mirror of https://github.com/facebook/rocksdb.git
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
// Copyright (c) 2011-present, 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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//
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#pragma once
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#include "rocksdb/statistics.h"
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#include <vector>
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#include <atomic>
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#include <string>
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#include "util/histogram.h"
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#include "util/mutexlock.h"
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#include "port/likely.h"
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namespace rocksdb {
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enum TickersInternal : uint32_t {
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INTERNAL_TICKER_ENUM_START = TICKER_ENUM_MAX,
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INTERNAL_TICKER_ENUM_MAX
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};
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enum HistogramsInternal : uint32_t {
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INTERNAL_HISTOGRAM_START = HISTOGRAM_ENUM_MAX,
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INTERNAL_HISTOGRAM_ENUM_MAX
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};
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class StatisticsImpl : public Statistics {
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public:
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StatisticsImpl(std::shared_ptr<Statistics> stats,
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bool enable_internal_stats);
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virtual ~StatisticsImpl();
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virtual uint64_t getTickerCount(uint32_t ticker_type) const override;
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virtual void histogramData(uint32_t histogram_type,
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HistogramData* const data) const override;
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std::string getHistogramString(uint32_t histogram_type) const override;
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virtual void setTickerCount(uint32_t ticker_type, uint64_t count) override;
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virtual void recordTick(uint32_t ticker_type, uint64_t count) override;
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virtual void measureTime(uint32_t histogram_type, uint64_t value) override;
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virtual std::string ToString() const override;
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virtual bool HistEnabledForType(uint32_t type) const override;
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private:
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std::shared_ptr<Statistics> stats_shared_;
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Statistics* stats_;
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bool enable_internal_stats_;
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struct Ticker {
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Ticker() : value(uint_fast64_t()) {}
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std::atomic_uint_fast64_t value;
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// Pad the structure to make it size of 64 bytes. A plain array of
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// std::atomic_uint_fast64_t results in huge performance degradataion
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// due to false sharing.
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char padding[64 - sizeof(std::atomic_uint_fast64_t)];
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};
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static_assert(sizeof(Ticker) == 64, "Expecting to fit into 64 bytes");
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// Attributes expand to nothing depending on the platform
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__declspec(align(64))
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Ticker tickers_[INTERNAL_TICKER_ENUM_MAX]
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__attribute__((aligned(64)));
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__declspec(align(64))
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HistogramImpl histograms_[INTERNAL_HISTOGRAM_ENUM_MAX]
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__attribute__((aligned(64)));
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};
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// Utility functions
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inline void MeasureTime(Statistics* statistics, uint32_t histogram_type,
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uint64_t value) {
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if (statistics) {
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statistics->measureTime(histogram_type, value);
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}
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}
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inline void RecordTick(Statistics* statistics, uint32_t ticker_type,
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uint64_t count = 1) {
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if (statistics) {
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statistics->recordTick(ticker_type, count);
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}
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}
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inline void SetTickerCount(Statistics* statistics, uint32_t ticker_type,
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uint64_t count) {
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if (statistics) {
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statistics->setTickerCount(ticker_type, count);
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}
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}
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}
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