SimGrid  3.20
Versatile Simulation of Distributed Systems
/* Copyright (c) 2010-2018. 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/msg.h"
XBT_LOG_NEW_DEFAULT_CATEGORY(msg_trace_masterworker, "Messages specific for this msg example");
static int master(int argc, char *argv[])
long number_of_tasks = xbt_str_parse_int(argv[1], "Invalid amount of tasks: %s");
double task_comp_size = xbt_str_parse_double(argv[2], "Invalid computational size: %s");
double task_comm_size = xbt_str_parse_double(argv[3], "Invalid communication size: %s");
long workers_count = xbt_str_parse_int(argv[4], "Invalid amount of workers: %s");
//setting the variable "is_master" (previously declared) to value 1
TRACE_mark("msmark", "start_send_tasks");
for (int i = 0; i < number_of_tasks; i++) {
msg_task_t task = MSG_task_create("task", task_comp_size, task_comm_size, NULL);
//setting the variable "task_creation" to value i
//setting the category of task to "compute"
//the category of a task must be defined before it is sent or executed
MSG_task_set_category(task, "compute");
MSG_task_send(task, "master_mailbox");
TRACE_mark("msmark", "finish_send_tasks");
for (int i = 0; i < workers_count; i++) {
msg_task_t finalize = MSG_task_create("finalize", 0, 0, 0);
MSG_task_set_category(finalize, "finalize");
MSG_task_send(finalize, "master_mailbox");
return 0;
static int worker(int argc, char *argv[])
msg_task_t task = NULL;
while (1) {
MSG_task_receive(&(task), "master_mailbox");
if (strcmp(MSG_task_get_name(task), "finalize") == 0) {
// adding the value returned by MSG_task_get_compute_duration(task) to the variable "task_computation"
task = NULL;
return 0;
int main(int argc, char *argv[])
MSG_init(&argc, argv);
xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n"
"\tExample: %s msg_platform.xml msg_deployment.xml\n", argv[0], argv[0]);
//declaring user variables
//declaring user markers and values
TRACE_declare_mark_value ("msmark", "start_send_tasks");
TRACE_declare_mark_value ("msmark", "finish_send_tasks");
//declaring user categories with RGB colors (values from 0 to 1)
TRACE_category_with_color ("compute", "1 0 0"); //compute is red
TRACE_category_with_color ("finalize", "0 1 0"); //finalize is green
//categories without user-defined colors receive random colors generated by the tracing system
TRACE_category ("request");
TRACE_category_with_color ("report", NULL);
MSG_function_register("master", master);
MSG_function_register("worker", worker);
unsigned int cursor;
if (categories){
XBT_INFO ("Declared tracing categories:");
char *category;
xbt_dynar_foreach (categories, cursor, category){
XBT_INFO ("%s", category);
xbt_dynar_free (&categories);
if (marks){
XBT_INFO ("Declared marks:");
char *mark;
xbt_dynar_foreach (marks, cursor, mark){
XBT_INFO ("%s", mark);
xbt_dynar_free (&marks);
return 0;