mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-26 16:30:56 +00:00
02974c9437
Summary: On x86_64, this makes the struct 8 bytes smaller, so creating a PerfStepTimer on the stack will use slightly less stack space. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7931 Reviewed By: jay-zhuang Differential Revision: D26529470 Pulled By: ajkr fbshipit-source-id: bbe2e843167152ffa05a5946f1add6621c9849f7
80 lines
2 KiB
C++
80 lines
2 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
//
|
|
#pragma once
|
|
#include "monitoring/perf_level_imp.h"
|
|
#include "monitoring/statistics.h"
|
|
#include "rocksdb/system_clock.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
class PerfStepTimer {
|
|
public:
|
|
explicit PerfStepTimer(
|
|
uint64_t* metric, SystemClock* clock = nullptr, bool use_cpu_time = false,
|
|
PerfLevel enable_level = PerfLevel::kEnableTimeExceptForMutex,
|
|
Statistics* statistics = nullptr, uint32_t ticker_type = 0)
|
|
: perf_counter_enabled_(perf_level >= enable_level),
|
|
use_cpu_time_(use_cpu_time),
|
|
ticker_type_(ticker_type),
|
|
clock_((perf_counter_enabled_ || statistics != nullptr)
|
|
? (clock ? clock : SystemClock::Default().get())
|
|
: nullptr),
|
|
start_(0),
|
|
metric_(metric),
|
|
statistics_(statistics) {}
|
|
|
|
~PerfStepTimer() {
|
|
Stop();
|
|
}
|
|
|
|
void Start() {
|
|
if (perf_counter_enabled_ || statistics_ != nullptr) {
|
|
start_ = time_now();
|
|
}
|
|
}
|
|
|
|
void Measure() {
|
|
if (start_) {
|
|
uint64_t now = time_now();
|
|
*metric_ += now - start_;
|
|
start_ = now;
|
|
}
|
|
}
|
|
|
|
void Stop() {
|
|
if (start_) {
|
|
uint64_t duration = time_now() - start_;
|
|
if (perf_counter_enabled_) {
|
|
*metric_ += duration;
|
|
}
|
|
|
|
if (statistics_ != nullptr) {
|
|
RecordTick(statistics_, ticker_type_, duration);
|
|
}
|
|
start_ = 0;
|
|
}
|
|
}
|
|
|
|
private:
|
|
uint64_t time_now() {
|
|
if (!use_cpu_time_) {
|
|
return clock_->NowNanos();
|
|
} else {
|
|
return clock_->CPUNanos();
|
|
}
|
|
}
|
|
|
|
const bool perf_counter_enabled_;
|
|
const bool use_cpu_time_;
|
|
uint32_t ticker_type_;
|
|
SystemClock* const clock_;
|
|
uint64_t start_;
|
|
uint64_t* metric_;
|
|
Statistics* statistics_;
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|