mirror of https://github.com/facebook/rocksdb.git
95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
// 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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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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* 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COMPACTION_KEY_DROP_OBSOLETE = 4, // The key is obsolete.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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TICKER_ENUM_MAX = 8,
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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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uint64_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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// Create an Statistics object with default values for all fields.
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Statistics() : numFileOpens_(0), numFileCloses_(0),
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numFileErrors_(0) {}
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virtual void incNumFileOpens() = 0;
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virtual void incNumFileCloses() = 0;
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virtual void incNumFileErrors() = 0;
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virtual long getNumFileOpens() { return numFileOpens_;}
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virtual long getNumFileCloses() { return numFileCloses_;}
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virtual long getNumFileErrors() { return numFileErrors_;}
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virtual ~Statistics() {}
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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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protected:
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long numFileOpens_;
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long numFileCloses_;
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long numFileErrors_;
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};
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// Ease of Use functions
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inline void RecordTick(Statistics* const statistics,
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Tickers ticker,
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uint64_t count = 1) {
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if (statistics != NULL) {
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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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