mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-26 16:30:56 +00:00
1bd3431f7c
Summary: So that we can avoid calling NowSecs() in MakeRoomForWrite twice Test Plan: make all check Reviewers: yhchiang, igor, sdong Reviewed By: sdong Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D20529
76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
//
|
|
#pragma once
|
|
#include "rocksdb/env.h"
|
|
#include "util/statistics.h"
|
|
|
|
namespace rocksdb {
|
|
// Auto-scoped.
|
|
// Records the measure time into the corresponding histogram if statistics
|
|
// is not nullptr. It is also saved into *elapsed if the pointer is not nullptr.
|
|
class StopWatch {
|
|
public:
|
|
StopWatch(Env * const env, Statistics* statistics,
|
|
const uint32_t hist_type,
|
|
uint64_t* elapsed = nullptr)
|
|
: env_(env),
|
|
statistics_(statistics),
|
|
hist_type_(hist_type),
|
|
elapsed_(elapsed),
|
|
stats_enabled_(statistics && statistics->HistEnabledForType(hist_type)),
|
|
start_time_((stats_enabled_ || elapsed != nullptr) ?
|
|
env->NowMicros() : 0) {
|
|
}
|
|
|
|
|
|
~StopWatch() {
|
|
if (elapsed_) {
|
|
*elapsed_ = env_->NowMicros() - start_time_;
|
|
}
|
|
if (stats_enabled_) {
|
|
statistics_->measureTime(hist_type_,
|
|
(elapsed_ != nullptr) ? *elapsed_ :
|
|
(env_->NowMicros() - start_time_));
|
|
}
|
|
}
|
|
|
|
private:
|
|
Env* const env_;
|
|
Statistics* statistics_;
|
|
const uint32_t hist_type_;
|
|
uint64_t* elapsed_;
|
|
bool stats_enabled_;
|
|
const uint64_t start_time_;
|
|
};
|
|
|
|
// a nano second precision stopwatch
|
|
class StopWatchNano {
|
|
public:
|
|
explicit StopWatchNano(Env* const env, bool auto_start = false)
|
|
: env_(env), start_(0) {
|
|
if (auto_start) {
|
|
Start();
|
|
}
|
|
}
|
|
|
|
void Start() { start_ = env_->NowNanos(); }
|
|
|
|
uint64_t ElapsedNanos(bool reset = false) {
|
|
auto now = env_->NowNanos();
|
|
auto elapsed = now - start_;
|
|
if (reset) {
|
|
start_ = now;
|
|
}
|
|
return elapsed;
|
|
}
|
|
|
|
private:
|
|
Env* const env_;
|
|
uint64_t start_;
|
|
};
|
|
|
|
} // namespace rocksdb
|