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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
61 lines
2.1 KiB
C++
61 lines
2.1 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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//
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#pragma once
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#include "monitoring/perf_step_timer.h"
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#include "rocksdb/iostats_context.h"
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#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL
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namespace ROCKSDB_NAMESPACE {
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extern __thread IOStatsContext iostats_context;
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} // namespace ROCKSDB_NAMESPACE
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// increment a specific counter by the specified value
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#define IOSTATS_ADD(metric, value) (iostats_context.metric += value)
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// Increase metric value only when it is positive
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#define IOSTATS_ADD_IF_POSITIVE(metric, value) \
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if (value > 0) { IOSTATS_ADD(metric, value); }
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// reset a specific counter to zero
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#define IOSTATS_RESET(metric) (iostats_context.metric = 0)
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// reset all counters to zero
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#define IOSTATS_RESET_ALL() (iostats_context.Reset())
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#define IOSTATS_SET_THREAD_POOL_ID(value) \
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(iostats_context.thread_pool_id = value)
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#define IOSTATS_THREAD_POOL_ID() (iostats_context.thread_pool_id)
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#define IOSTATS(metric) (iostats_context.metric)
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// Declare and set start time of the timer
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#define IOSTATS_TIMER_GUARD(metric) \
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PerfStepTimer iostats_step_timer_##metric(&(iostats_context.metric)); \
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iostats_step_timer_##metric.Start();
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// Declare and set start time of the timer
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#define IOSTATS_CPU_TIMER_GUARD(metric, clock) \
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PerfStepTimer iostats_step_timer_##metric( \
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&(iostats_context.metric), clock, true, \
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PerfLevel::kEnableTimeAndCPUTimeExceptForMutex); \
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iostats_step_timer_##metric.Start();
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#else // ROCKSDB_SUPPORT_THREAD_LOCAL
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#define IOSTATS_ADD(metric, value)
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#define IOSTATS_ADD_IF_POSITIVE(metric, value)
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#define IOSTATS_RESET(metric)
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#define IOSTATS_RESET_ALL()
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#define IOSTATS_SET_THREAD_POOL_ID(value)
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#define IOSTATS_THREAD_POOL_ID()
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#define IOSTATS(metric) 0
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#define IOSTATS_TIMER_GUARD(metric)
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#define IOSTATS_CPU_TIMER_GUARD(metric, clock) static_cast<void>(clock)
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#endif // ROCKSDB_SUPPORT_THREAD_LOCAL
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