/* boost nondet_random_speed.cpp performance test * * Copyright Jens Maurer 2000 * 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) * * $Id: nondet_random_speed.cpp 24096 2004-07-27 03:43:34Z dgregor $ * */ #include <iostream> #include <string> #include <boost/timer.hpp> #include <boost/nondet_random.hpp> // set to your CPU frequency in MHz static const double cpu_frequency = 200 * 1e6; static void show_elapsed(double end, int iter, const std::string & name) { double usec = end/iter*1e6; double cycles = usec * cpu_frequency/1e6; std::cout << name << ": " << usec*1e3 << " nsec/loop = " << cycles << " CPU cycles" << std::endl; } template<class Result, class RNG> static void timing(RNG & rng, int iter, const std::string& name) { volatile Result tmp; // make sure we're not optimizing too much boost::timer t; for(int i = 0; i < iter; i++) tmp = rng(); show_elapsed(t.elapsed(), iter, name); } template<class RNG> void run(int iter, const std::string & name) { RNG rng; timing<long>(rng, iter, name); } int main(int argc, char*argv[]) { if(argc != 2) { std::cerr << "usage: " << argv[0] << " iterations" << std::endl; return 1; } int iter = std::atoi(argv[1]); #ifdef __linux__ boost::random_device dev; timing<unsigned int>(dev, iter, "random_device"); #else #error The non-deterministic random device is currently available on Linux only. #endif return 0; }