181191a1e4
Summary:
Add a counter for collecting the wait time on db mutex.
Also add MutexWrapper and CondVarWrapper for measuring wait time.
Test Plan:
./db_test
export ROCKSDB_TESTS=MutexWaitStats
./db_test
verify stats output using db_bench
make clean
make release
./db_bench --statistics=1 --benchmarks=fillseq,readwhilewriting --num=10000 --threads=10
Sample output:
rocksdb.db.mutex.wait.micros COUNT : 7546866
Reviewers: MarkCallaghan, rven, sdong, igor
Reviewed By: igor
Subscribers: dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D32787
99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
// Copyright (c) 2015, 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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#pragma once
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#include "port/port.h"
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#include "rocksdb/env.h"
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#include "rocksdb/statistics.h"
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#include "rocksdb/thread_status.h"
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#include "util/statistics.h"
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#include "util/stop_watch.h"
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namespace rocksdb {
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class InstrumentedCondVar;
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// A wrapper class for port::Mutex that provides additional layer
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// for collecting stats and instrumentation.
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class InstrumentedMutex {
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public:
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explicit InstrumentedMutex(bool adaptive = false)
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: mutex_(adaptive), stats_(nullptr), env_(nullptr),
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stats_code_(0) {}
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InstrumentedMutex(
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Statistics* stats, Env* env,
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int stats_code, bool adaptive = false)
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: mutex_(adaptive), stats_(stats), env_(env),
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stats_code_(stats_code) {}
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void Lock();
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void Unlock() {
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mutex_.Unlock();
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}
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void AssertHeld() {
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mutex_.AssertHeld();
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}
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private:
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void LockInternal();
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friend class InstrumentedCondVar;
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port::Mutex mutex_;
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Statistics* stats_;
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Env* env_;
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int stats_code_;
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};
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// A wrapper class for port::Mutex that provides additional layer
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// for collecting stats and instrumentation.
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class InstrumentedMutexLock {
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public:
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explicit InstrumentedMutexLock(InstrumentedMutex* mutex) : mutex_(mutex) {
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mutex_->Lock();
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}
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~InstrumentedMutexLock() {
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mutex_->Unlock();
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}
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private:
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InstrumentedMutex* const mutex_;
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InstrumentedMutexLock(const InstrumentedMutexLock&) = delete;
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void operator=(const InstrumentedMutexLock&) = delete;
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};
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class InstrumentedCondVar {
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public:
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explicit InstrumentedCondVar(InstrumentedMutex* instrumented_mutex)
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: cond_(&(instrumented_mutex->mutex_)),
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stats_(instrumented_mutex->stats_),
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env_(instrumented_mutex->env_),
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stats_code_(instrumented_mutex->stats_code_) {}
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void Wait();
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bool TimedWait(uint64_t abs_time_us);
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void Signal() {
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cond_.Signal();
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}
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void SignalAll() {
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cond_.SignalAll();
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}
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private:
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void WaitInternal();
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bool TimedWaitInternal(uint64_t abs_time_us);
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port::CondVar cond_;
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Statistics* stats_;
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Env* env_;
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int stats_code_;
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};
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} // namespace rocksdb
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