mirror of https://github.com/facebook/rocksdb.git
80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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#pragma once
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#include "monitoring/perf_level_imp.h"
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#include "monitoring/statistics.h"
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#include "rocksdb/system_clock.h"
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namespace ROCKSDB_NAMESPACE {
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class PerfStepTimer {
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public:
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explicit PerfStepTimer(
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uint64_t* metric, SystemClock* clock = nullptr, bool use_cpu_time = false,
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PerfLevel enable_level = PerfLevel::kEnableTimeExceptForMutex,
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Statistics* statistics = nullptr, uint32_t ticker_type = 0)
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: perf_counter_enabled_(perf_level >= enable_level),
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use_cpu_time_(use_cpu_time),
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ticker_type_(ticker_type),
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clock_((perf_counter_enabled_ || statistics != nullptr)
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? (clock ? clock : SystemClock::Default().get())
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: nullptr),
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start_(0),
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metric_(metric),
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statistics_(statistics) {}
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~PerfStepTimer() {
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Stop();
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}
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void Start() {
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if (perf_counter_enabled_ || statistics_ != nullptr) {
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start_ = time_now();
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}
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}
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void Measure() {
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if (start_) {
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uint64_t now = time_now();
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*metric_ += now - start_;
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start_ = now;
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}
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}
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void Stop() {
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if (start_) {
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uint64_t duration = time_now() - start_;
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if (perf_counter_enabled_) {
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*metric_ += duration;
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}
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if (statistics_ != nullptr) {
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RecordTick(statistics_, ticker_type_, duration);
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}
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start_ = 0;
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}
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}
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private:
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uint64_t time_now() {
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if (!use_cpu_time_) {
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return clock_->NowNanos();
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} else {
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return clock_->CPUNanos();
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}
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}
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const bool perf_counter_enabled_;
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const bool use_cpu_time_;
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uint32_t ticker_type_;
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SystemClock* const clock_;
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uint64_t start_;
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uint64_t* metric_;
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Statistics* statistics_;
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};
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} // namespace ROCKSDB_NAMESPACE
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