d52f334cbd
Summary: Current stall will keep sleeping even if there is no Flush/Compactions to wait for, I changed the logic to break the stall if we are not flushing or compacting db_bench command used ``` # fillrandom # memtable size = 10MB # value size = 1 MB # num = 1000 # use /dev/shm ./db_bench --benchmarks="fillrandom,stats" --value_size=1048576 --write_buffer_size=10485760 --num=1000 --delayed_write_rate=XXXXX --db="/dev/shm/new_stall" | grep "Cumulative stall" ``` ``` Current results # delayed_write_rate = 1000 Kb/sec Cumulative stall: 00:00:9.031 H:M:S # delayed_write_rate = 200 Kb/sec Cumulative stall: 00:00:22.314 H:M:S # delayed_write_rate = 100 Kb/sec Cumulative stall: 00:00:42.784 H:M:S # delayed_write_rate = 50 Kb/sec Cumulative stall: 00:01:23.785 H:M:S # delayed_write_rate = 25 Kb/sec Cumulative stall: 00:02:45.702 H:M:S ``` ``` New results # delayed_write_rate = 1000 Kb/sec Cumulative stall: 00:00:9.017 H:M:S # delayed_write_rate = 200 Kb/sec Cumulative stall: 00 Closes https://github.com/facebook/rocksdb/pull/1884 Differential Revision: D4585439 Pulled By: IslamAbdelRahman fbshipit-source-id: aed2198
86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// Copyright (c) 2011-present, 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
|
|
// and overwrite is true, it will be added to *elapsed if overwrite is false.
|
|
class StopWatch {
|
|
public:
|
|
StopWatch(Env* const env, Statistics* statistics, const uint32_t hist_type,
|
|
uint64_t* elapsed = nullptr, bool overwrite = true)
|
|
: env_(env),
|
|
statistics_(statistics),
|
|
hist_type_(hist_type),
|
|
elapsed_(elapsed),
|
|
overwrite_(overwrite),
|
|
stats_enabled_(statistics && statistics->HistEnabledForType(hist_type)),
|
|
start_time_((stats_enabled_ || elapsed != nullptr) ? env->NowMicros()
|
|
: 0) {}
|
|
|
|
~StopWatch() {
|
|
if (elapsed_) {
|
|
if (overwrite_) {
|
|
*elapsed_ = env_->NowMicros() - start_time_;
|
|
} else {
|
|
*elapsed_ += env_->NowMicros() - start_time_;
|
|
}
|
|
}
|
|
if (stats_enabled_) {
|
|
statistics_->measureTime(hist_type_,
|
|
(elapsed_ != nullptr) ? *elapsed_ :
|
|
(env_->NowMicros() - start_time_));
|
|
}
|
|
}
|
|
|
|
uint64_t start_time() const { return start_time_; }
|
|
|
|
private:
|
|
Env* const env_;
|
|
Statistics* statistics_;
|
|
const uint32_t hist_type_;
|
|
uint64_t* elapsed_;
|
|
bool overwrite_;
|
|
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;
|
|
}
|
|
|
|
uint64_t ElapsedNanosSafe(bool reset = false) {
|
|
return (env_ != nullptr) ? ElapsedNanos(reset) : 0U;
|
|
}
|
|
|
|
private:
|
|
Env* const env_;
|
|
uint64_t start_;
|
|
};
|
|
|
|
} // namespace rocksdb
|