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https://github.com/facebook/rocksdb.git
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237a3da677
Summary: Currently, even if statistics is not enabled, StopWatch only for the stats still gets the time of the day, which is wasteful. This patch adds a new option to StopWatch to disable this get in this case. Test Plan: make all check Reviewers: dhruba, haobo, igor CC: leveldb Differential Revision: https://reviews.facebook.net/D14703 Conflicts: db/db_impl.cc
72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#pragma once
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#include "rocksdb/env.h"
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#include "util/statistics_imp.h"
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namespace rocksdb {
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// Auto-scoped.
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// Records the statistic into the corresponding histogram.
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class StopWatch {
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public:
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explicit StopWatch(
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Env * const env,
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Statistics* statistics = nullptr,
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const Histograms histogram_name = DB_GET,
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bool auto_start = true) :
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env_(env),
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start_time_((!auto_start && !statistics) ? 0 : env->NowMicros()),
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statistics_(statistics),
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histogram_name_(histogram_name) {}
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uint64_t ElapsedMicros() {
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return env_->NowMicros() - start_time_;
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}
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~StopWatch() {
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if (statistics_) {
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statistics_->measureTime(histogram_name_, ElapsedMicros());
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}
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}
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private:
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Env* const env_;
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const uint64_t start_time_;
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Statistics* statistics_;
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const Histograms histogram_name_;
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};
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// a nano second precision stopwatch
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class StopWatchNano {
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public:
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explicit StopWatchNano(Env* const env, bool auto_start = false)
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: env_(env), start_(0) {
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if (auto_start) {
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Start();
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}
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}
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void Start() { start_ = env_->NowNanos(); }
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uint64_t ElapsedNanos(bool reset = false) {
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auto now = env_->NowNanos();
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auto elapsed = now - start_;
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if (reset) {
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start_ = now;
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}
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return elapsed;
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}
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private:
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Env* const env_;
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uint64_t start_;
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};
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} // namespace rocksdb
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