83681bf9ef
Summary: I'm separating code-cleanup part of https://reviews.facebook.net/D14517. This will make D14517 easier to understand and this diff easier to review. Test Plan: make check Reviewers: haobo, kailiu, sdong, dhruba, tnovak Reviewed By: tnovak CC: leveldb Differential Revision: https://reviews.facebook.net/D15099
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
// 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.
|
|
//
|
|
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#pragma once
|
|
#include "rocksdb/statistics.h"
|
|
|
|
#include <cassert>
|
|
#include <string>
|
|
#include <vector>
|
|
#include <map>
|
|
|
|
namespace rocksdb {
|
|
|
|
class HistogramBucketMapper {
|
|
public:
|
|
|
|
HistogramBucketMapper();
|
|
|
|
// converts a value to the bucket index.
|
|
const size_t IndexForValue(const uint64_t value) const;
|
|
// number of buckets required.
|
|
|
|
const size_t BucketCount() const {
|
|
return bucketValues_.size();
|
|
}
|
|
|
|
uint64_t LastValue() const {
|
|
return maxBucketValue_;
|
|
}
|
|
|
|
uint64_t FirstValue() const {
|
|
return minBucketValue_;
|
|
}
|
|
|
|
uint64_t BucketLimit(const uint64_t bucketNumber) const {
|
|
assert(bucketNumber < BucketCount());
|
|
return bucketValues_[bucketNumber];
|
|
}
|
|
|
|
private:
|
|
const std::vector<uint64_t> bucketValues_;
|
|
const uint64_t maxBucketValue_;
|
|
const uint64_t minBucketValue_;
|
|
std::map<uint64_t, uint64_t> valueIndexMap_;
|
|
};
|
|
|
|
class HistogramImpl {
|
|
public:
|
|
virtual void Clear();
|
|
virtual bool Empty();
|
|
virtual void Add(uint64_t value);
|
|
void Merge(const HistogramImpl& other);
|
|
|
|
virtual std::string ToString() const;
|
|
|
|
virtual double Median() const;
|
|
virtual double Percentile(double p) const;
|
|
virtual double Average() const;
|
|
virtual double StandardDeviation() const;
|
|
virtual void Data(HistogramData * const data) const;
|
|
|
|
private:
|
|
// To be able to use HistogramImpl as thread local variable, its constructor
|
|
// has to be static. That's why we're using manually values from BucketMapper
|
|
double min_ = 1000000000; // this is BucketMapper:LastValue()
|
|
double max_ = 0;
|
|
double num_ = 0;
|
|
double sum_ = 0;
|
|
double sum_squares_ = 0;
|
|
uint64_t buckets_[138] = {0}; // this is BucketMapper::BucketCount()
|
|
};
|
|
|
|
} // namespace rocksdb
|