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// Copyright (C) 2004, 2005 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.
*/
#include <set>
#include <sstream>
using namespace std;
typedef int test_type;
// The number of iterations to be performed.
int iterations = 10000;
// 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 TestType>
struct value_type : public pair<TestType, TestType>
{
value_type() : pair<TestType, TestType>(0, 0) { }
inline value_type operator++() { return ++this->first, *this; }
inline operator TestType() const { return this->first; }
};
template<typename Container>
void
do_loop()
{
Container obj;
int test_iterations = 0;
value_type<test_type> test_value;
while (test_iterations < iterations)
{
for (int j = 0; j < insert_values; ++j)
obj.insert(obj.end(), ++test_value);
++test_iterations;
}
}
template<typename Container>
void
test_container(Container obj, bool run_threaded = false)
{
do_loop<Container>();
std::ostringstream comment;
if (run_threaded)
comment << "4-way threaded iterations: " << iterations*4 << '\t';
else
comment << "iterations: " << iterations << '\t';
}
// http://gcc.gnu.org/ml/libstdc++/2001-05/msg00105.html
// http://gcc.gnu.org/ml/libstdc++/2003-05/msg00231.html
int main(void)
{
typedef less<test_type> compare_type;
test_container(set<test_type, compare_type>());
return 0;
}
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