4d00c59b2e
some of the collective modules. Added a new function opan_datatype_span, to compute the memory span of count number of datatype, excluding the gaps in the beginning and at the end. If a memory allocation is made using the returned value, the gap (also returned) should be removed from the allocated pointer.
136 строки
4.5 KiB
C
136 строки
4.5 KiB
C
/*
|
|
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
|
|
* University Research and Technology
|
|
* Corporation. All rights reserved.
|
|
* Copyright (c) 2004-2014 The University of Tennessee and The University
|
|
* of Tennessee Research Foundation. All rights
|
|
* reserved.
|
|
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
|
|
* University of Stuttgart. All rights reserved.
|
|
* Copyright (c) 2004-2005 The Regents of the University of California.
|
|
* All rights reserved.
|
|
* Copyright (c) 2011 NVIDIA Corporation. All rights reserved.
|
|
* Copyright (c) 2015 Research Organization for Information Science
|
|
* and Technology (RIST). All rights reserved.
|
|
* $COPYRIGHT$
|
|
*
|
|
* Additional copyrights may follow
|
|
*
|
|
* $HEADER$
|
|
*/
|
|
|
|
#include "ompi_config.h"
|
|
#include "coll_basic.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "mpi.h"
|
|
#include "ompi/constants.h"
|
|
#include "ompi/op/op.h"
|
|
#include "ompi/datatype/ompi_datatype.h"
|
|
#include "ompi/mca/pml/pml.h"
|
|
#include "ompi/mca/coll/coll.h"
|
|
#include "ompi/mca/coll/base/coll_tags.h"
|
|
#include "coll_basic.h"
|
|
|
|
|
|
/*
|
|
* exscan_intra
|
|
*
|
|
* Function: - basic exscan operation
|
|
* Accepts: - same arguments as MPI_Exscan()
|
|
* Returns: - MPI_SUCCESS or error code
|
|
*/
|
|
int
|
|
mca_coll_basic_exscan_intra(const void *sbuf, void *rbuf, int count,
|
|
struct ompi_datatype_t *dtype,
|
|
struct ompi_op_t *op,
|
|
struct ompi_communicator_t *comm,
|
|
mca_coll_base_module_t *module)
|
|
{
|
|
int size, rank, err;
|
|
ptrdiff_t dsize, gap;
|
|
char *free_buffer = NULL;
|
|
char *reduce_buffer = NULL;
|
|
|
|
rank = ompi_comm_rank(comm);
|
|
size = ompi_comm_size(comm);
|
|
|
|
/* For MPI_IN_PLACE, just adjust send buffer to point to
|
|
* receive buffer. */
|
|
if (MPI_IN_PLACE == sbuf) {
|
|
sbuf = rbuf;
|
|
}
|
|
|
|
/* If we're rank 0, then just send our sbuf to the next rank, and
|
|
* we are done. */
|
|
if (0 == rank) {
|
|
return MCA_PML_CALL(send(sbuf, count, dtype, rank + 1,
|
|
MCA_COLL_BASE_TAG_EXSCAN,
|
|
MCA_PML_BASE_SEND_STANDARD, comm));
|
|
}
|
|
|
|
/* If we're the last rank, then just receive the result from the
|
|
* prior rank, and we are done. */
|
|
else if ((size - 1) == rank) {
|
|
return MCA_PML_CALL(recv(rbuf, count, dtype, rank - 1,
|
|
MCA_COLL_BASE_TAG_EXSCAN, comm,
|
|
MPI_STATUS_IGNORE));
|
|
}
|
|
|
|
/* Otherwise, get the result from the prior rank, combine it with my
|
|
* data, and send it to the next rank */
|
|
|
|
/* Get a temporary buffer to perform the reduction into. Rationale
|
|
* for malloc'ing this size is provided in coll_basic_reduce.c. */
|
|
dsize = opal_datatype_span(&dtype->super, count, &gap);
|
|
|
|
free_buffer = (char*)malloc(dsize);
|
|
if (NULL == free_buffer) {
|
|
return OMPI_ERR_OUT_OF_RESOURCE;
|
|
}
|
|
reduce_buffer = free_buffer - gap;
|
|
err = ompi_datatype_copy_content_same_ddt(dtype, count,
|
|
reduce_buffer, (char*)sbuf);
|
|
|
|
/* Receive the reduced value from the prior rank */
|
|
err = MCA_PML_CALL(recv(rbuf, count, dtype, rank - 1,
|
|
MCA_COLL_BASE_TAG_EXSCAN, comm, MPI_STATUS_IGNORE));
|
|
if (MPI_SUCCESS != err) {
|
|
goto error;
|
|
}
|
|
|
|
/* Now reduce the prior rank's result with my source buffer. The source
|
|
* buffer had been previously copied into the temporary reduce_buffer. */
|
|
ompi_op_reduce(op, rbuf, reduce_buffer, count, dtype);
|
|
|
|
/* Send my result off to the next rank */
|
|
err = MCA_PML_CALL(send(reduce_buffer, count, dtype, rank + 1,
|
|
MCA_COLL_BASE_TAG_EXSCAN,
|
|
MCA_PML_BASE_SEND_STANDARD, comm));
|
|
/* Error */
|
|
error:
|
|
free(free_buffer);
|
|
|
|
/* All done */
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* exscan_inter
|
|
*
|
|
* Function: - basic exscan operation
|
|
* Accepts: - same arguments as MPI_Exscan()
|
|
* Returns: - MPI_SUCCESS or error code
|
|
*/
|
|
int
|
|
mca_coll_basic_exscan_inter(const void *sbuf, void *rbuf, int count,
|
|
struct ompi_datatype_t *dtype,
|
|
struct ompi_op_t *op,
|
|
struct ompi_communicator_t *comm,
|
|
mca_coll_base_module_t *module)
|
|
{
|
|
return OMPI_ERR_NOT_IMPLEMENTED;
|
|
}
|