-/* $Id$ */
-
-/* Copyright (c) 2002,2003,2004 Arnaud Legrand. All rights reserved. */
+/* Copyright (c) 2007-2015. The SimGrid Team.
+ * All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include <stdio.h>
-#include "msg/msg.h" /* Yeah! If you want to use msg, you need to include msg/msg.h */
-#include "xbt/sysdep.h" /* calloc, printf */
+#include "simgrid/msg.h" /* Yeah! If you want to use msg, you need to include simgrid/msg.h */
+#include "xbt/sysdep.h" /* calloc, printf */
/* Create a log channel to have nice outputs. */
#include "xbt/log.h"
#include "xbt/asserts.h"
-XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test,"Messages specific for this msg example");
+XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test,
+ "Messages specific for this msg example");
+
+/** @addtogroup MSG_examples
+ *
+ * - <b>parallel_task/parallel_task.c</b>: Demonstrates the use of
+ * @ref MSG_parallel_task_create, to create special tasks that run
+ * on several hosts at the same time. The resulting simulations are
+ * very close to what can be achieved in @ref SD_API, but still
+ * allows to use the other features of MSG (it'd be cool to be able
+ * to mix interfaces, but it's not possible ATM).
+ */
+
+
+/** Function in charge of running the example (that's a simgrid process) */
+static int runner(int argc, char *argv[])
+{
+ int i, j;
-int test(int argc, char *argv[]);
-MSG_error_t test_all(const char *platform_file);
+ /* Retrieve the list of all hosts as an array of hosts */
+ xbt_dynar_t slaves_dynar = MSG_hosts_as_dynar();
+ int slaves_count = xbt_dynar_length(slaves_dynar);
+ msg_host_t *slaves = xbt_dynar_to_array(slaves_dynar);
-/** Emitter function */
-int test(int argc, char *argv[])
-{
- int slaves_count = 0;
- m_host_t *slaves = NULL;
- double task_comp_size = 100000;
- double task_comm_size = 10000;
- double *computation_amount = NULL;
- double *communication_amount = NULL;
- m_task_t ptask = NULL;
- int i,j;
-
- slaves_count = MSG_get_host_number();
- slaves = MSG_get_host_table();
-
- computation_amount = calloc(slaves_count,sizeof(double));
- communication_amount = calloc(slaves_count*slaves_count,sizeof(double));
-
- for(i=0;i<slaves_count;i++)
- computation_amount[i]=task_comp_size;
-
- for(i=0;i<slaves_count;i++)
- for(j=i+1;j<slaves_count;j++)
- communication_amount[i*slaves_count+j]=task_comm_size;
-
- ptask = MSG_parallel_task_create("parallel task",
- slaves_count, slaves,
- computation_amount,
- communication_amount,
- NULL);
+ XBT_INFO("First, build a classical parallel task, with 1 Gflop to execute on each node, and 10MB to exchange between each pair");
+ double *computation_amounts = xbt_new0(double, slaves_count);
+ double *communication_amounts = xbt_new0(double, slaves_count * slaves_count);
+
+ for (i = 0; i < slaves_count; i++)
+ computation_amounts[i] = 1e9; // 1 Gflop
+
+ for (i = 0; i < slaves_count; i++)
+ for (j = i + 1; j < slaves_count; j++)
+ communication_amounts[i * slaves_count + j] = 1e7; // 10 MB
+
+ msg_task_t ptask = MSG_parallel_task_create("parallel task",
+ slaves_count, slaves, computation_amounts, communication_amounts, NULL /* no specific data to attach */);
+ MSG_parallel_task_execute(ptask);
+ MSG_task_destroy(ptask);
+ /* The arrays communication_amounts and computation_amounts are not to be freed manually */
+
+ XBT_INFO("Then, build a parallel task involving only computations and no communication (1 Gflop per node)");
+ computation_amounts = xbt_new0(double, slaves_count);
+ for (i = 0; i < slaves_count; i++)
+ computation_amounts[i] = 1e9; // 1 Gflop
+ ptask = MSG_parallel_task_create("parallel exec", slaves_count, slaves, computation_amounts, NULL/* no comm */, NULL /* no data */);
MSG_parallel_task_execute(ptask);
+ MSG_task_destroy(ptask);
+
+ XBT_INFO("Finally, trick the ptask to do a 'remote execution', on host %s", MSG_host_get_name(slaves[1]));
+ computation_amounts = xbt_new0(double, 1);
+ computation_amounts[0] = 1e9; // 1 Gflop
+ msg_host_t *remote = xbt_new(msg_host_t,1);
+ remote[0] = slaves[1];
+ ptask = MSG_parallel_task_create("remote exec", 1, remote, computation_amounts, NULL/* no comm */, NULL /* no data */);
+ MSG_parallel_task_execute(ptask);
+ MSG_task_destroy(ptask);
+ free(remote);
-
- INFO0("Goodbye now!");
- free(communication_amount);
- free(computation_amount);
+ XBT_INFO("Goodbye now!");
free(slaves);
return 0;
-}
+}
-/** Test function */
-MSG_error_t test_all(const char *platform_file)
+int main(int argc, char *argv[])
{
- MSG_error_t res = MSG_OK;
+ MSG_init(&argc, argv);
+ MSG_config("host/model", "ptask_L07");
- /* MSG_config("workstation_model","KCCFLN05"); */
- MSG_set_channel_number(1);
- MSG_create_environment(platform_file);
+ xbt_assert(argc > 1, "Usage: %s <platform file>", argv[0]);
+ MSG_create_environment(argv[1]);
- MSG_process_create("test",test,NULL,MSG_get_host_table()[0]);
- res = MSG_main();
-
- INFO1("Simulation time %g",MSG_get_clock());
- return res;
-}
+ /* Pick a process, no matter which, from the platform file */
+ xbt_dynar_t all_hosts = MSG_hosts_as_dynar();
+ msg_host_t first_host = xbt_dynar_getfirst_as(all_hosts,msg_host_t);
+ xbt_dynar_free(&all_hosts);
-int main(int argc, char *argv[])
-{
- MSG_error_t res = MSG_OK;
-
- MSG_global_init(&argc,argv);
- if (argc < 2) {
- printf ("Usage: %s platform_file\n",argv[0]);
- printf ("example: %s msg_platform.xml\n",argv[0]);
- exit(1);
- }
- res = test_all(argv[1]);
- MSG_clean();
-
- if(res==MSG_OK)
- return 0;
- else
- return 1;
+ MSG_process_create("test", runner, NULL, first_host);
+ msg_error_t res = MSG_main();
+ XBT_INFO("Simulation done.");
+
+ return res != MSG_OK;
}
