c7742452eb
Summary: Provide a way for users to know more detailed ditribution of a histogram metrics. Example outputs: Manually add statement fprintf(stdout, "%s\n", dbstats->getHistogramString(SST_READ_MICROS).c_str()); Will print out something like: Count: 989151 Average: 1.7659 StdDev: 1.52 Min: 0.0000 Median: 1.2071 Max: 860.0000 Percentiles: P50: 1.21 P75: 1.70 P99: 5.12 P99.9: 13.67 P99.99: 21.70 ------------------------------------------------------ [ 0, 1 ) 390839 39.513% 39.513% ######## [ 1, 2 ) 500918 50.641% 90.154% ########## [ 2, 3 ) 79358 8.023% 98.177% ## [ 3, 4 ) 6297 0.637% 98.813% [ 4, 5 ) 1712 0.173% 98.986% [ 5, 6 ) 1134 0.115% 99.101% [ 6, 7 ) 1222 0.124% 99.224% [ 7, 8 ) 1529 0.155% 99.379% [ 8, 9 ) 1264 0.128% 99.507% [ 9, 10 ) 988 0.100% 99.607% [ 10, 12 ) 1378 0.139% 99.746% [ 12, 14 ) 1828 0.185% 99.931% [ 14, 16 ) 410 0.041% 99.972% [ 16, 18 ) 72 0.007% 99.980% [ 18, 20 ) 67 0.007% 99.986% [ 20, 25 ) 106 0.011% 99.997% [ 25, 30 ) 24 0.002% 99.999% [ 30, 35 ) 1 0.000% 100.000% [ 250, 300 ) 2 0.000% 100.000% [ 300, 350 ) 1 0.000% 100.000% [ 800, 900 ) 1 0.000% 100.000% Test Plan: Manually add a print in db_bench and make sure it prints out as expected. Will add some codes to cover the function Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D43611
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
// Copyright (c) 2013, 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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Ticker tickers_[INTERNAL_TICKER_ENUM_MAX] __attribute__((aligned(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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