43 lines
925 B
C
43 lines
925 B
C
|
// 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.
|
||
|
|
|
||
|
|
#ifndef STORAGE_LEVELDB_UTIL_HISTOGRAM_H_
|
||
|
|
#define STORAGE_LEVELDB_UTIL_HISTOGRAM_H_
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
namespace leveldb {
|
||
|
|
|
||
|
|
class Histogram {
|
||
|
|
public:
|
||
|
|
Histogram() { }
|
||
|
|
~Histogram() { }
|
||
|
|
|
||
|
|
void Clear();
|
||
|
|
void Add(double value);
|
||
|
|
void Merge(const Histogram& other);
|
||
|
|
|
||
|
|
std::string ToString() const;
|
||
|
|
|
||
|
|
private:
|
||
|
|
double min_;
|
||
|
|
double max_;
|
||
|
|
double num_;
|
||
|
|
double sum_;
|
||
|
|
double sum_squares_;
|
||
|
|
|
||
|
|
enum { kNumBuckets = 154 };
|
||
|
|
static const double kBucketLimit[kNumBuckets];
|
||
|
|
double buckets_[kNumBuckets];
|
||
|
|
|
||
|
|
double Median() const;
|
||
|
|
double Percentile(double p) const;
|
||
|
|
double Average() const;
|
||
|
|
double StandardDeviation() const;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace leveldb
|
||
|
|
|
||
|
|
#endif // STORAGE_LEVELDB_UTIL_HISTOGRAM_H_
|