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https://github.com/facebook/rocksdb.git
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3dff28cf9b
Summary: For performance purposes, the lower level routines were changed to use a SystemClock* instead of a std::shared_ptr<SystemClock>. The shared ptr has some performance degradation on certain hardware classes. For most of the system, there is no risk of the pointer being deleted/invalid because the shared_ptr will be stored elsewhere. For example, the ImmutableDBOptions stores the Env which has a std::shared_ptr<SystemClock> in it. The SystemClock* within the ImmutableDBOptions is essentially a "short cut" to gain access to this constant resource. There were a few classes (PeriodicWorkScheduler?) where the "short cut" property did not hold. In those cases, the shared pointer was preserved. Using db_bench readrandom perf_level=3 on my EC2 box, this change performed as well or better than 6.17: 6.17: readrandom : 28.046 micros/op 854902 ops/sec; 61.3 MB/s (355999 of 355999 found) 6.18: readrandom : 32.615 micros/op 735306 ops/sec; 52.7 MB/s (290999 of 290999 found) PR: readrandom : 27.500 micros/op 871909 ops/sec; 62.5 MB/s (367999 of 367999 found) (Note that the times for 6.18 are prior to revert of the SystemClock). Pull Request resolved: https://github.com/facebook/rocksdb/pull/8033 Reviewed By: pdillinger Differential Revision: D27014563 Pulled By: mrambacher fbshipit-source-id: ad0459eba03182e454391b5926bf5cdd45657b67
102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include "monitoring/statistics.h"
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#include "port/port.h"
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#include "rocksdb/statistics.h"
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#include "rocksdb/system_clock.h"
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#include "rocksdb/thread_status.h"
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#include "util/stop_watch.h"
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namespace ROCKSDB_NAMESPACE {
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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), clock_(nullptr), stats_code_(0) {}
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explicit InstrumentedMutex(SystemClock* clock, bool adaptive = false)
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: mutex_(adaptive), stats_(nullptr), clock_(clock), stats_code_(0) {}
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InstrumentedMutex(Statistics* stats, SystemClock* clock, int stats_code,
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bool adaptive = false)
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: mutex_(adaptive),
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stats_(stats),
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clock_(clock),
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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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SystemClock* clock_;
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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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clock_(instrumented_mutex->clock_),
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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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SystemClock* clock_;
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int stats_code_;
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};
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} // namespace ROCKSDB_NAMESPACE
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