359464a144
--enable-mpi-ext configure switch in the top-level README file).
See Josh's excellent wiki page about OMPI extensions:
https://svn.open-mpi.org/trac/ompi/wiki/MPIExtensions
This extension exposes a new API to MPI applications:
{{{
int OMPI_Affinity_str(char ompi_bound[OMPI_AFFINITY_STRING_MAX],
char current_binding[OMPI_AFFINITY_STRING_MAX],
char exists[OMPI_AFFINITY_STRING_MAX]);
}}}
It returns 3 things. Each are a prettyprint string describing sets of
processors in terms of sockets and cores:
1. What Open MPI bound this process to. If Open MPI didn't bind this
process, the prettyprint string says so.
1. What this process is currently bound to. If the process is
unbound, the prettyprint string says so. This string is a
separate OUT parameter to detect the case where some other entity
bound the process (potentially after Open MPI bound it).
1. What processors are availabile in the system, mainly for reference.
This commit was SVN r23018.
139 строки
4.1 KiB
C
139 строки
4.1 KiB
C
/*
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* Copyright (c) 2004-2009 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) 2010 Cisco Systems, Inc. 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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* Simple routine to expose three things to the MPI process:
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*
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* 1. What processor(s) Open MPI bound this process to
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* 2. What processor(s) this process is bound to
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* 3. What processor(s) exist on this host
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*
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* Note that 1 and 2 may be different!
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*/
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#include "ompi_config.h"
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#include <stdio.h>
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#include <string.h>
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#include "opal/mca/paffinity/base/base.h"
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#include "ompi/communicator/communicator.h"
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#include "ompi/errhandler/errhandler.h"
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#include "ompi/mpi/c/bindings.h"
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#include "ompi/mpiext/affinity/mpiext_affinity_c.h"
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static const char FUNC_NAME[] = "OMPI_Affinity";
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static int fill_ompi_bound(char str[OMPI_AFFINITY_STRING_MAX]);
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static int fill_current_binding(char str[OMPI_AFFINITY_STRING_MAX]);
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static int fill_exists(char str[OMPI_AFFINITY_STRING_MAX]);
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int OMPI_Affinity_str(char ompi_bound[OMPI_AFFINITY_STRING_MAX],
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char current_binding[OMPI_AFFINITY_STRING_MAX],
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char exists[OMPI_AFFINITY_STRING_MAX])
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{
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int ret;
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memset(ompi_bound, 0, sizeof(ompi_bound));
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memset(current_binding, 0, sizeof(current_binding));
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if (OPAL_SUCCESS != (ret = fill_ompi_bound(ompi_bound)) ||
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OPAL_SUCCESS != (ret = fill_current_binding(current_binding)) ||
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OPAL_SUCCESS != (ret = fill_exists(exists))) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, ret, FUNC_NAME);
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}
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return MPI_SUCCESS;
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}
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static int fill_ompi_bound(char str[OMPI_AFFINITY_STRING_MAX])
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{
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int ret;
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opal_paffinity_base_cpu_set_t cset;
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/* If OMPI did not bind, indicate that */
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if (!opal_paffinity_base_bound) {
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const char tmp[] = "Open MPI did not bind this process";
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strncpy(str, tmp, OMPI_AFFINITY_STRING_MAX - 1);
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return OPAL_SUCCESS;
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}
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/* Find out what OMPI bound us to and prettyprint it */
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ret =
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opal_paffinity_base_parse_binding(opal_paffinity_base_applied_binding,
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&cset);
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if (OPAL_SUCCESS != ret) {
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return ret;
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}
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return opal_paffinity_base_cset2str(str, OMPI_AFFINITY_STRING_MAX, &cset);
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}
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static int fill_current_binding(char str[OMPI_AFFINITY_STRING_MAX])
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{
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int ret, flag;
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opal_paffinity_base_cpu_set_t cset;
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/* Are we bound anywhere? */
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OPAL_PAFFINITY_PROCESS_IS_BOUND(cset, &flag);
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if (!flag) {
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const char tmp[] = "Not bound (or bound to all available processors)";
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strncat(str, tmp, OMPI_AFFINITY_STRING_MAX - 1);
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return OPAL_SUCCESS;
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}
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/* Get our binding */
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ret = opal_paffinity_base_get(&cset);
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if (OPAL_SUCCESS != ret) {
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return ret;
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}
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return opal_paffinity_base_cset2str(str, OMPI_AFFINITY_STRING_MAX, &cset);
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}
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/* Prettyprint a list of all available processors */
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static int fill_exists(char str[OMPI_AFFINITY_STRING_MAX])
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{
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int ret, i, num_sockets, num_cores;
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char tmp[BUFSIZ];
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const int stmp = sizeof(tmp) - 1;
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tmp[stmp] = '\0';
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/* Loop over the number of sockets in this machine */
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ret = opal_paffinity_base_get_socket_info(&num_sockets);
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if (OPAL_SUCCESS != ret) {
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return ret;
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}
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for (i = 0; i < num_sockets; ++i) {
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if (i > 0) {
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strncat(str, ", ", OMPI_AFFINITY_STRING_MAX - strlen(str));
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}
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snprintf(tmp, stmp, "socket %d has ", i);
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strncat(str, tmp, OMPI_AFFINITY_STRING_MAX - strlen(str));
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/* Loop over the number of cores in this socket */
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ret = opal_paffinity_base_get_core_info(i, &num_cores);
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if (OPAL_SUCCESS != ret) {
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return ret;
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}
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if (1 == num_cores) {
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strncat(str, "1 core", OMPI_AFFINITY_STRING_MAX - strlen(str));
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} else {
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snprintf(tmp, stmp, "%d cores", num_cores);
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strncat(str, tmp, OMPI_AFFINITY_STRING_MAX - strlen(str));
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}
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}
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return OPAL_SUCCESS;
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}
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