examples/cpp/io-dependent/s4u-io-dependent.cpp

   1 /* Copyright (c) 2007-2023. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include "simgrid/s4u.hpp"
   7 #include <simgrid/plugins/file_system.h>
   8 #include <vector>
   9
  10 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_test, "Messages specific for this s4u example");
  11 namespace sg4 = simgrid::s4u;
  12
  13 static void test()
  14 {
  15   std::vector<sg4::ActivityPtr> pending_activities;
  16
  17   sg4::ExecPtr bob_compute = sg4::this_actor::exec_init(1e9);
  18   pending_activities.push_back(boost::dynamic_pointer_cast<sg4::Activity>(bob_compute));
  19   sg4::IoPtr bob_write = sg4::Host::current()->get_disks().front()->io_init(4000000, sg4::Io::OpType::WRITE);
  20   pending_activities.push_back(boost::dynamic_pointer_cast<sg4::Activity>(bob_write));
  21   sg4::IoPtr carl_read = sg4::Host::by_name("carl")->get_disks().front()->io_init(4000000, sg4::Io::OpType::READ);
  22   pending_activities.push_back(boost::dynamic_pointer_cast<sg4::Activity>(carl_read));
  23   sg4::ExecPtr carl_compute = sg4::Host::by_name("carl")->exec_init(1e9);
  24   pending_activities.push_back(boost::dynamic_pointer_cast<sg4::Activity>(carl_compute));
  25
  26   // Name the activities (for logging purposes only)
  27   bob_compute->set_name("bob compute");
  28   bob_write->set_name("bob write");
  29   carl_read->set_name("carl read");
  30   carl_compute->set_name("carl compute");
  31
  32   // Create the dependencies:
  33   // 'bob_write' is a successor of 'bob_compute'
  34   // 'carl_read' is a successor of 'bob_write'
  35   // 'carl_compute' is a successor of 'carl_read'
  36   bob_compute->add_successor(bob_write);
  37   bob_write->add_successor(carl_read);
  38   carl_read->add_successor(carl_compute);
  39
  40   // Start the activities.
  41   bob_compute->start();
  42   bob_write->start();
  43   carl_read->start();
  44   carl_compute->start();
  45
  46   // wait for the completion of all activities
  47   while (not pending_activities.empty()) {
  48     ssize_t changed_pos = sg4::Activity::wait_any(pending_activities);
  49     XBT_INFO("Activity '%s' is complete", pending_activities[changed_pos]->get_cname());
  50     pending_activities.erase(pending_activities.begin() + changed_pos);
  51   }
  52 }
  53
  54 int main(int argc, char* argv[])
  55 {
  56   sg4::Engine e(&argc, argv);
  57   e.load_platform(argv[1]);
  58
  59   sg4::Actor::create("bob", e.host_by_name("bob"), test);
  60
  61   e.run();
  62
  63   XBT_INFO("Simulation time %g", sg4::Engine::get_clock());
  64
  65   return 0;
  66 }