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// Copyright John Maddock 2015.
// Use, modification and distribution are subject to 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)
#ifndef PERFORMANCE_HPP
#define PERFORMANCE_HPP
#include <boost/math/special_functions/relative_difference.hpp>
#include <boost/array.hpp>
#include <boost/chrono.hpp>
#include <boost/regex.hpp>
#include <iostream>
#include <iomanip>
extern std::vector<std::vector<double> > data;
template <class Array>
void add_data(const Array& a)
{
//
// This function is called multiple times to merge multiple data sets into one big table:
//
for(typename Array::const_iterator i = a.begin(); i != a.end(); ++i)
{
data.push_back(std::vector<double>());
for(typename Array::value_type::const_iterator j = i->begin(); j != i->end(); ++j)
{
data.back().push_back(*j);
}
}
}
template <class Func, class Result>
void screen_data(Func f, Result r)
{
//
// If any of the implementations being tested produces garbage for one of our
// test cases (or else if we test a domain they don't support), then we remove that
// row from the table. This allows us to only test a common supported sub-set for performance:
//
for(std::vector<std::vector<double> >::size_type row = 0; row < data.size(); ++row)
{
try
{
double computed = f(data[row]);
double expected = r(data[row]);
double err = boost::math::relative_difference(computed, expected);
if(err > 1e-7)
{
std::cout << "Erasing row: ";
for(unsigned i = 0; i < data[row].size(); ++i)
{
std::cout << data[row][i] << " ";
}
std::cout << "Error was " << err << std::endl;
data.erase(data.begin() + row);
--row;
}
}
catch(const std::exception& e)
{
std::cout << "Erasing row: ";
for(unsigned i = 0; i < data[row].size(); ++i)
{
std::cout << data[row][i] << " ";
}
std::cout << "due to thrown exception: " << e.what() << std::endl;
data.erase(data.begin() + row);
--row;
}
}
}
template <class Clock>
struct stopwatch
{
typedef typename Clock::duration duration;
stopwatch()
{
m_start = Clock::now();
}
duration elapsed()
{
return Clock::now() - m_start;
}
void reset()
{
m_start = Clock::now();
}
private:
typename Clock::time_point m_start;
};
double sum = 0;
template <class Func>
double exec_timed_test(Func f)
{
double t = 0;
unsigned repeats = 1;
do{
stopwatch<boost::chrono::high_resolution_clock> w;
for(unsigned count = 0; count < repeats; ++count)
{
for(std::vector<std::vector<double> >::const_iterator i = data.begin(); i != data.end(); ++i)
sum += f(*i);
}
t = boost::chrono::duration_cast<boost::chrono::duration<double>>(w.elapsed()).count();
if(t < 0.5)
repeats *= 2;
} while(t < 0.5);
return t / (repeats * data.size());
}
#endif // PERFORMANCE_HPP
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