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/* Copyright (c) 2007-2025. 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/s4u.hpp>
namespace sg4 = simgrid::s4u;
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_comm_throttling, "Messages specific for this s4u example");
static void sender(sg4::Mailbox* mailbox)
{
XBT_INFO("Send at full bandwidth");
/* - First send a 2.5e8 Bytes payload at full bandwidth (1.25e8 Bps) */
auto* payload = new double(sg4::Engine::get_clock());
mailbox->put(payload, 2.5e8);
XBT_INFO("Throttle the bandwidth at the Comm level");
/* - ... then send it again but throttle the Comm */
payload = new double(sg4::Engine::get_clock());
/* get a handler on the comm first */
sg4::CommPtr comm = mailbox->put_init(payload, 2.5e8);
/* let throttle the communication. It amounts to set the rate of the comm to half the nominal bandwidth of the link,
* i.e., 1.25e8 / 2. This second communication will thus take approximately twice as long as the first one*/
comm->set_rate(1.25e8 / 2)->wait();
}
static void receiver(sg4::Mailbox* mailbox)
{
/* - Receive the first payload sent at full bandwidth */
auto sender_time = mailbox->get_unique<double>();
double communication_time = sg4::Engine::get_clock() - *sender_time;
XBT_INFO("Payload received (full bandwidth) in %f seconds", communication_time);
/* - ... Then receive the second payload sent with a throttled Comm */
sender_time = mailbox->get_unique<double>();
communication_time = sg4::Engine::get_clock() - *sender_time;
XBT_INFO("Payload received (throttled) in %f seconds", communication_time);
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
e.load_platform(argv[1]);
sg4::Mailbox* mbox = e.mailbox_by_name_or_create("Mailbox");
e.host_by_name("node-0.simgrid.org")->add_actor("sender", sender, mbox);
e.host_by_name("node-1.simgrid.org")->add_actor("receiver", receiver, mbox);
e.run();
return 0;
}
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