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107 lines
3.0 KiB
C++
107 lines
3.0 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 <cstdlib>
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#include <iostream>
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#include <stdexcept>
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#include <string>
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#include <boost/atomic.hpp>
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#include <boost/chrono.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/program_options.hpp>
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#include <tbb/task.h>
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#include <tbb/task_scheduler_init.h>
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#include "../bind_processor.hpp"
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#include "../clock.hpp"
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boost::uint64_t jobs = 1000;
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struct worker: public tbb::task
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{
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tbb::task * execute()
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{ return 0; }
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};
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struct spawner : public tbb::task
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{
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tbb::task * execute()
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{
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set_ref_count( static_cast< int >( jobs + 1) );
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for ( boost::uint64_t i = 0; i < jobs; ++i)
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{
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worker & wrk = *new ( tbb::task::allocate_child() ) worker();
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if ( i == ( jobs - 1) )
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spawn_and_wait_for_all( wrk);
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else
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spawn( wrk);
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}
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return 0;
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}
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};
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duration_type measure( duration_type overhead)
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{
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time_point_type start( clock_type::now() );
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spawner & spw = *new ( tbb::task::allocate_root() ) spawner();
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tbb::task::spawn_root_and_wait( spw);
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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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return total;
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}
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int main( int argc, char * argv[])
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{
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try
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{
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bool preserve = false, bind = false, unwind = false;
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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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("bind,b", boost::program_options::value< bool >( & bind), "bind thread to CPU")
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("fpu,f", boost::program_options::value< bool >( & preserve), "preserve FPU registers")
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("unwind,u", boost::program_options::value< bool >( & unwind), "unwind fiber-stack")
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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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if ( bind) bind_to_processor( 0);
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tbb::task_scheduler_init init( 1);
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duration_type overhead = overhead_clock();
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std::cout << "overhead " << overhead.count() << " nano seconds" << std::endl;
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boost::uint64_t res = measure( overhead).count();
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std::cout << "average of " << res << " nano seconds" << std::endl;
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return EXIT_SUCCESS;
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}
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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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return EXIT_FAILURE;
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}
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