tests/benchmarks/scheduler-bench.cpp

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2023 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
 */

#define BOOST_TEST_MODULE ndn-cxx Scheduler Benchmark
#include "tests/boost-test.hpp"

#include "ndn-cxx/util/scheduler.hpp"
#include "tests/benchmarks/timed-execute.hpp"

#include <boost/asio/io_service.hpp>
#include <iostream>

namespace ndn::tests {

BOOST_AUTO_TEST_CASE(ScheduleCancel)
{
  boost::asio::io_service io;
  Scheduler sched(io);

  const size_t nEvents = 1000000;
  std::vector<scheduler::EventId> eventIds(nEvents);

  auto d1 = timedExecute([&] {
    for (size_t i = 0; i < nEvents; ++i) {
      eventIds[i] = sched.schedule(1_s, []{});
    }
  });

  auto d2 = timedExecute([&] {
    for (size_t i = 0; i < nEvents; ++i) {
      eventIds[i].cancel();
    }
  });

  std::cout << "schedule " << nEvents << " events: " << d1 << std::endl;
  std::cout << "cancel " << nEvents << " events: " << d2 << std::endl;
}

BOOST_AUTO_TEST_CASE(Execute)
{
  boost::asio::io_service io;
  Scheduler sched(io);

  const size_t nEvents = 1000000;
  size_t nExpired = 0;

  // Events should expire at t1, but execution finishes at t2. The difference is the overhead.
  time::steady_clock::time_point t1 = time::steady_clock::now() + 5_s;
  time::steady_clock::time_point t2;
  // +1ms ensures this extra event is executed last. In case the overhead is less than 1ms,
  // it will be reported as 1ms.
  sched.schedule(t1 - time::steady_clock::now() + 1_ms, [&] {
    t2 = time::steady_clock::now();
    BOOST_REQUIRE_EQUAL(nExpired, nEvents);
  });

  for (size_t i = 0; i < nEvents; ++i) {
    sched.schedule(t1 - time::steady_clock::now(), [&] { ++nExpired; });
  }

  io.run();

  BOOST_REQUIRE_EQUAL(nExpired, nEvents);
  std::cout << "execute " << nEvents << " events: " << (t2 - t1) << std::endl;
}

} // namespace ndn::tests