mirror of
https://github.com/boostorg/coroutine.git
synced 2026-01-27 06:42:21 +00:00
120 lines
3.2 KiB
C++
120 lines
3.2 KiB
C++
|
|
// Copyright Oliver Kowalke 2009.
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// (See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#define BOOST_PP_LIMIT_MAG 10
|
|
|
|
#include <cstdio>
|
|
#include <cstdlib>
|
|
#include <iostream>
|
|
#include <stdexcept>
|
|
|
|
#include <boost/assert.hpp>
|
|
#include <boost/bind.hpp>
|
|
#include <boost/context/all.hpp>
|
|
#include <boost/coroutine/all.hpp>
|
|
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
|
|
|
|
#include "bind_processor.hpp"
|
|
#include "cycle.hpp"
|
|
#include "simple_stack_allocator.hpp"
|
|
|
|
#if _POSIX_C_SOURCE >= 199309L
|
|
#include "zeit.hpp"
|
|
#endif
|
|
|
|
namespace coro = boost::coroutines;
|
|
namespace ctx = boost::context;
|
|
|
|
typedef coro::coroutine< void() > coro_t;
|
|
|
|
#define COUNTER BOOST_PP_LIMIT_MAG
|
|
|
|
#define CALL_COROUTINE(z,n,unused) \
|
|
c();
|
|
|
|
void fn( coro_t::caller_type & c)
|
|
{ while ( true) c(); }
|
|
|
|
#ifdef BOOST_CONTEXT_CYCLE
|
|
cycle_t test_cycles( cycle_t ov, coro::flag_fpu_t preserve_fpu)
|
|
{
|
|
ctx::simple_stack_allocator< 8 * 1024 * 1024, 64 * 1024, 8 * 1024 > alloc;
|
|
coro_t c( fn, coro::attributes( preserve_fpu), alloc);
|
|
|
|
// cache warum-up
|
|
BOOST_PP_REPEAT_FROM_TO( 0, COUNTER, CALL_COROUTINE, ~)
|
|
|
|
cycle_t start( cycles() );
|
|
BOOST_PP_REPEAT_FROM_TO( 0, COUNTER, CALL_COROUTINE, ~)
|
|
cycle_t total( cycles() - start);
|
|
|
|
// we have two jumps and two measuremt-overheads
|
|
total -= ov; // overhead of measurement
|
|
total /= COUNTER; // per call
|
|
total /= 2; // 2x jump_to c1->c2 && c2->c1
|
|
|
|
return total;
|
|
}
|
|
#endif
|
|
|
|
#if _POSIX_C_SOURCE >= 199309L
|
|
zeit_t test_zeit( zeit_t ov, coro::flag_fpu_t preserve_fpu)
|
|
{
|
|
ctx::simple_stack_allocator< 8 * 1024 * 1024, 64 * 1024, 8 * 1024 > alloc;
|
|
coro_t c( fn, coro::attributes( preserve_fpu), alloc);
|
|
|
|
// cache warum-up
|
|
BOOST_PP_REPEAT_FROM_TO( 0, BOOST_PP_LIMIT_MAG, CALL_COROUTINE, ~)
|
|
|
|
zeit_t start( zeit() );
|
|
BOOST_PP_REPEAT_FROM_TO( 0, BOOST_PP_LIMIT_MAG, CALL_COROUTINE, ~)
|
|
zeit_t total( zeit() - start);
|
|
|
|
// we have two jumps and two measuremt-overheads
|
|
total -= ov; // overhead of measurement
|
|
total /= BOOST_PP_LIMIT_MAG; // per call
|
|
total /= 2; // 2x jump_to c1->c2 && c2->c1
|
|
|
|
return total;
|
|
}
|
|
#endif
|
|
|
|
int main( int argc, char * argv[])
|
|
{
|
|
try
|
|
{
|
|
coro::flag_fpu_t preserve_fpu = coro::fpu_not_preserved;
|
|
bind_to_processor( 0);
|
|
|
|
#ifdef BOOST_CONTEXT_CYCLE
|
|
{
|
|
cycle_t ov( overhead_cycles() );
|
|
std::cout << "overhead for rdtsc == " << ov << " cycles" << std::endl;
|
|
|
|
unsigned int res = test_cycles( ov, preserve_fpu);
|
|
std::cout << "coroutine: average of " << res << " cycles per switch" << std::endl;
|
|
}
|
|
#endif
|
|
|
|
#if _POSIX_C_SOURCE >= 199309L
|
|
{
|
|
zeit_t ov( overhead_zeit() );
|
|
std::cout << "\noverhead for clock_gettime() == " << ov << " ns" << std::endl;
|
|
|
|
unsigned int res = test_zeit( ov, preserve_fpu);
|
|
std::cout << "coroutine: average of " << res << " ns per switch" << std::endl;
|
|
}
|
|
#endif
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
catch ( std::exception const& e)
|
|
{ std::cerr << "exception: " << e.what() << std::endl; }
|
|
catch (...)
|
|
{ std::cerr << "unhandled exception" << std::endl; }
|
|
return EXIT_FAILURE;
|
|
}
|