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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"
#include <vector>
constexpr unsigned PIECE_SIZE = 65536;
constexpr unsigned MESSAGE_BUILD_CHAIN_SIZE = 40;
constexpr unsigned MESSAGE_SEND_DATA_HEADER_SIZE = 1;
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_chainsend, "Messages specific for chainsend");
namespace sg4 = simgrid::s4u;
class ChainMessage {
public:
sg4::Mailbox* prev_ = nullptr;
sg4::Mailbox* next_ = nullptr;
unsigned int num_pieces = 0;
explicit ChainMessage(sg4::Mailbox* prev, sg4::Mailbox* next, const unsigned int num_pieces)
: prev_(prev), next_(next), num_pieces(num_pieces)
{
}
};
class FilePiece {
public:
FilePiece() = default;
};
class Peer {
public:
sg4::Mailbox* prev = nullptr;
sg4::Mailbox* next = nullptr;
sg4::Mailbox* me = nullptr;
sg4::ActivitySet pending_recvs;
sg4::ActivitySet pending_sends;
unsigned long long received_bytes = 0;
unsigned int received_pieces = 0;
unsigned int total_pieces = 0;
Peer() { me = sg4::Mailbox::by_name(sg4::Host::current()->get_cname()); }
void joinChain()
{
auto msg = me->get_unique<ChainMessage>();
prev = msg->prev_;
next = msg->next_;
total_pieces = msg->num_pieces;
XBT_DEBUG("Peer %s got a 'BUILD_CHAIN' message (prev: %s / next: %s)", me->get_cname(),
prev ? prev->get_cname() : nullptr, next ? next->get_cname() : nullptr);
}
void forwardFile()
{
FilePiece* received;
bool done = false;
while (not done) {
sg4::CommPtr comm = me->get_async<FilePiece>(&received);
pending_recvs.push(comm);
auto completed_one = pending_recvs.wait_any();
if (completed_one != nullptr) {
comm = boost::dynamic_pointer_cast<sg4::Comm>(completed_one);
XBT_DEBUG("Peer %s got a 'SEND_DATA' message", me->get_cname());
if (next != nullptr) {
XBT_DEBUG("Sending (asynchronously) from %s to %s", me->get_cname(), next->get_cname());
sg4::CommPtr send = next->put_async(received, MESSAGE_SEND_DATA_HEADER_SIZE + PIECE_SIZE);
pending_sends.push(send);
} else
delete received;
received_pieces++;
received_bytes += PIECE_SIZE;
XBT_DEBUG("%u pieces received, %llu bytes received", received_pieces, received_bytes);
if (received_pieces >= total_pieces) {
done = true;
}
}
}
}
};
class Broadcaster {
public:
sg4::Mailbox* first = nullptr;
std::vector<sg4::Mailbox*> mailboxes;
unsigned int piece_count;
void buildChain()
{
/* Build the chain if there's at least one peer */
if (not mailboxes.empty())
first = mailboxes.front();
for (unsigned i = 0; i < mailboxes.size(); i++) {
sg4::Mailbox* prev = i > 0 ? mailboxes[i - 1] : nullptr;
sg4::Mailbox* next = i < mailboxes.size() - 1 ? mailboxes[i + 1] : nullptr;
XBT_DEBUG("Building chain--broadcaster:\"%s\" dest:\"%s\" prev:\"%s\" next:\"%s\"",
sg4::Host::current()->get_cname(), mailboxes[i]->get_cname(), prev ? prev->get_cname() : nullptr,
next ? next->get_cname() : nullptr);
/* Send message to current peer */
mailboxes[i]->put(new ChainMessage(prev, next, piece_count), MESSAGE_BUILD_CHAIN_SIZE);
}
}
void sendFile()
{
sg4::ActivitySet pending_sends;
for (unsigned int current_piece = 0; current_piece < piece_count; current_piece++) {
XBT_DEBUG("Sending (send) piece %u from %s into mailbox %s", current_piece, sg4::Host::current()->get_cname(),
first->get_cname());
sg4::CommPtr comm = first->put_async(new FilePiece(), MESSAGE_SEND_DATA_HEADER_SIZE + PIECE_SIZE);
pending_sends.push(comm);
}
pending_sends.wait_all();
}
Broadcaster(int hostcount, unsigned int piece_count) : piece_count(piece_count)
{
for (int i = 1; i <= hostcount; i++) {
std::string name = "node-" + std::to_string(i) + ".simgrid.org";
XBT_DEBUG("%s", name.c_str());
mailboxes.push_back(sg4::Mailbox::by_name(name));
}
}
};
static void peer()
{
XBT_DEBUG("peer");
Peer p;
double start_time = sg4::Engine::get_clock();
p.joinChain();
p.forwardFile();
p.pending_sends.wait_all();
double end_time = sg4::Engine::get_clock();
XBT_INFO("### %f %llu bytes (Avg %f MB/s); copy finished (simulated).", end_time - start_time, p.received_bytes,
p.received_bytes / 1024.0 / 1024.0 / (end_time - start_time));
}
static void broadcaster(int hostcount, unsigned int piece_count)
{
XBT_DEBUG("broadcaster");
Broadcaster bc(hostcount, piece_count);
bc.buildChain();
bc.sendFile();
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
e.load_platform(argv[1]);
e.host_by_name("node-0.simgrid.org")->add_actor("broadcaster", broadcaster, 8, 256);
e.host_by_name("node-1.simgrid.org")->add_actor("peer", peer);
e.host_by_name("node-2.simgrid.org")->add_actor("peer", peer);
e.host_by_name("node-3.simgrid.org")->add_actor("peer", peer);
e.host_by_name("node-4.simgrid.org")->add_actor("peer", peer);
e.host_by_name("node-5.simgrid.org")->add_actor("peer", peer);
e.host_by_name("node-6.simgrid.org")->add_actor("peer", peer);
e.host_by_name("node-7.simgrid.org")->add_actor("peer", peer);
e.host_by_name("node-8.simgrid.org")->add_actor("peer", peer);
e.run();
XBT_INFO("Total simulation time: %e", e.get_clock());
return 0;
}
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