fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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210 lines
6.8 KiB
210 lines
6.8 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef STORAGE_LEVELDB_INCLUDE_STATISTICS_H_
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#define STORAGE_LEVELDB_INCLUDE_STATISTICS_H_
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#include <atomic>
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <string>
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#include <memory>
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#include <vector>
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namespace leveldb {
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/**
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* Keep adding ticker's here.
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* Any ticker should have a value less than TICKER_ENUM_MAX.
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* Add a new ticker by assigning it the current value of TICKER_ENUM_MAX
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* Add a string representation in TickersNameMap below.
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* And incrementing TICKER_ENUM_MAX.
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*/
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enum Tickers {
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BLOCK_CACHE_MISS = 0,
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BLOCK_CACHE_HIT = 1,
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BLOOM_FILTER_USEFUL = 2, // no. of times bloom filter has avoided file reads.
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/**
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* COMPACTION_KEY_DROP_* count the reasons for key drop during compaction
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* There are 3 reasons currently.
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*/
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COMPACTION_KEY_DROP_NEWER_ENTRY = 3, // key was written with a newer value.
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COMPACTION_KEY_DROP_OBSOLETE = 4, // The key is obsolete.
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COMPACTION_KEY_DROP_USER = 5, // user compaction function has dropped the key.
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// Number of keys written to the database via the Put and Write call's
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NUMBER_KEYS_WRITTEN = 6,
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// Number of Keys read,
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NUMBER_KEYS_READ = 7,
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// Bytes written / read
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BYTES_WRITTEN = 8,
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BYTES_READ = 9,
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NO_FILE_CLOSES = 10,
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NO_FILE_OPENS = 11,
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NO_FILE_ERRORS = 12,
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// Time system had to wait to do LO-L1 compactions
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STALL_L0_SLOWDOWN_MICROS = 13,
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// Time system had to wait to move memtable to L1.
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STALL_MEMTABLE_COMPACTION_MICROS = 14,
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// write throttle because of too many files in L0
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STALL_L0_NUM_FILES_MICROS = 15,
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RATE_LIMIT_DELAY_MILLIS = 16,
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NO_ITERATORS = 17, // number of iterators currently open
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// Number of MultiGet calls, keys read, and bytes read
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NUMBER_MULTIGET_CALLS = 18,
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NUMBER_MULTIGET_KEYS_READ = 19,
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NUMBER_MULTIGET_BYTES_READ = 20,
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NUMBER_FILTERED_DELETES = 21,
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TICKER_ENUM_MAX = 22
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};
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const std::vector<std::pair<Tickers, std::string>> TickersNameMap = {
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{ BLOCK_CACHE_MISS, "rocksdb.block.cache.miss" },
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{ BLOCK_CACHE_HIT, "rocksdb.block.cache.hit" },
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{ BLOOM_FILTER_USEFUL, "rocksdb.bloom.filter.useful" },
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{ COMPACTION_KEY_DROP_NEWER_ENTRY, "rocksdb.compaction.key.drop.new" },
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{ COMPACTION_KEY_DROP_OBSOLETE, "rocksdb.compaction.key.drop.obsolete" },
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{ COMPACTION_KEY_DROP_USER, "rocksdb.compaction.key.drop.user" },
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{ NUMBER_KEYS_WRITTEN, "rocksdb.number.keys.written" },
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{ NUMBER_KEYS_READ, "rocksdb.number.keys.read" },
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{ BYTES_WRITTEN, "rocksdb.bytes.written" },
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{ BYTES_READ, "rocksdb.bytes.read" },
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{ NO_FILE_CLOSES, "rocksdb.no.file.closes" },
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{ NO_FILE_OPENS, "rocksdb.no.file.opens" },
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{ NO_FILE_ERRORS, "rocksdb.no.file.errors" },
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{ STALL_L0_SLOWDOWN_MICROS, "rocksdb.l0.slowdown.micros" },
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{ STALL_MEMTABLE_COMPACTION_MICROS, "rocksdb.memtable.compaction.micros" },
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{ STALL_L0_NUM_FILES_MICROS, "rocksdb.l0.num.files.stall.micros" },
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{ RATE_LIMIT_DELAY_MILLIS, "rocksdb.rate.limit.dleay.millis" },
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{ NO_ITERATORS, "rocksdb.num.iterators" },
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{ NUMBER_MULTIGET_CALLS, "rocksdb.number.multiget.get" },
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{ NUMBER_MULTIGET_KEYS_READ, "rocksdb.number.multiget.keys.read" },
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{ NUMBER_MULTIGET_BYTES_READ, "rocksdb.number.multiget.bytes.read" },
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{ NUMBER_FILTERED_DELETES, "rocksdb.number.deletes.filtered" }
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};
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/**
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* Keep adding histogram's here.
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* Any histogram whould have value less than HISTOGRAM_ENUM_MAX
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* Add a new Histogram by assigning it the current value of HISTOGRAM_ENUM_MAX
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* Add a string representation in HistogramsNameMap below
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* And increment HISTOGRAM_ENUM_MAX
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*/
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enum Histograms {
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DB_GET = 0,
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DB_WRITE = 1,
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COMPACTION_TIME = 2,
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TABLE_SYNC_MICROS = 3,
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COMPACTION_OUTFILE_SYNC_MICROS = 4,
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WAL_FILE_SYNC_MICROS = 5,
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MANIFEST_FILE_SYNC_MICROS = 6,
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// TIME SPENT IN IO DURING TABLE OPEN
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TABLE_OPEN_IO_MICROS = 7,
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DB_MULTIGET = 8,
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READ_BLOCK_COMPACTION_MICROS = 9,
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READ_BLOCK_GET_MICROS = 10,
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WRITE_RAW_BLOCK_MICROS = 11,
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HISTOGRAM_ENUM_MAX = 12
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};
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const std::vector<std::pair<Histograms, std::string>> HistogramsNameMap = {
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{ DB_GET, "rocksdb.db.get.micros" },
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{ DB_WRITE, "rocksdb.db.write.micros" },
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{ COMPACTION_TIME, "rocksdb.compaction.times.micros" },
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{ TABLE_SYNC_MICROS, "rocksdb.table.sync.micros" },
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{ COMPACTION_OUTFILE_SYNC_MICROS, "rocksdb.compaction.outfile.sync.micros" },
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{ WAL_FILE_SYNC_MICROS, "rocksdb.wal.file.sync.micros" },
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{ MANIFEST_FILE_SYNC_MICROS, "rocksdb.manifest.file.sync.micros" },
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{ TABLE_OPEN_IO_MICROS, "rocksdb.table.open.io.micros" },
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{ DB_MULTIGET, "rocksdb.db.multiget.micros" },
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{ READ_BLOCK_COMPACTION_MICROS, "rocksdb.read.block.compaction.micros" },
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{ READ_BLOCK_GET_MICROS, "rocksdb.read.block.get.micros" },
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{ WRITE_RAW_BLOCK_MICROS, "rocksdb.write.raw.block.micros" }
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};
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struct HistogramData {
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double median;
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double percentile95;
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double percentile99;
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double average;
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double standard_deviation;
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};
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class Histogram {
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public:
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// clear's the histogram
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virtual void Clear() = 0;
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virtual ~Histogram();
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// Add a value to be recorded in the histogram.
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virtual void Add(uint64_t value) = 0;
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virtual std::string ToString() const = 0;
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// Get statistics
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virtual double Median() const = 0;
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virtual double Percentile(double p) const = 0;
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virtual double Average() const = 0;
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virtual double StandardDeviation() const = 0;
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virtual void Data(HistogramData * const data) const = 0;
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};
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/**
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* A dumb ticker which keeps incrementing through its life time.
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* Not thread safe. Locking is currently managed by external leveldb lock
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*/
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class Ticker {
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public:
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Ticker() : count_(0) { }
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inline void recordTick() {
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count_++;
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}
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inline void recordTick(int count) {
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count_ += count;
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}
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inline uint64_t getCount() {
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return count_;
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}
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private:
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std::atomic_uint_fast64_t count_;
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};
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// Analyze the performance of a db
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class Statistics {
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public:
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virtual long getTickerCount(Tickers tickerType) = 0;
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virtual void recordTick(Tickers tickerType, uint64_t count = 0) = 0;
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virtual void measureTime(Histograms histogramType, uint64_t time) = 0;
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virtual void histogramData(Histograms type, HistogramData * const data) = 0;
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// String representation of the statistic object.
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std::string ToString();
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};
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// Create a concrete DBStatistics object
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std::shared_ptr<Statistics> CreateDBStatistics();
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// Ease of Use functions
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inline void RecordTick(std::shared_ptr<Statistics> statistics,
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Tickers ticker,
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uint64_t count = 1) {
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assert(HistogramsNameMap.size() == HISTOGRAM_ENUM_MAX);
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assert(TickersNameMap.size() == TICKER_ENUM_MAX);
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if (statistics) {
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statistics->recordTick(ticker, count);
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}
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}
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_INCLUDE_STATISTICS_H_
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