131 строка
3.7 KiB
C
131 строка
3.7 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2014 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "coll_basic.h"
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#include <stdio.h>
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#include "mpi.h"
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#include "ompi/constants.h"
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#include "ompi/op/op.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "ompi/mca/pml/pml.h"
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#include "coll_basic.h"
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/*
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* scan
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*
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* Function: - basic scan operation
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* Accepts: - same arguments as MPI_Scan()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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mca_coll_basic_scan_intra(void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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struct ompi_communicator_t *comm,
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mca_coll_base_module_t *module)
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{
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int size, rank, err;
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ptrdiff_t true_lb, true_extent, lb, extent;
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char *free_buffer = NULL;
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char *pml_buffer = NULL;
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/* Initialize */
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rank = ompi_comm_rank(comm);
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size = ompi_comm_size(comm);
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/* If I'm rank 0, just copy into the receive buffer */
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if (0 == rank) {
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if (MPI_IN_PLACE != sbuf) {
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err = ompi_datatype_copy_content_same_ddt(dtype, count, (char*)rbuf, (char*)sbuf);
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if (MPI_SUCCESS != err) {
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return err;
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}
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}
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}
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/* Otherwise receive previous buffer and reduce. */
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else {
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/* Allocate a temporary buffer. Rationale for this size is
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* listed in coll_basic_reduce.c. Use this temporary buffer to
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* receive into, later. */
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ompi_datatype_get_extent(dtype, &lb, &extent);
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ompi_datatype_get_true_extent(dtype, &true_lb, &true_extent);
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free_buffer = (char*)malloc(true_extent + (count - 1) * extent);
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if (NULL == free_buffer) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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pml_buffer = free_buffer - true_lb;
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/* Copy the send buffer into the receive buffer. */
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if (MPI_IN_PLACE != sbuf) {
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err = ompi_datatype_copy_content_same_ddt(dtype, count, (char*)rbuf, (char*)sbuf);
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if (MPI_SUCCESS != err) {
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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return err;
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}
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}
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/* Receive the prior answer */
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err = MCA_PML_CALL(recv(pml_buffer, count, dtype,
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rank - 1, MCA_COLL_BASE_TAG_SCAN, comm,
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MPI_STATUS_IGNORE));
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if (MPI_SUCCESS != err) {
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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return err;
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}
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/* Perform the operation */
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ompi_op_reduce(op, pml_buffer, rbuf, count, dtype);
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/* All done */
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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}
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/* Send result to next process. */
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if (rank < (size - 1)) {
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return MCA_PML_CALL(send(rbuf, count, dtype, rank + 1,
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MCA_COLL_BASE_TAG_SCAN,
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MCA_PML_BASE_SEND_STANDARD, comm));
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}
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/* All done */
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return MPI_SUCCESS;
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}
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