67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
|
// Copyright 2020 The gVisor Authors.
|
||
|
//
|
||
|
// 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 <fcntl.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <sys/stat.h>
|
||
|
#include <unistd.h>
|
||
|
|
||
|
#include "gtest/gtest.h"
|
||
|
#include "benchmark/benchmark.h"
|
||
|
#include "test/util/logging.h"
|
||
|
#include "test/util/temp_path.h"
|
||
|
#include "test/util/test_util.h"
|
||
|
|
||
|
namespace gvisor {
|
||
|
namespace testing {
|
||
|
|
||
|
namespace {
|
||
|
|
||
|
// The maximum file size of the test file, when writes get beyond this point
|
||
|
// they wrap around. This should be large enough to blow away caches.
|
||
|
const uint64_t kMaxFile = 1 << 30;
|
||
|
|
||
|
// Perform writes of various sizes sequentially to one file. Wraps around if it
|
||
|
// goes above a certain maximum file size.
|
||
|
void BM_SeqWrite(benchmark::State& state) {
|
||
|
auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
|
||
|
FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(f.path(), O_WRONLY));
|
||
|
|
||
|
const int size = state.range(0);
|
||
|
std::vector<char> buf(size);
|
||
|
RandomizeBuffer(buf.data(), buf.size());
|
||
|
|
||
|
// Start writes at offset 0.
|
||
|
uint64_t offset = 0;
|
||
|
for (auto _ : state) {
|
||
|
TEST_CHECK(PwriteFd(fd.get(), buf.data(), buf.size(), offset) ==
|
||
|
buf.size());
|
||
|
offset += buf.size();
|
||
|
// Wrap around if going above the maximum file size.
|
||
|
if (offset >= kMaxFile) {
|
||
|
offset = 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
state.SetBytesProcessed(static_cast<int64_t>(size) *
|
||
|
static_cast<int64_t>(state.iterations()));
|
||
|
}
|
||
|
|
||
|
BENCHMARK(BM_SeqWrite)->Range(1, 1 << 26)->UseRealTime();
|
||
|
|
||
|
} // namespace
|
||
|
|
||
|
} // namespace testing
|
||
|
} // namespace gvisor
|