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
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "benchmark.h"
#include <stdio.h>
#define KB 1024
#define MB 1024*KB
#define AT_COMMON_SIZES \
Arg(1)->Arg(2)->Arg(3)->Arg(4)->Arg(8)->Arg(16)->Arg(32)->Arg(64)->Arg(512)-> \
Arg(1*KB)->Arg(4*KB)->Arg(8*KB)->Arg(16*KB)->Arg(64*KB)
template <typename Fn>
static void ReadWriteTest(int iters, int chunk_size, Fn f, bool buffered) {
StopBenchmarkTiming();
FILE* fp = fopen("/dev/zero", "rw");
char* buf = new char[chunk_size];
StartBenchmarkTiming();
if (!buffered) {
setvbuf(fp, 0, _IONBF, 0);
}
for (int i = 0; i < iters; ++i) {
f(buf, chunk_size, 1, fp);
}
StopBenchmarkTiming();
SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(chunk_size));
delete[] buf;
fclose(fp);
}
static void BM_stdio_fread(int iters, int chunk_size) {
ReadWriteTest(iters, chunk_size, fread, true);
}
BENCHMARK(BM_stdio_fread)->AT_COMMON_SIZES;
static void BM_stdio_fwrite(int iters, int chunk_size) {
ReadWriteTest(iters, chunk_size, fwrite, true);
}
BENCHMARK(BM_stdio_fwrite)->AT_COMMON_SIZES;
static void BM_stdio_fread_unbuffered(int iters, int chunk_size) {
ReadWriteTest(iters, chunk_size, fread, false);
}
BENCHMARK(BM_stdio_fread_unbuffered)->AT_COMMON_SIZES;
static void BM_stdio_fwrite_unbuffered(int iters, int chunk_size) {
ReadWriteTest(iters, chunk_size, fwrite, false);
}
BENCHMARK(BM_stdio_fwrite_unbuffered)->AT_COMMON_SIZES;
|
