X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/b6f58f8266d8c00c00ccce419b7e08e8eb8006b9..707b11fe424a58eb8e870fc71978568c58006a3e:/teshsuite/msg/energy-ptask/energy-ptask.c

diff --git a/teshsuite/msg/energy-ptask/energy-ptask.c b/teshsuite/msg/energy-ptask/energy-ptask.c
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+++ b/teshsuite/msg/energy-ptask/energy-ptask.c
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+/* Copyright (c) 2007-2017. 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 "simgrid/plugins/energy.h"
+#include "simgrid/msg.h"
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
+
+/** @addtogroup MSG_examples
+ *
+ * - <b>energy-ptask/energy-ptask.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).
+ */
+
+static int runner(int argc, char* argv[])
+{
+  /* Retrieve the list of all hosts as an array of hosts */
+  int hosts_count   = MSG_get_host_number();
+  msg_host_t* hosts = xbt_dynar_to_array(MSG_hosts_as_dynar());
+
+  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, hosts_count);
+  double* communication_amounts = xbt_new0(double, hosts_count* hosts_count);
+
+  for (int i               = 0; i < hosts_count; i++)
+    computation_amounts[i] = 1e9; // 1 Gflop
+
+  for (int i = 0; i < hosts_count; i++)
+    for (int j                                   = i + 1; j < hosts_count; j++)
+      communication_amounts[i * hosts_count + j] = 1e7; // 10 MB
+
+  msg_task_t ptask =
+      MSG_parallel_task_create("parallel task", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
+  MSG_parallel_task_execute(ptask);
+  MSG_task_destroy(ptask);
+  xbt_free(communication_amounts);
+  xbt_free(computation_amounts);
+
+  XBT_INFO("We can do the same with a timeout of one second enabled.");
+  computation_amounts   = xbt_new0(double, hosts_count);
+  communication_amounts = xbt_new0(double, hosts_count* hosts_count);
+  for (int i               = 0; i < hosts_count; i++)
+    computation_amounts[i] = 1e9; // 1 Gflop
+  for (int i = 0; i < hosts_count; i++)
+    for (int j                                   = i + 1; j < hosts_count; j++)
+      communication_amounts[i * hosts_count + j] = 1e7; // 10 MB
+  ptask =
+      MSG_parallel_task_create("parallel task", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
+  msg_error_t errcode = MSG_parallel_task_execute_with_timeout(ptask, 1 /* timeout (in seconds)*/);
+  xbt_assert(errcode == MSG_TIMEOUT, "Woops, this did not timeout as expected... Please report that bug.");
+  MSG_task_destroy(ptask);
+  xbt_free(communication_amounts);
+  xbt_free(computation_amounts);
+
+  XBT_INFO("Then, build a parallel task involving only computations and no communication (1 Gflop per node)");
+  computation_amounts = xbt_new0(double, hosts_count);
+  for (int i               = 0; i < hosts_count; i++)
+    computation_amounts[i] = 1e9; // 1 Gflop
+  ptask = MSG_parallel_task_create("parallel exec", hosts_count, hosts, computation_amounts, NULL /* no comm */, NULL);
+  MSG_parallel_task_execute(ptask);
+  MSG_task_destroy(ptask);
+  xbt_free(computation_amounts);
+
+  XBT_INFO("Then, build a parallel task with no computation nor communication (synchro only)");
+  computation_amounts   = xbt_new0(double, hosts_count);
+  communication_amounts = xbt_new0(double, hosts_count* hosts_count); /* memset to 0 by xbt_new0 */
+  ptask =
+      MSG_parallel_task_create("parallel sync", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
+  MSG_parallel_task_execute(ptask);
+  MSG_task_destroy(ptask);
+  xbt_free(communication_amounts);
+  xbt_free(computation_amounts);
+
+  XBT_INFO("Finally, trick the ptask to do a 'remote execution', on host %s", MSG_host_get_name(hosts[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]              = hosts[1];
+  ptask = MSG_parallel_task_create("remote exec", 1, remote, computation_amounts, NULL /* no comm */, NULL);
+  MSG_parallel_task_execute(ptask);
+  MSG_task_destroy(ptask);
+  xbt_free(remote);
+  xbt_free(computation_amounts);
+
+  XBT_INFO("Goodbye now!");
+  xbt_free(hosts);
+  return 0;
+}
+
+int main(int argc, char* argv[])
+{
+  MSG_init(&argc, argv);
+  MSG_config("host/model", "ptask_L07");
+
+  xbt_assert(argc <= 3, "1Usage: %s <platform file> [--energy]", argv[0]);
+  xbt_assert(argc >= 2, "2Usage: %s <platform file> [--energy]", argv[0]);
+
+  if (argc == 3 && argv[2][2] == 'e')
+    sg_host_energy_plugin_init();
+
+  MSG_create_environment(argv[1]);
+
+  /* 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);
+
+  MSG_process_create("test", runner, NULL, first_host);
+  msg_error_t res = MSG_main();
+  XBT_INFO("Simulation done.");
+
+  return res != MSG_OK;
+}