* to mix interfaces, but it's not possible ATM).
*/
-int test(int argc, char *argv[]);
-msg_error_t test_all(const char *platform_file);
-/** Emitter function */
-int test(int argc, char *argv[])
+/** Function in charge of running the example (that's a simgrid process) */
+static int runner(int argc, char *argv[])
{
- xbt_dynar_t slaves_dynar;
- int slaves_count = 0;
- msg_host_t *slaves = NULL;
- double task_comp_size = 100000;
- double task_comm_size = 10000;
- double *computation_amount = NULL;
- double *communication_amount = NULL;
- msg_task_t ptask = NULL;
int i, j;
- slaves_dynar = MSG_hosts_as_dynar();
- slaves_count = xbt_dynar_length(slaves_dynar);
- slaves = xbt_dynar_to_array(slaves_dynar);
+ /* 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);
- computation_amount = xbt_new0(double, slaves_count);
- communication_amount = xbt_new0(double, slaves_count * slaves_count);
+ 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_amount[i] = task_comp_size;
+ computation_amounts[i] = 1e9; // 1 Gflop
for (i = 0; i < slaves_count; i++)
for (j = i + 1; j < slaves_count; j++)
- communication_amount[i * slaves_count + j] = task_comm_size;
+ communication_amounts[i * slaves_count + j] = 1e7; // 10 MB
- ptask = MSG_parallel_task_create("parallel task",
- slaves_count, slaves,
- computation_amount,
- communication_amount, NULL);
+ 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);
- /* There is no need to free that! */
-/* free(communication_amount); */
-/* free(computation_amount); */
+ free(remote);
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;
- xbt_dynar_t all_hosts;
- msg_host_t first_host;
-
+ MSG_init(&argc, argv);
MSG_config("host/model", "ptask_L07");
- MSG_create_environment(platform_file);
-
- all_hosts = MSG_hosts_as_dynar();
- first_host = xbt_dynar_getfirst_as(all_hosts,msg_host_t);
- MSG_process_create("test", test, NULL, first_host);
- res = MSG_main();
- xbt_dynar_free(&all_hosts);
- XBT_INFO("Simulation time %g", MSG_get_clock());
- return res;
-}
+ xbt_assert(argc > 1, "Usage: %s <platform file>", argv[0]);
+ MSG_create_environment(argv[1]);
-int main(int argc, char *argv[])
-{
- msg_error_t res = MSG_OK;
+ /* 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_init(&argc, argv);
- xbt_assert(argc > 1, "Usage: %s platform_file\n"
- "\tExample: %s msg_platform.xml", argv[0], argv[0]);
- res = test_all(argv[1]);
+ MSG_process_create("test", runner, NULL, first_host);
+ msg_error_t res = MSG_main();
+ XBT_INFO("Simulation done.");
return res != MSG_OK;
}
