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/*
* Copyright (c) 2004-2008 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2006 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) 2007-2015 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2010-2011 Los Alamos National Security, LLC.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include <string.h>
#include "opal/constants.h"
#include "opal/mca/base/base.h"
#include "opal/mca/mca.h"
#include "opal/mca/shmem/base/base.h"
#include "opal/mca/shmem/shmem.h"
#include "opal/util/output.h"
/*
* globals
*/
bool opal_shmem_base_selected = false;
opal_shmem_base_component_t *opal_shmem_base_component = NULL;
opal_shmem_base_module_t *opal_shmem_base_module = NULL;
/* ////////////////////////////////////////////////////////////////////////// */
/*
* Performs a run-time query across all available shmem components.
* Similar to mca_base_select, but take into consideration environment
* hints provided by prte.
*/
static int opal_shmem_base_runtime_query(mca_base_module_t **best_module,
mca_base_component_t **best_component)
{
mca_base_component_list_item_t *cli = NULL;
mca_base_component_t *component = NULL;
mca_base_module_t *module = NULL;
int priority = 0, best_priority = INT32_MIN;
/* If we've already done this query, then just return the
results */
if (opal_shmem_base_selected) {
*best_component = &(opal_shmem_base_component->base_version);
*best_module = &(opal_shmem_base_module->base);
return OPAL_SUCCESS;
}
*best_module = NULL;
*best_component = NULL;
opal_output_verbose(10, opal_shmem_base_framework.framework_output,
"shmem: base: runtime_query: "
"Auto-selecting shmem components");
/* traverse the list of available components.
* for each call their 'run-time query' functions to determine relative
* priority.
*/
OPAL_LIST_FOREACH (cli, &opal_shmem_base_framework.framework_components,
mca_base_component_list_item_t) {
component = (mca_base_component_t *) cli->cli_component;
/* if there is a run-time query function then use it. otherwise, skip
* the component.
*/
if (NULL == ((opal_shmem_base_component_2_0_0_t *) component)->runtime_query) {
opal_output_verbose(5, opal_shmem_base_framework.framework_output,
"shmem: base: runtime_query: "
"(shmem) Skipping component [%s]. It does not "
"implement a run-time query function",
component->mca_component_name);
continue;
}
/* query this component for the module and priority */
opal_output_verbose(5, opal_shmem_base_framework.framework_output,
"shmem: base: runtime_query: "
"(shmem) Querying component (run-time) [%s]",
component->mca_component_name);
((opal_shmem_base_component_2_0_0_t *) component)
->runtime_query(&module, &priority, opal_shmem_base_RUNTIME_QUERY_hint);
/* if no module was returned, then skip component.
* this probably means that the run-time test deemed the shared memory
* backing facility unusable or unsafe.
*/
if (NULL == module) {
opal_output_verbose(5, opal_shmem_base_framework.framework_output,
"shmem: base: runtime_query: "
"(shmem) Skipping component [%s]. Run-time "
"Query failed to return a module",
component->mca_component_name);
continue;
}
/* determine if this is the best module we have seen by looking the
* priority
*/
opal_output_verbose(5, opal_shmem_base_framework.framework_output,
"shmem: base: runtime_query: "
"(%5s) Query of component [%s] set priority to %d",
"shmem", component->mca_component_name, priority);
if (priority > best_priority) {
best_priority = priority;
*best_module = module;
*best_component = component;
}
}
/* finished querying all components.
* make sure we found something in the process.
*/
if (NULL == *best_component) {
opal_output_verbose(5, opal_shmem_base_framework.framework_output,
"shmem: base: runtime_query: "
"(%5s) No component selected!",
"shmem");
return OPAL_ERR_NOT_FOUND;
}
opal_output_verbose(5, opal_shmem_base_framework.framework_output,
"shmem: base: runtime_query: "
"(%5s) Selected component [%s]",
"shmem", (*best_component)->mca_component_name);
/* close the non-selected components */
(void) mca_base_framework_components_close(&opal_shmem_base_framework,
(mca_base_component_t *) (*best_component));
/* save the winner */
opal_shmem_base_component = (opal_shmem_base_component_t *) *best_component;
opal_shmem_base_module = (opal_shmem_base_module_t *) *best_module;
opal_shmem_base_selected = true;
return OPAL_SUCCESS;
}
/* ////////////////////////////////////////////////////////////////////////// */
char *opal_shmem_base_best_runnable_component_name(void)
{
mca_base_component_t *best_component = NULL;
mca_base_module_t *best_module = NULL;
opal_output_verbose(10, opal_shmem_base_framework.framework_output,
"shmem: base: best_runnable_component_name: "
"Searching for best runnable component.");
/* select the best component so we can get its name. */
if (OPAL_SUCCESS != opal_shmem_base_runtime_query(&best_module, &best_component)) {
/* fail! */
return NULL;
} else {
if (NULL != best_component) {
opal_output_verbose(10, opal_shmem_base_framework.framework_output,
"shmem: base: best_runnable_component_name: "
"Found best runnable component: (%s).",
best_component->mca_component_name);
return strdup(best_component->mca_component_name);
} else {
opal_output_verbose(10, opal_shmem_base_framework.framework_output,
"shmem: base: best_runnable_component_name: "
"Could not find runnable component.");
/* no component returned, so return NULL */
return NULL;
}
}
}
/* ////////////////////////////////////////////////////////////////////////// */
int opal_shmem_base_select(void)
{
opal_shmem_base_component_2_0_0_t *best_component = NULL;
opal_shmem_base_module_2_0_0_t *best_module = NULL;
/* select the best component */
if (OPAL_SUCCESS
!= opal_shmem_base_runtime_query((mca_base_module_t **) &best_module,
(mca_base_component_t **) &best_component)) {
/* it is NOT okay if we don't find a module because we need at
* least one shared memory backing facility component instance.
*/
return OPAL_ERROR;
}
/* initialize the winner */
if (NULL != opal_shmem_base_module) {
return opal_shmem_base_module->module_init();
} else {
return OPAL_ERROR;
}
}
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