67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
// Copyright 2020 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "benchmark/benchmark.h"
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#include "test/util/logging.h"
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#include "test/util/temp_path.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// The maximum file size of the test file, when writes get beyond this point
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// they wrap around. This should be large enough to blow away caches.
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const uint64_t kMaxFile = 1 << 30;
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// Perform writes of various sizes sequentially to one file. Wraps around if it
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// goes above a certain maximum file size.
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void BM_SeqWrite(benchmark::State& state) {
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auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(f.path(), O_WRONLY));
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const int size = state.range(0);
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std::vector<char> buf(size);
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RandomizeBuffer(buf.data(), buf.size());
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// Start writes at offset 0.
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uint64_t offset = 0;
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for (auto _ : state) {
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TEST_CHECK(PwriteFd(fd.get(), buf.data(), buf.size(), offset) ==
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buf.size());
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offset += buf.size();
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// Wrap around if going above the maximum file size.
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if (offset >= kMaxFile) {
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offset = 0;
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}
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}
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state.SetBytesProcessed(static_cast<int64_t>(size) *
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static_cast<int64_t>(state.iterations()));
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}
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BENCHMARK(BM_SeqWrite)->Range(1, 1 << 26)->UseRealTime();
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} // namespace
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} // namespace testing
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} // namespace gvisor
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