloc(sizeof(long) * size); if ( NULL == buff ) return OMPI_ERR_OUT_OF_RESOURCE; } ret = sh->comm->c_coll.coll_gather ( &sendBuff, sendcnt, OMPI_OFFSET_DATATYPE, buff, recvcnt, OMPI_OFFSET_DATATYPE, 0, sh->comm, sh->comm->c_coll.coll_gather_module ); if( OMPI_SUCCESS != ret){ goto exit; } /* All the counts are present now in the recvBuff. ** The size of recvBuff is sizeof_newComm */ if ( 0 == rank ) { for (i = 0; i < size ; i ++) { bytesRequested += buff[i]; if ( mca_sharedfp_sm_verbose ) { opal_output(ompi_sharedfp_base_framework.framework_output, "mca_sharedfp_sm_read_ordered_begin: Bytes requested are %ld\n", bytesRequested); } } /* Request the offset to read bytesRequested bytes ** only the root process needs to do the request, ** since the root process will then tell the other ** processes at what offset they should read their ** share of the data. */ ret = mca_sharedfp_sm_request_position(sh,bytesRequested,&offsetReceived); if( OMPI_SUCCESS != ret){ goto exit; } if ( mca_sharedfp_sm_verbose ) { opal_output(ompi_sharedfp_base_framework.framework_output, "mca_sharedfp_sm_read_ordered_begin: Offset received is %lld\n",offsetReceived); } buff[0] += offsetReceived; for (i = 1 ; i < size; i++) { buff[i] += buff[i-1]; } } /* Scatter the results to the other processes*/ ret = sh->comm->c_coll.coll_scatter ( buff, sendcnt, OMPI_OFFSET_DATATYPE, &offsetBuff, recvcnt, OMPI_OFFSET_DATATYPE, 0, sh->comm, sh->comm->c_coll.coll_scatter_module ); if( OMPI_SUCCESS != ret){ goto exit; } /*Each process now has its own individual offset in recvBUFF*/ offset = offsetBuff - sendBuff; offset /= sh->sharedfh->f_etype_size; if ( mca_sharedfp_sm_verbose ) { opal_output(ompi_sharedfp_base_framework.framework_output, "mca_sharedfp_sm_read_ordered_begin: Offset returned is %lld\n",offset); } /* read to the file */ ret = ompio_io_ompio_file_iread_at_all(sh->sharedfh,offset,buf,count,datatype, &fh->f_split_coll_req); fh->f_split_coll_in_use = true; exit: if ( NULL != buff ) { free ( buff ); } return ret; }