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// Copyright (C) 2003, 2004 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/*
* The goal with this application is to compare the performance
* between different std::allocator implementations. The results are
* influenced by the underlying allocator in the "C" library, malloc.
*/
// 2003-02-05 Stefan Olsson <stefan@snon.net>
#include <vector>
#include <list>
#include <typeinfo>
#include <sstream>
#include <ext/mt_allocator.h>
#include <ext/malloc_allocator.h>
#include <testsuite_performance.h>
using namespace std;
using __gnu_cxx::malloc_allocator;
using __gnu_cxx::__mt_alloc;
typedef int test_type;
// The number of iterations to be performed.
int iterations;
// The number of values to insert in the container, 32 will cause 5
// (re)allocations to be performed (sizes 4, 8, 16, 32 and 64)
// This means that all allocations are within _MAX_BYTES = 128 as
// defined in stl_alloc.h for __pool_alloc. Whether or not this
// value is relevant in "the real world" or not I don't know and
// should probably be investigated in more detail.
int insert_values = 128;
template<typename Container>
int
do_loop()
{
int test_iterations = 0;
try
{
Container obj;
while (test_iterations < iterations)
{
for (int j = 0; j < insert_values; ++j)
obj.push_back(test_iterations);
++test_iterations;
}
}
catch(...)
{
// No point allocating all available memory, repeatedly.
}
return test_iterations;
}
template<typename Container>
void
calibrate_iterations()
{
int try_iterations = iterations = 100000;
int test_iterations;
__gnu_test::time_counter timer;
timer.start();
test_iterations = do_loop<Container>();
timer.stop();
if (try_iterations > test_iterations && test_iterations > iterations)
iterations = test_iterations - 100;
else
{
double tics = timer.real_time();
double iterpc = test_iterations / tics; //iterations per clock
double xtics = 200; // works for linux 2gig x86
iterations = static_cast<int>(xtics * iterpc);
}
}
template<typename Container>
void
test_container(Container obj)
{
using namespace __gnu_test;
time_counter time;
resource_counter resource;
clear_counters(time, resource);
start_counters(time, resource);
int test_iterations = do_loop<Container>();
stop_counters(time, resource);
std::ostringstream comment;
comment << "iterations: " << test_iterations << '\t';
comment << "type: " << typeid(obj).name();
report_header(__FILE__, comment.str());
report_performance(__FILE__, string(), time, resource);
}
// http://gcc.gnu.org/ml/libstdc++/2001-05/msg00105.html
// http://gcc.gnu.org/ml/libstdc++/2003-05/msg00231.html
int main(void)
{
calibrate_iterations<vector<test_type> >();
test_container(vector<test_type>());
test_container(vector<test_type, malloc_allocator<test_type> >());
//test_container(vector<test_type, __mt_alloc<test_type> >());
calibrate_iterations<list<test_type> >();
test_container(list<test_type>());
test_container(list<test_type, malloc_allocator<test_type> >());
//test_container(list<test_type, __mt_alloc<test_type> >());
return 0;
}
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