101 lines
3.2 KiB
C++
101 lines
3.2 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 <sys/uio.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/file_descriptor.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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// Create a 1GB file that will be read from at random positions. This should
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// invalid any performance gains from caching.
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const uint64_t kFileSize = 1ULL << 30;
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// How many bytes to write at once to initialize the file used to read from.
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const uint32_t kWriteSize = 65536;
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// Largest benchmarked read unit.
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const uint32_t kMaxRead = 1UL << 26;
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TempPath CreateFile(uint64_t file_size) {
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auto path = TempPath::CreateFile().ValueOrDie();
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FileDescriptor fd = Open(path.path(), O_WRONLY).ValueOrDie();
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// Try to minimize syscalls by using maximum size writev() requests.
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std::vector<char> buffer(kWriteSize);
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RandomizeBuffer(buffer.data(), buffer.size());
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const std::vector<std::vector<struct iovec>> iovecs_list =
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GenerateIovecs(file_size, buffer.data(), buffer.size());
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for (const auto& iovecs : iovecs_list) {
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TEST_CHECK(writev(fd.get(), iovecs.data(), iovecs.size()) >= 0);
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}
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return path;
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}
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// Global test state, initialized once per process lifetime.
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struct GlobalState {
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const TempPath tmpfile;
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explicit GlobalState(TempPath tfile) : tmpfile(std::move(tfile)) {}
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};
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GlobalState& GetGlobalState() {
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// This gets created only once throughout the lifetime of the process.
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// Use a dynamically allocated object (that is never deleted) to avoid order
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// of destruction of static storage variables issues.
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static GlobalState* const state =
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// The actual file size is the maximum random seek range (kFileSize) + the
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// maximum read size so we can read that number of bytes at the end of the
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// file.
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new GlobalState(CreateFile(kFileSize + kMaxRead));
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return *state;
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}
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void BM_RandRead(benchmark::State& state) {
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const int size = state.range(0);
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GlobalState& global_state = GetGlobalState();
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(global_state.tmpfile.path(), O_RDONLY));
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std::vector<char> buf(size);
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unsigned int seed = 1;
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for (auto _ : state) {
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TEST_CHECK(PreadFd(fd.get(), buf.data(), buf.size(),
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rand_r(&seed) % kFileSize) == size);
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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_RandRead)->Range(1, kMaxRead)->UseRealTime();
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} // namespace
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} // namespace testing
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} // namespace gvisor
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