mirror of https://github.com/facebook/rocksdb.git
55 lines
1.2 KiB
C++
55 lines
1.2 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 "rocksdb/env.h"
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#include "util/stop_watch.h"
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namespace rocksdb {
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class PerfStepTimer {
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public:
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explicit PerfStepTimer(uint64_t* metric, bool for_mutex = false)
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: enabled_(perf_level >= PerfLevel::kEnableTime ||
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(!for_mutex && perf_level >= kEnableTimeExceptForMutex)),
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env_(enabled_ ? Env::Default() : nullptr),
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start_(0),
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metric_(metric) {}
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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 (enabled_) {
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start_ = env_->NowNanos();
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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 = env_->NowNanos();
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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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*metric_ += env_->NowNanos() - start_;
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start_ = 0;
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}
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}
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private:
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const bool enabled_;
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Env* const env_;
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uint64_t start_;
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uint64_t* metric_;
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};
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} // namespace rocksdb
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