d616ebea23
Summary: Closes https://github.com/facebook/rocksdb/pull/2226 Differential Revision: D4967547 Pulled By: siying fbshipit-source-id: dd3b58ae1e7a106ab6bb6f37ab5c88575b125ab4
82 lines
2.9 KiB
C++
82 lines
2.9 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.
|
|
// This source code is also licensed under the GPLv2 license found in the
|
|
// COPYING file in the root directory of this source tree.
|
|
//
|
|
// 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 "monitoring/histogram.h"
|
|
#include "rocksdb/env.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
class HistogramWindowingImpl : public Histogram
|
|
{
|
|
public:
|
|
HistogramWindowingImpl();
|
|
HistogramWindowingImpl(uint64_t num_windows,
|
|
uint64_t micros_per_window,
|
|
uint64_t min_num_per_window);
|
|
|
|
HistogramWindowingImpl(const HistogramImpl&) = delete;
|
|
HistogramWindowingImpl& operator=(const HistogramImpl&) = delete;
|
|
|
|
~HistogramWindowingImpl();
|
|
|
|
virtual void Clear() override;
|
|
virtual bool Empty() const override;
|
|
virtual void Add(uint64_t value) override;
|
|
virtual void Merge(const Histogram& other) override;
|
|
void Merge(const HistogramWindowingImpl& other);
|
|
|
|
virtual std::string ToString() const override;
|
|
virtual const char* Name() const override { return "HistogramWindowingImpl"; }
|
|
virtual uint64_t min() const override { return stats_.min(); }
|
|
virtual uint64_t max() const override { return stats_.max(); }
|
|
virtual uint64_t num() const override { return stats_.num(); }
|
|
virtual double Median() const override;
|
|
virtual double Percentile(double p) const override;
|
|
virtual double Average() const override;
|
|
virtual double StandardDeviation() const override;
|
|
virtual void Data(HistogramData* const data) const override;
|
|
|
|
private:
|
|
void TimerTick();
|
|
void SwapHistoryBucket();
|
|
inline uint64_t current_window() const {
|
|
return current_window_.load(std::memory_order_relaxed);
|
|
}
|
|
inline uint64_t last_swap_time() const{
|
|
return last_swap_time_.load(std::memory_order_relaxed);
|
|
}
|
|
|
|
Env* env_;
|
|
std::mutex mutex_;
|
|
|
|
// Aggregated stats over windows_stats_, all the computation is done
|
|
// upon aggregated values
|
|
HistogramStat stats_;
|
|
|
|
// This is a circular array representing the latest N time-windows.
|
|
// Each entry stores a time-window of data. Expiration is done
|
|
// on window-based.
|
|
std::unique_ptr<HistogramStat[]> window_stats_;
|
|
|
|
std::atomic_uint_fast64_t current_window_;
|
|
std::atomic_uint_fast64_t last_swap_time_;
|
|
|
|
// Following parameters are configuable
|
|
uint64_t num_windows_ = 5;
|
|
uint64_t micros_per_window_ = 60000000;
|
|
// By default, don't care about the number of values in current window
|
|
// when decide whether to swap windows or not.
|
|
uint64_t min_num_per_window_ = 0;
|
|
};
|
|
|
|
} // namespace rocksdb
|