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// 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
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