rocksdb/util/statistics.h

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#pragma once
#include "rocksdb/statistics.h"
#include <vector>
#include <atomic>
#include <string>
#include "util/histogram.h"
#include "util/mutexlock.h"
#include "port/likely.h"
namespace rocksdb {
enum TickersInternal : uint32_t {
INTERNAL_TICKER_ENUM_START = TICKER_ENUM_MAX,
INTERNAL_TICKER_ENUM_MAX
};
enum HistogramsInternal : uint32_t {
INTERNAL_HISTOGRAM_START = HISTOGRAM_ENUM_MAX,
INTERNAL_HISTOGRAM_ENUM_MAX
};
class StatisticsImpl : public Statistics {
public:
StatisticsImpl(std::shared_ptr<Statistics> stats,
bool enable_internal_stats);
virtual ~StatisticsImpl();
virtual uint64_t getTickerCount(uint32_t ticker_type) const override;
virtual void histogramData(uint32_t histogram_type,
HistogramData* const data) const override;
std::string getHistogramString(uint32_t histogram_type) const override;
virtual void setTickerCount(uint32_t ticker_type, uint64_t count) override;
virtual void recordTick(uint32_t ticker_type, uint64_t count) override;
virtual void measureTime(uint32_t histogram_type, uint64_t value) override;
virtual std::string ToString() const override;
virtual bool HistEnabledForType(uint32_t type) const override;
private:
std::shared_ptr<Statistics> stats_shared_;
Statistics* stats_;
bool enable_internal_stats_;
convert Tickers back to array with padding and alignment Summary: Pad each Ticker structure to be 64 bytes and make them align on 64 bytes boundary to avoid cache line false sharing issue. Please refer to task 3615553 for more details Test Plan: db_bench LevelDB: version 2.0s Date: Wed Jan 29 12:23:17 2014 CPU: 32 * Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz CPUCache: 20480 KB rocksdb.build.overwrite.qps 49638 rocksdb.build.overwrite.p50_micros 58.73 rocksdb.build.overwrite.p75_micros 210.56 rocksdb.build.overwrite.p99_micros 733.28 rocksdb.build.fillseq.qps 366729 rocksdb.build.fillseq.p50_micros 1.00 rocksdb.build.fillseq.p75_micros 1.00 rocksdb.build.fillseq.p99_micros 2.65 rocksdb.build.readrandom.qps 1152995 rocksdb.build.readrandom.p50_micros 11.27 rocksdb.build.readrandom.p75_micros 15.69 rocksdb.build.readrandom.p99_micros 33.59 rocksdb.build.readrandom_smallblockcache.qps 956047 rocksdb.build.readrandom_smallblockcache.p50_micros 15.23 rocksdb.build.readrandom_smallblockcache.p75_micros 17.31 rocksdb.build.readrandom_smallblockcache.p99_micros 31.49 rocksdb.build.readrandom_memtable_sst.qps 1105183 rocksdb.build.readrandom_memtable_sst.p50_micros 12.04 rocksdb.build.readrandom_memtable_sst.p75_micros 15.78 rocksdb.build.readrandom_memtable_sst.p99_micros 32.49 rocksdb.build.readrandom_fillunique_random.qps 487856 rocksdb.build.readrandom_fillunique_random.p50_micros 29.65 rocksdb.build.readrandom_fillunique_random.p75_micros 40.93 rocksdb.build.readrandom_fillunique_random.p99_micros 78.68 rocksdb.build.memtablefillrandom.qps 91304 rocksdb.build.memtablefillrandom.p50_micros 171.05 rocksdb.build.memtablefillrandom.p75_micros 196.12 rocksdb.build.memtablefillrandom.p99_micros 291.73 rocksdb.build.memtablereadrandom.qps 1340411 rocksdb.build.memtablereadrandom.p50_micros 9.48 rocksdb.build.memtablereadrandom.p75_micros 13.95 rocksdb.build.memtablereadrandom.p99_micros 30.36 rocksdb.build.readwhilewriting.qps 491004 rocksdb.build.readwhilewriting.p50_micros 29.58 rocksdb.build.readwhilewriting.p75_micros 40.34 rocksdb.build.readwhilewriting.p99_micros 76.78 Reviewers: igor, haobo Reviewed By: igor CC: leveldb Differential Revision: https://reviews.facebook.net/D15573
2014-01-30 00:08:41 +01:00
struct Ticker {
Ticker() : value(uint_fast64_t()) {}
std::atomic_uint_fast64_t value;
// Pad the structure to make it size of 64 bytes. A plain array of
// std::atomic_uint_fast64_t results in huge performance degradataion
// due to false sharing.
char padding[64 - sizeof(std::atomic_uint_fast64_t)];
};
Ticker tickers_[INTERNAL_TICKER_ENUM_MAX] __attribute__((aligned(64)));
HistogramImpl histograms_[INTERNAL_HISTOGRAM_ENUM_MAX]
__attribute__((aligned(64)));
};
// Utility functions
inline void MeasureTime(Statistics* statistics, uint32_t histogram_type,
uint64_t value) {
if (statistics) {
statistics->measureTime(histogram_type, value);
}
}
inline void RecordTick(Statistics* statistics, uint32_t ticker_type,
uint64_t count = 1) {
if (statistics) {
statistics->recordTick(ticker_type, count);
}
}
inline void SetTickerCount(Statistics* statistics, uint32_t ticker_type,
uint64_t count) {
if (statistics) {
statistics->setTickerCount(ticker_type, count);
}
}
}