61 lines
1.5 KiB
C++
61 lines
1.5 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 <pthread.h>
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#include <time.h>
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#include "gtest/gtest.h"
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#include "absl/time/clock.h"
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#include "absl/time/time.h"
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#include "benchmark/benchmark.h"
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namespace gvisor {
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namespace testing {
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namespace {
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void BM_ClockGettimeThreadCPUTime(benchmark::State& state) {
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clockid_t clockid;
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ASSERT_EQ(0, pthread_getcpuclockid(pthread_self(), &clockid));
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struct timespec tp;
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for (auto _ : state) {
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clock_gettime(clockid, &tp);
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}
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}
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BENCHMARK(BM_ClockGettimeThreadCPUTime);
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void BM_VDSOClockGettime(benchmark::State& state) {
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const clockid_t clock = state.range(0);
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struct timespec tp;
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absl::Time start = absl::Now();
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// Don't benchmark the calibration phase.
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while (absl::Now() < start + absl::Milliseconds(2100)) {
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clock_gettime(clock, &tp);
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}
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for (auto _ : state) {
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clock_gettime(clock, &tp);
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}
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}
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BENCHMARK(BM_VDSOClockGettime)->Arg(CLOCK_MONOTONIC)->Arg(CLOCK_REALTIME);
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} // namespace
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} // namespace testing
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} // namespace gvisor
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