github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/perf/linux/pipe_benchmark.cc (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include <stdlib.h>
    16  #include <sys/stat.h>
    17  #include <unistd.h>
    18  
    19  #include <cerrno>
    20  
    21  #include "gtest/gtest.h"
    22  #include "benchmark/benchmark.h"
    23  #include "test/util/logging.h"
    24  #include "test/util/test_util.h"
    25  #include "test/util/thread_util.h"
    26  
    27  namespace gvisor {
    28  namespace testing {
    29  
    30  namespace {
    31  
    32  void BM_Pipe(benchmark::State& state) {
    33    int fds[2];
    34    TEST_CHECK(pipe(fds) == 0);
    35  
    36    const int size = state.range(0);
    37    std::vector<char> wbuf(size);
    38    std::vector<char> rbuf(size);
    39    RandomizeBuffer(wbuf.data(), size);
    40  
    41    ScopedThread t([&] {
    42      auto const fd = fds[1];
    43      for (int i = 0; i < state.max_iterations; i++) {
    44        TEST_CHECK(WriteFd(fd, wbuf.data(), wbuf.size()) == size);
    45      }
    46    });
    47  
    48    for (auto _ : state) {
    49      TEST_CHECK(ReadFd(fds[0], rbuf.data(), rbuf.size()) == size);
    50    }
    51  
    52    t.Join();
    53  
    54    close(fds[0]);
    55    close(fds[1]);
    56  
    57    state.SetBytesProcessed(static_cast<int64_t>(size) *
    58                            static_cast<int64_t>(state.iterations()));
    59  }
    60  
    61  BENCHMARK(BM_Pipe)->Range(1, 1 << 20)->UseRealTime();
    62  
    63  }  // namespace
    64  
    65  }  // namespace testing
    66  }  // namespace gvisor