61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
/* boost nondet_random_speed.cpp performance test
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*
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* Copyright Jens Maurer 2000
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* Distributed under the Boost Software License, Version 1.0. (See
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* 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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*
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* $Id$
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*
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*/
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#include <iostream>
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#include <string>
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#include <boost/timer.hpp>
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#include <boost/random/random_device.hpp>
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// set to your CPU frequency
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static const double cpu_frequency = 1.87 * 1e9;
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static void show_elapsed(double end, int iter, const std::string & name)
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{
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double usec = end/iter*1e6;
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double cycles = usec * cpu_frequency/1e6;
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std::cout << name << ": "
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<< usec*1e3 << " nsec/loop = "
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<< cycles << " CPU cycles"
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<< std::endl;
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}
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template<class Result, class RNG>
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static void timing(RNG & rng, int iter, const std::string& name)
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{
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volatile Result tmp; // make sure we're not optimizing too much
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boost::timer t;
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for(int i = 0; i < iter; i++)
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tmp = rng();
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show_elapsed(t.elapsed(), iter, name);
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}
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template<class RNG>
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void run(int iter, const std::string & name)
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{
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RNG rng;
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timing<long>(rng, iter, name);
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}
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int main(int argc, char*argv[])
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{
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if(argc != 2) {
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std::cerr << "usage: " << argv[0] << " iterations" << std::endl;
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return 1;
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}
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int iter = std::atoi(argv[1]);
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boost::random::random_device dev;
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timing<unsigned int>(dev, iter, "random_device");
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return 0;
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}
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