root/ompi/mca/coll/cuda/coll_cuda_scan.c

DEFINITIONS

1. mca_coll_cuda_scan

   1 /*
   2  * Copyright (c) 2014-2017 The University of Tennessee and The University
   3  *                         of Tennessee Research Foundation.  All rights
   4  *                         reserved.
   5  * Copyright (c) 2014-2015 NVIDIA Corporation.  All rights reserved.
   6  * $COPYRIGHT$
   7  *
   8  * Additional copyrights may follow
   9  *
  10  * $HEADER$
  11  */
  12 
  13 #include "ompi_config.h"
  14 #include "coll_cuda.h"
  15 
  16 #include <stdio.h>
  17 
  18 #include "ompi/op/op.h"
  19 #include "opal/datatype/opal_convertor.h"
  20 #include "opal/datatype/opal_datatype_cuda.h"
  21 
  22 /*
  23  *      scan
  24  *
  25  *      Function:       - scan
  26  *      Accepts:        - same arguments as MPI_Scan()
  27  *      Returns:        - MPI_SUCCESS or error code
  28  */
  29 int mca_coll_cuda_scan(const void *sbuf, void *rbuf, int count,
  30                        struct ompi_datatype_t *dtype,
  31                        struct ompi_op_t *op,
  32                        struct ompi_communicator_t *comm,
  33                        mca_coll_base_module_t *module)
  34 {
  35     mca_coll_cuda_module_t *s = (mca_coll_cuda_module_t*) module;
  36     ptrdiff_t gap;
  37     char *rbuf1 = NULL, *sbuf1 = NULL, *rbuf2 = NULL;
  38     size_t bufsize;
  39     int rc;
  40 
  41     bufsize = opal_datatype_span(&dtype->super, count, &gap);
  42 
  43     if ((MPI_IN_PLACE != sbuf) && (opal_cuda_check_bufs((char *)sbuf, NULL))) {
  44         sbuf1 = (char*)malloc(bufsize);
  45         if (NULL == sbuf1) {
  46             return OMPI_ERR_OUT_OF_RESOURCE;
  47         }
  48         opal_cuda_memcpy_sync(sbuf1, sbuf, bufsize);
  49         sbuf = sbuf1 - gap;
  50     }
  51 
  52     if (opal_cuda_check_bufs(rbuf, NULL)) {
  53         rbuf1 = (char*)malloc(bufsize);
  54         if (NULL == rbuf1) {
  55             if (NULL != sbuf1) free(sbuf1);
  56             return OMPI_ERR_OUT_OF_RESOURCE;
  57         }
  58         opal_cuda_memcpy_sync(rbuf1, rbuf, bufsize);
  59         rbuf2 = rbuf; /* save away original buffer */
  60         rbuf = rbuf1 - gap;
  61     }
  62     rc = s->c_coll.coll_scan(sbuf, rbuf, count, dtype, op, comm,
  63                              s->c_coll.coll_scan_module);
  64     if (NULL != sbuf1) {
  65         free(sbuf1);
  66     }
  67     if (NULL != rbuf1) {
  68         rbuf = rbuf2;
  69         opal_cuda_memcpy_sync(rbuf, rbuf1, bufsize);
  70         free(rbuf1);
  71     }
  72     return rc;
  73 }