/* 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. */
-/* This example shows how to block until the completion of a communication.
+/* This example shows how to start many asynchronous communications,
+ * and block on them later.
*/
- #include "simgrid/s4u.hpp"
- #include "xbt/str.h"
- #include <cstdlib>
- #include <iostream>
+#include "simgrid/s4u.hpp"
+#include "xbt/str.h"
+#include <cstdlib>
+#include <iostream>
XBT_LOG_NEW_DEFAULT_CATEGORY(msg_async_wait, "Messages specific for this s4u example");
class sender {
long messages_count; /* - number of tasks */
long receivers_count; /* - number of receivers */
- double sleep_start_time; /* - start time */
- double sleep_test_time; /* - test time */
- double msg_size; /* - computational cost */
- double task_comm_size; /* - communication cost */
+ double msg_size; /* - communication cost in bytes */
simgrid::s4u::MailboxPtr mbox;
public:
explicit sender(std::vector<std::string> args)
{
- xbt_assert(args.size() == 7, "The sender function expects 6 arguments from the XML deployment file");
+ xbt_assert(args.size() == 4, "The sender function expects 3 arguments from the XML deployment file");
messages_count = std::stol(args[1]);
- msg_size = std::stod(args[2]);
- task_comm_size = std::stod(args[3]);
- receivers_count = std::stol(args[4]);
- double sleep_start_time = std::stod(args[5]);
- double sleep_test_time = std::stod(args[6]);
- XBT_INFO("sleep_start_time : %f , sleep_test_time : %f", sleep_start_time, sleep_test_time);
+ msg_size = std::stod(args[2]);
+ receivers_count = std::stol(args[3]);
}
void operator()()
{
+ std::vector<simgrid::s4u::CommPtr>* pending_comms = new std::vector<simgrid::s4u::CommPtr>();
+
/* Start dispatching all messages to receivers, in a round robin fashion */
for (int i = 0; i < messages_count; i++) {
- char mailbox[80];
- char taskname[80];
std::string mbox_name = std::string("receiver-") + std::to_string(i % receivers_count);
mbox = simgrid::s4u::Mailbox::byName(mbox_name);
- snprintf(mailbox,79, "receiver-%ld", i % receivers_count);
- snprintf(taskname,79, "Task_%d", i);
/* Create a communication representing the ongoing communication */
- simgrid::s4u::CommPtr comm = mbox->put_async((void*)mailbox, msg_size);
+ std::string msgName = std::string("Message ") + std::to_string(i);
+ char* payload = xbt_strdup(msgName.c_str()); // copy the data we send: 'msgName' is not a stable storage location
+
+ simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, msg_size);
XBT_INFO("Send to receiver-%ld Task_%d", i % receivers_count, i);
- comm->wait(task_comm_size);
+ pending_comms->push_back(comm);
}
- /* Start sending messages to let the workers know that they should stop */
+
+ /* Now that all comms are in flight, wait for all of them (one after the other) */
+ for (int i = 0; i < messages_count; i++) {
+ while (not pending_comms->empty()) {
+ simgrid::s4u::CommPtr comm = pending_comms->back();
+ comm->wait(); // we could provide a timeout as a parameter
+ pending_comms->pop_back(); // remove it from the list
+ }
+ }
+
+ /* Start sending messages to let the workers know that they should stop (in a synchronous way) */
for (int i = 0; i < receivers_count; i++) {
char mailbox[80];
char* payload = xbt_strdup("finalize");
snprintf(mailbox, 79, "receiver-%d", i);
- simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, 0);
- comm->wait(task_comm_size);
+ mbox->put((void*)payload, 0); // instantaneous message (payload size is 0) sent in a synchronous way (with put)
XBT_INFO("Send to receiver-%d finalize", i);
}
}
};
-/* Receiver process expects 3 arguments: */
+/* Receiver process expects 1 arguments: its ID */
class receiver {
- int id; /* - unique id */
- double sleep_start_time; /* - start time */
- double sleep_test_time; /* - test time */
simgrid::s4u::MailboxPtr mbox;
public:
explicit receiver(std::vector<std::string> args)
{
- xbt_assert(args.size() == 4, "The relay_runner function does not accept any parameter from the XML deployment file");
- id = std::stoi(args[1]);
- sleep_start_time = std::stod(args[2]);
- sleep_test_time = std::stod(args[3]);
- XBT_INFO("sleep_start_time : %f , sleep_test_time : %f", sleep_start_time, sleep_test_time);
- std::string mbox_name = std::string("receiver-") + std::to_string(id);
- mbox = simgrid::s4u::Mailbox::byName(mbox_name);
+ xbt_assert(args.size() == 2, "The receiver function takes a unique parameter from the XML deployment file");
+ std::string mbox_name = std::string("receiver-") + args[1];
+ mbox = simgrid::s4u::Mailbox::byName(mbox_name);
}
void operator()()
{
- char mailbox[80];
- snprintf(mailbox,79, "receiver-%d", id);
while (1) {
- char* received = static_cast<char*>(mbox->get());
XBT_INFO("Wait to receive a task");
+ char* received = static_cast<char*>(mbox->get());
XBT_INFO("I got a '%s'.", received);
if (std::strcmp(received, "finalize") == 0) { /* If it's a finalize message, we're done */
xbt_free(received);
int main(int argc, char *argv[])
{
- simgrid::s4u::Engine* e = new simgrid::s4u::Engine(&argc, argv);
-
- xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
-
- e->registerFunction<sender>("sender");
- e->registerFunction<receiver>("receiver");
-
- e->loadPlatform(argv[1]);
- e->loadDeployment(argv[2]);
- e->run();
-
- return 0;
+ simgrid::s4u::Engine e(&argc, argv);
+
+ xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
+
+ e.registerFunction<sender>("sender");
+ e.registerFunction<receiver>("receiver");
+
+ e.loadPlatform(argv[1]);
+ e.loadDeployment(argv[2]);
+ e.run();
+
+ return 0;
}
