458 строки
14 KiB
C
458 строки
14 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) 2004-2005 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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "mpi.h"
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#include "file/file.h"
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#include "opal/util/argv.h"
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#include "opal/util/output.h"
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#include "opal/class/opal_list.h"
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#include "opal/class/opal_object.h"
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#include "mca/mca.h"
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#include "mca/base/base.h"
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#include "mca/io/io.h"
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#include "mca/io/base/base.h"
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#include "mca/io/base/io_base_request.h"
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/*
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* Local types
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*/
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struct avail_io_t {
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opal_list_item_t super;
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mca_io_base_version_t ai_version;
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int ai_priority;
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mca_io_base_components_t ai_component;
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mca_io_base_modules_t ai_module;
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struct mca_io_base_file_t *ai_module_data;
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};
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typedef struct avail_io_t avail_io_t;
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/*
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* Local functions
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*/
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static opal_list_t *check_components(opal_list_t *components,
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ompi_file_t *file,
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char **names, int num_names);
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static avail_io_t *check_one_component(ompi_file_t *file,
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const mca_base_component_t *component);
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static avail_io_t *query(const mca_base_component_t *component,
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ompi_file_t *file);
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static avail_io_t *query_1_0_0(const mca_io_base_component_1_0_0_t *io_component,
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ompi_file_t *file);
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static void unquery(avail_io_t *avail, ompi_file_t *file);
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static int module_init(ompi_file_t *file);
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/*
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* Stuff for the OBJ interface
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*/
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static OBJ_CLASS_INSTANCE(avail_io_t, opal_list_item_t, NULL, NULL);
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/*
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* This function is called at the initialization time of every
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* file. It is used to select which io component will be
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* active for a given file.
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*/
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int mca_io_base_file_select(ompi_file_t *file,
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mca_base_component_t *preferred)
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{
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int err, num_names;
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char *names, **name_array;
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char *str;
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opal_list_t *selectable;
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opal_list_item_t *item;
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avail_io_t *avail, selected;
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/* Announce */
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opal_output_verbose(10, mca_io_base_output,
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"io:base:file_select: new file: %s",
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file->f_filename);
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/* Initialize all the relevant pointers, since they're used as
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sentinel values */
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file->f_io_version = MCA_IO_BASE_V_NONE;
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file->f_io_selected_data = NULL;
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/* See if a set of component was requested by the MCA parameter.
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Don't check for error. */
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names = NULL;
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mca_base_param_lookup_string(mca_io_base_param, &names);
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/* Compute the intersection of all of my available components with
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the components from all the other processes in this file */
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/* JMS CONTINUE HERE */
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/* See if a preferred component was provided. If so, try to
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select it. If we don't succeed, fall through and do a normal
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selection. */
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err = OMPI_ERROR;
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if (NULL != preferred) {
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str = &(preferred->mca_component_name[0]);
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opal_output_verbose(10, mca_io_base_output,
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"io:base:file_select: Checking preferred module: %s",
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str);
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selectable = check_components(&mca_io_base_components_available,
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file, &str, 1);
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/* If we didn't get a preferred module, then call again
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without a preferred module. This makes the logic below
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dramatically simpler. */
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if (NULL == selectable) {
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return mca_io_base_file_select(file, NULL);
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}
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/* We only fall through here if we were able to select one of
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the preferred modules */
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}
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/* If there was no preferred module, then see if there were any
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listed in the MCA parameter; parse them and check them all */
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else if (NULL != names && 0 < strlen(names)) {
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name_array = opal_argv_split(names, ',');
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num_names = opal_argv_count(name_array);
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opal_output_verbose(10, mca_io_base_output,
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"io:base:file_select: Checking specific modules: %s",
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names);
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selectable = check_components(&mca_io_base_components_available,
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file, name_array, num_names);
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opal_argv_free(name_array);
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}
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/* Nope -- a specific [set of] component[s] was not requested. Go
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check them all. */
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else {
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opal_output_verbose(10, mca_io_base_output,
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"io:base:file_select: Checking all available modules");
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selectable = check_components(&mca_io_base_components_available,
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file, NULL, 0);
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}
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/* Upon return from the above, the modules list will contain the
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list of modules that returned (priority >= 0). If we have no
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io modules available, it's an error */
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if (NULL == selectable) {
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/* There's no modules available. Doh! */
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/* show_help */
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return OMPI_ERROR;
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}
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/* Do some kind of collective operation to find a module that
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everyone has available */
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#if 1
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/* For the moment, just take the top module off the list */
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item = opal_list_remove_first(selectable);
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avail = (avail_io_t *) item;
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selected = *avail;
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OBJ_RELEASE(avail);
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#else
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/* JMS CONTINUE HERE */
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#endif
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/* Everything left in the selectable list is therefore unwanted,
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and we call their unquery() method (because they all had
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query() invoked, but will never have init() invoked in this
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scope). */
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for (item = opal_list_remove_first(selectable); item != NULL;
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item = opal_list_remove_first(selectable)) {
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avail = (avail_io_t *) item;
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unquery(avail, file);
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OBJ_RELEASE(item);
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}
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OBJ_RELEASE(selectable);
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/* Save the pointers of the selected module on the ompi_file_t */
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file->f_io_version = selected.ai_version;
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file->f_io_selected_component = selected.ai_component;
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file->f_io_selected_module = selected.ai_module;
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file->f_io_selected_data = selected.ai_module_data;
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/* Finally -- intialize the selected module. */
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if (OMPI_SUCCESS != (err = module_init(file))) {
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return err;
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}
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/* Add the component to the list of components that the io
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framework is maintaining */
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mca_io_base_component_add(&selected.ai_component);
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/* Announce the winner */
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opal_output_verbose(10, mca_io_base_output,
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"io:base:file_select: Selected io module %s",
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selected.ai_component.v1_0_0.io_version.mca_component_name);
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return OMPI_SUCCESS;
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}
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/*
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* For each component in the list, if it is in the list of names (or
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* the list of names is NULL), then check and see if it wants to run,
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* and do the resulting priority comparison. Make a list of
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* (component, module) tuples (of type avail_io_t) to be only those
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* who returned that they want to run, and put them in priority order.
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*/
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static opal_list_t *check_components(opal_list_t *components,
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ompi_file_t *file,
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char **names, int num_names)
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{
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int i;
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const mca_base_component_t *component;
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opal_list_item_t *item, *item2;
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bool want_to_check;
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opal_list_t *selectable;
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avail_io_t *avail, *avail2;
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/* Make a list of the components that query successfully */
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selectable = OBJ_NEW(opal_list_t);
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/* Scan through the list of components. This nested loop is
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O(N^2), but we should never have too many components and/or
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names, so this *hopefully* shouldn't matter... */
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for (item = opal_list_get_first(components);
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item != opal_list_get_end(components);
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item = opal_list_get_next(item)) {
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component = ((mca_base_component_priority_list_item_t *)
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item)->super.cli_component;
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/* If we have a list of names, scan through it */
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if (0 == num_names) {
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want_to_check = true;
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} else {
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want_to_check = false;
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for (i = 0; i < num_names; ++i) {
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if (0 == strcmp(names[i], component->mca_component_name)) {
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want_to_check = true;
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}
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}
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}
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/* If we determined that we want to check this component, then
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do so */
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if (want_to_check) {
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avail = check_one_component(file, component);
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if (NULL != avail) {
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/* Put this item on the list in priority order
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(highest priority first). Should it go first? */
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item2 = opal_list_get_first(selectable);
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avail2 = (avail_io_t *) item2;
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if (opal_list_get_end(selectable) == item2 ||
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avail->ai_priority > avail2->ai_priority) {
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opal_list_prepend(selectable, (opal_list_item_t*) avail);
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} else {
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for (i = 1; item2 != opal_list_get_end(selectable);
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item2 = opal_list_get_next(selectable), ++i) {
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avail2 = (avail_io_t *) item2;
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if (avail->ai_priority > avail2->ai_priority) {
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opal_list_insert(selectable,
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(opal_list_item_t *) avail, i);
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break;
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}
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}
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/* If we didn't find a place to put it in the
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list, then append it (because it has the lowest
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priority found so far) */
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if (opal_list_get_end(selectable) == item2) {
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opal_list_append(selectable,
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(opal_list_item_t *) avail);
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}
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}
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}
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}
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}
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/* If we didn't find any available components, return an error */
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if (0 == opal_list_get_size(selectable)) {
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OBJ_RELEASE(selectable);
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return NULL;
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}
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/* All done */
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return selectable;
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}
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/*
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* Check a single component
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*/
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static avail_io_t *check_one_component(ompi_file_t *file,
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const mca_base_component_t *component)
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{
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avail_io_t *avail;
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avail = query(component, file);
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if (NULL != avail) {
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avail->ai_priority = (avail->ai_priority < 100) ?
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avail->ai_priority : 100;
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avail->ai_priority = (avail->ai_priority < 0) ?
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0 : avail->ai_priority;
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opal_output_verbose(10, mca_io_base_output,
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"io:base:file_select: component available: %s, priority: %d",
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component->mca_component_name,
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avail->ai_priority);
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} else {
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opal_output_verbose(10, mca_io_base_output,
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"io:base:file_select: component not available: %s",
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component->mca_component_name);
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}
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return avail;
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}
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/**************************************************************************
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* Query functions
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**************************************************************************/
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/*
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* Take any version of a io module, query it, and return the right
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* module struct
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*/
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static avail_io_t *query(const mca_base_component_t *component,
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ompi_file_t *file)
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{
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const mca_io_base_component_1_0_0_t *ioc_100;
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/* io v1.0.0 */
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if (1 == component->mca_major_version &&
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0 == component->mca_minor_version &&
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0 == component->mca_release_version) {
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ioc_100 = (mca_io_base_component_1_0_0_t *) component;
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return query_1_0_0(ioc_100, file);
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}
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/* Unknown io API version -- return error */
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return NULL;
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}
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static avail_io_t *query_1_0_0(const mca_io_base_component_1_0_0_t *component,
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ompi_file_t *file)
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{
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int priority;
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avail_io_t *avail;
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const mca_io_base_module_1_0_0_t *module;
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struct mca_io_base_file_t *module_data;
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/* Query v1.0.0 */
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avail = NULL;
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module_data = NULL;
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module = component->io_file_query(file, &module_data, &priority);
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if (NULL != module) {
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avail = OBJ_NEW(avail_io_t);
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avail->ai_version = MCA_IO_BASE_V_1_0_0;
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avail->ai_priority = priority;
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avail->ai_component.v1_0_0 = *component;
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avail->ai_module.v1_0_0 = *module;
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avail->ai_module_data = module_data;
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}
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return avail;
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}
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/**************************************************************************
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* Unquery functions
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**************************************************************************/
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static void unquery(avail_io_t *avail, ompi_file_t *file)
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{
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const mca_io_base_component_1_0_0_t *ioc_100;
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switch(avail->ai_version) {
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case MCA_IO_BASE_V_1_0_0:
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ioc_100 = &(avail->ai_component.v1_0_0);
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ioc_100->io_file_unquery(file, avail->ai_module_data);
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break;
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default:
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break;
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}
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}
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/**************************************************************************
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* Module_Init functions
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**************************************************************************/
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/*
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* Initialize a module
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*/
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static int module_init(ompi_file_t *file)
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{
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const mca_io_base_module_1_0_0_t *iom_100;
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switch(file->f_io_version) {
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case MCA_IO_BASE_V_1_0_0:
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iom_100 = &(file->f_io_selected_module.v1_0_0);
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return iom_100->io_module_file_open(file->f_comm, file->f_filename,
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file->f_amode, file->f_info,
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file);
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break;
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default:
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return OMPI_ERROR;
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break;
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}
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/* No way to reach here */
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}
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