103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
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// Copyright Oliver Kowalke 2009.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <cstddef>
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#include <cstdlib>
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#include <iostream>
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#include <stdexcept>
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#include <boost/context/fiber.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/program_options.hpp>
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#include "../clock.hpp"
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#include "../cycle.hpp"
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boost::uint64_t jobs = 1000000;
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namespace ctx = boost::context;
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static ctx::fiber foo( ctx::fiber && f) {
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while ( true) {
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f = std::move( f).resume();
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}
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return ctx::fiber{};
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}
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duration_type measure_time() {
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// cache warum-up
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ctx::fiber f{ foo };
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f = std::move( f).resume();
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time_point_type start( clock_type::now() );
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for ( std::size_t i = 0; i < jobs; ++i) {
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f = std::move( f).resume();
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}
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duration_type total = clock_type::now() - start;
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total -= overhead_clock(); // overhead of measurement
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total /= jobs; // loops
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total /= 2; // 2x jump_fcontext
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return total;
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}
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#ifdef BOOST_CONTEXT_CYCLE
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cycle_type measure_cycles() {
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// cache warum-up
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ctx::fixedsize_stack alloc;
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ctx::fiber f{ std::allocator_arg, alloc, foo };
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f = std::move( f).resume();
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cycle_type start( cycles() );
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for ( std::size_t i = 0; i < jobs; ++i) {
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f = std::move( f).resume();
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}
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cycle_type total = cycles() - start;
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total -= overhead_cycle(); // overhead of measurement
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total /= jobs; // loops
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total /= 2; // 2x jump_fcontext
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return total;
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}
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#endif
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int main( int argc, char * argv[]) {
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try {
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boost::program_options::options_description desc("allowed options");
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desc.add_options()
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("help", "help message")
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("jobs,j", boost::program_options::value< boost::uint64_t >( & jobs), "jobs to run");
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boost::program_options::variables_map vm;
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boost::program_options::store(
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boost::program_options::parse_command_line(
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argc,
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argv,
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desc),
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vm);
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boost::program_options::notify( vm);
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if ( vm.count("help") ) {
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std::cout << desc << std::endl;
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return EXIT_SUCCESS;
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}
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boost::uint64_t res = measure_time().count();
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std::cout << "fiber: average of " << res << " nano seconds" << std::endl;
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#ifdef BOOST_CONTEXT_CYCLE
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res = measure_cycles();
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std::cout << "fiber: average of " << res << " cpu cycles" << std::endl;
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#endif
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return EXIT_SUCCESS;
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} catch ( std::exception const& e) {
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std::cerr << "exception: " << e.what() << std::endl;
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} catch (...) {
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std::cerr << "unhandled exception" << std::endl;
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}
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return EXIT_FAILURE;
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}
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