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// benchmark based on: http://cpp-next.com/archive/2010/10/howards-stl-move-semantics-benchmark/
//
// @file bench_static_vector.cpp
// @date Aug 14, 2011
// @author Andrew Hundt <ATHundt@gmail.com>
//
// (C) Copyright 2011-2013 Andrew Hundt <ATHundt@gmail.com>
// (C) Copyright 2013-2013 Ion Gaztanaga
//
// 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)
//
// @brief varray_benchmark.cpp compares the performance of boost::container::varray to boost::container::vector
#include "varray.hpp"
#include "boost/container/vector.hpp"
#include "boost/container/static_vector.hpp"
#include "../test/movable_int.hpp"
#include <vector>
#include <iostream>
#include <boost/timer/timer.hpp>
#include <algorithm>
#include <exception>
using boost::timer::cpu_timer;
using boost::timer::cpu_times;
using boost::timer::nanosecond_type;
static const std::size_t N = 500;
#ifdef NDEBUG
static const std::size_t Iter = 50;
#else
static const std::size_t Iter = 5;
#endif
//#define BENCH_SIMPLE_CONSTRUCTION
//#define BENCH_TRIVIAL_TYPE
#ifdef BENCH_TRIVIAL_TYPE
typedef std::size_t basic_type_t;
#else
typedef boost::container::test::copyable_int basic_type_t;
#endif
template<typename T>
T &get_set(std::size_t)
{
#ifdef BENCH_SIMPLE_CONSTRUCTION
T &t = *new T(N);
for (std::size_t i = 0; i < N; ++i)
t[i] = basic_type_t(std::rand());
#else
T &t = *new T;
t.reserve(N);
for (std::size_t i = 0; i < N; ++i)
t.push_back(basic_type_t(std::rand()));
#endif
return t;
}
template<typename T>
T &generate()
{
T &v = *new T;
v.reserve(N);
for (std::size_t i = 0; i < N; ++i){
typename T::reference r = get_set<typename T::value_type>(i);
v.push_back(boost::move(r));
delete &r;
}
return v;
}
template<typename T>
cpu_times time_it()
{
cpu_timer sortTime,rotateTime,destructionTime;
sortTime.stop();rotateTime.stop();destructionTime.stop();
cpu_timer totalTime, constructTime;
std::srand (0);
for(std::size_t i = 0; i< Iter; ++i){
constructTime.resume();
{
T &v = generate<T>();
constructTime.stop();
sortTime.resume();
std::sort(v.begin(), v.end());
sortTime.stop();
rotateTime.resume();
std::rotate(v.begin(), v.begin() + v.size()/2, v.end());
rotateTime.stop();
destructionTime.resume();
delete &v;
}
destructionTime.stop();
}
totalTime.stop();
std::cout << " construction took " << boost::timer::format(constructTime.elapsed(), 6, "%ws wall, %ts CPU (%p%)\n");
std::cout << " sort took " << boost::timer::format(sortTime.elapsed(), 6, "%ws wall, %ts CPU (%p%)\n");
std::cout << " rotate took " << boost::timer::format(rotateTime.elapsed(), 6, "%ws wall, %ts CPU (%p%)\n");
std::cout << " destruction took " << boost::timer::format(destructionTime.elapsed(), 6, "%ws wall, %ts CPU (%p%)\n");
std::cout << " Total time = " << boost::timer::format(totalTime.elapsed(), 6, "%ws wall, %ts CPU (%p%)\n") << std::endl;
return totalTime.elapsed();
}
void compare_times(cpu_times time_numerator, cpu_times time_denominator){
std::cout
<< "\n wall = " << ((double)time_numerator.wall/(double)time_denominator.wall)
<< "\n (user+sys) = " << ((double)(time_numerator.system+time_numerator.user)/(double)(time_denominator.system+time_denominator.user)) << "\n\n";
}
int main()
{
try {
std::cout << "N = " << N << " Iter = " << Iter << "\n\n";
std::cout << "varray benchmark:" << std::endl;
cpu_times time_varray = time_it<boost::container::varray<boost::container::varray<basic_type_t,N>,N > >();
std::cout << "boost::container::static_vector benchmark" << std::endl;
cpu_times time_boost_static_vector = time_it<boost::container::static_vector<boost::container::static_vector<basic_type_t,N>,N > >();
std::cout << "boost::container::vector benchmark" << std::endl;
cpu_times time_boost_vector = time_it<boost::container::vector<boost::container::vector<basic_type_t> > >();
std::cout << "std::vector benchmark" << std::endl;
cpu_times time_standard_vector = time_it<std::vector<std::vector<basic_type_t> > >();
std::cout << "varray/boost::container::vector total time comparison:";
compare_times(time_varray, time_boost_vector);
std::cout << "varray/boost::container::static_vector total time comparison:";
compare_times(time_varray, time_boost_static_vector);
std::cout << "varray/std::vector total time comparison:";
compare_times(time_varray,time_standard_vector);
}catch(std::exception &e){
std::cout << e.what();
}
return 0;
}
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