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filebuf_sputn_unbuf.cc: New, adapted from libstdc++/11378.

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2004-04-04  Paolo Carlini  <pcarlini@suse.de>
	    Petur Runolfsson  <peturr02@ru.is>

	* testsuite/performance/27_io/filebuf_sputn_unbuf.cc: New,
	adapted from libstdc++/11378.

Co-Authored-By: Petur Runolfsson <peturr02@ru.is>

From-SVN: r80398
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Paolo Carlini 2004-04-04 18:18:29 +00:00 committed by Paolo Carlini
parent 6060368e54
commit 9f35e4aab5
2 changed files with 88 additions and 0 deletions
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libstdc++-v3/ChangeLog
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2004-04-04 Paolo Carlini <pcarlini@suse.de>
Petur Runolfsson <peturr02@ru.is>
* testsuite/performance/27_io/filebuf_sputn_unbuf.cc: New,
adapted from libstdc++/11378.
2004-04-03 Paolo Carlini <pcarlini@suse.de>
* include/ext/mt_allocator.h (__mt_alloc<>::allocate): Factor out

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libstdc++-v3/testsuite/performance/27_io/filebuf_sputn_unbuf.cc Normal file
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// Copyright (C) 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.
#include <cstdio>
#include <fstream>
#include <testsuite_performance.h>
// libstdc++/11378
int main()
{
using namespace std;
using namespace __gnu_test;
time_counter time;
resource_counter resource;
const int iterations = 500000;
const int chunksize = 100;
char* chunk = new char[chunksize];
// C
FILE* file = fopen("tmp", "w+");
setvbuf(file, 0, _IONBF, 0);
start_counters(time, resource);
for (int i = 0; i < iterations; ++i)
fwrite(chunk, 1, chunksize, file);
stop_counters(time, resource);
fclose(file);
report_performance(__FILE__, "C", time, resource);
clear_counters(time, resource);
// C unlocked
file = fopen("tmp", "w+");
setvbuf(file, 0, _IONBF, 0);
start_counters(time, resource);
for (int i = 0; i < iterations; ++i)
fwrite_unlocked(chunk, 1, chunksize, file);
stop_counters(time, resource);
fclose(file);
report_performance(__FILE__, "C unlocked", time, resource);
clear_counters(time, resource);
// C++
filebuf buf;
buf.pubsetbuf(0, 0);
buf.open("tmp", ios_base::out | ios_base::in | ios_base::trunc);
start_counters(time, resource);
for (int i = 0; i < iterations; ++i)
buf.sputn(chunk, chunksize);
stop_counters(time, resource);
report_performance(__FILE__, "C++", time, resource);
unlink("tmp");
delete [] chunk;
return 0;
}