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Benchmark fread/fwrite both buffered and unbuffered.

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Bug: 18556607
Change-Id: I53905aedcea75fe550d9c423fb701c2c9bf8e831
This commit is contained in:
Elliott Hughes 2014-12-01 13:12:18 -08:00
parent 3e6ef3f902
commit 47dc7c974e
1 changed files with 22 additions and 16 deletions
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38
benchmarks/stdio_benchmark.cpp
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@ -25,14 +25,19 @@
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)
static void BM_stdio_fread(int iters, int chunk_size) {
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) {
fread(buf, chunk_size, 1, fp);
f(buf, chunk_size, 1, fp);
}
StopBenchmarkTiming();
@ -40,22 +45,23 @@ static void BM_stdio_fread(int iters, int 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) {
StopBenchmarkTiming();
FILE* fp = fopen("/dev/zero", "rw");
char* buf = new char[chunk_size];
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
fwrite(buf, chunk_size, 1, fp);
}
StopBenchmarkTiming();
SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(chunk_size));
delete[] buf;
fclose(fp);
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;