1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
// Copyright (C) 2004-2019 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 3, 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 COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include <unistd.h>
#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;
}
|
