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// Copyright 2022 The Abseil 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
//
// https://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 "absl/base/attributes.h"
#include "absl/base/log_severity.h"
#include "absl/flags/flag.h"
#include "absl/log/check.h"
#include "absl/log/globals.h"
#include "absl/log/internal/flags.h"
#include "absl/log/log.h"
#include "absl/log/log_entry.h"
#include "absl/log/log_sink.h"
#include "absl/log/log_sink_registry.h"
#include "absl/log/vlog_is_on.h"
#include "benchmark/benchmark.h"
namespace {
class NullLogSink : public absl::LogSink {
public:
NullLogSink() { absl::AddLogSink(this); }
~NullLogSink() override { absl::RemoveLogSink(this); }
void Send(const absl::LogEntry&) override {}
};
constexpr int x = -1;
void BM_SuccessfulBinaryCheck(benchmark::State& state) {
int n = 0;
while (state.KeepRunningBatch(8)) {
CHECK_GE(n, x);
CHECK_GE(n, x);
CHECK_GE(n, x);
CHECK_GE(n, x);
CHECK_GE(n, x);
CHECK_GE(n, x);
CHECK_GE(n, x);
CHECK_GE(n, x);
++n;
}
benchmark::DoNotOptimize(n);
}
BENCHMARK(BM_SuccessfulBinaryCheck);
static void BM_SuccessfulUnaryCheck(benchmark::State& state) {
int n = 0;
while (state.KeepRunningBatch(8)) {
CHECK(n >= x);
CHECK(n >= x);
CHECK(n >= x);
CHECK(n >= x);
CHECK(n >= x);
CHECK(n >= x);
CHECK(n >= x);
CHECK(n >= x);
++n;
}
benchmark::DoNotOptimize(n);
}
BENCHMARK(BM_SuccessfulUnaryCheck);
static void BM_DisabledLogOverhead(benchmark::State& state) {
absl::ScopedStderrThreshold disable_stderr_logging(
absl::LogSeverityAtLeast::kInfinity);
absl::log_internal::ScopedMinLogLevel scoped_min_log_level(
absl::LogSeverityAtLeast::kInfinity);
for (auto _ : state) {
LOG(INFO);
}
}
BENCHMARK(BM_DisabledLogOverhead);
static void BM_EnabledLogOverhead(benchmark::State& state) {
absl::ScopedStderrThreshold stderr_logging(
absl::LogSeverityAtLeast::kInfinity);
absl::log_internal::ScopedMinLogLevel scoped_min_log_level(
absl::LogSeverityAtLeast::kInfo);
ABSL_ATTRIBUTE_UNUSED NullLogSink null_sink;
for (auto _ : state) {
LOG(INFO);
}
}
BENCHMARK(BM_EnabledLogOverhead);
static void BM_VlogIsOnOverhead(benchmark::State& state) {
// It would make sense to do this only when state.thread_index == 0,
// but thread_index is an int on some platforms (e.g. Android) and a
// function returning an int on others. So we just do it on all threads.
// TODO(b/152609127): set only if thread_index == 0.
absl::SetFlag(&FLAGS_v, 0);
while (state.KeepRunningBatch(10)) {
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 1
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 2
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 3
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 4
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 5
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 6
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 7
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 8
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 9
benchmark::DoNotOptimize(VLOG_IS_ON(0)); // 10
}
}
BENCHMARK(BM_VlogIsOnOverhead)->ThreadRange(1, 64);
static void BM_VlogIsNotOnOverhead(benchmark::State& state) {
// It would make sense to do this only when state.thread_index == 0,
// but thread_index is an int on some platforms (e.g. Android) and a
// function returning an int on others. So we just do it on all threads.
// TODO(b/152609127): set only if thread_index == 0.
absl::SetFlag(&FLAGS_v, 0);
while (state.KeepRunningBatch(10)) {
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 1
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 2
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 3
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 4
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 5
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 6
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 7
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 8
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 9
benchmark::DoNotOptimize(VLOG_IS_ON(1)); // 10
}
}
BENCHMARK(BM_VlogIsNotOnOverhead)->ThreadRange(1, 64);
static void BM_LogEveryNOverhead(benchmark::State& state) {
absl::ScopedStderrThreshold disable_stderr_logging(
absl::LogSeverityAtLeast::kInfinity);
absl::SetMinLogLevel(absl::LogSeverityAtLeast::kInfinity);
ABSL_ATTRIBUTE_UNUSED NullLogSink null_sink;
while (state.KeepRunningBatch(10)) {
LOG_EVERY_N_SEC(INFO, 10);
LOG_EVERY_N_SEC(INFO, 20);
LOG_EVERY_N_SEC(INFO, 30);
LOG_EVERY_N_SEC(INFO, 40);
LOG_EVERY_N_SEC(INFO, 50);
LOG_EVERY_N_SEC(INFO, 60);
LOG_EVERY_N_SEC(INFO, 70);
LOG_EVERY_N_SEC(INFO, 80);
LOG_EVERY_N_SEC(INFO, 90);
LOG_EVERY_N_SEC(INFO, 100);
}
}
BENCHMARK(BM_LogEveryNOverhead)->ThreadRange(1, 64);
} // namespace
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