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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/base/counter.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/util/clock_source.h"
#include "mongo/util/duration.h"
#include "mongo/util/out_of_line_executor.h"
namespace mongo {
/**
* A utility to collect stats for tasks scheduled on an executor (e.g., the reactor thread).
*
* This class expects a clock source to measure the waiting and execution time of tasks. The clock
* source must always outlive instances of this class.
*
* This class collects stats for any task that is wrapped using `wrapTask`. The wrapped task may
* never outlive the instance of `ExecutorStats`.
*
* All public interfaces for this class are thread-safe.
*/
class ExecutorStats {
public:
explicit ExecutorStats(ClockSource* clkSource) : _clkSource(clkSource) {}
using Task = OutOfLineExecutor::Task;
Task wrapTask(Task&&);
void serialize(BSONObjBuilder* bob) const;
static constexpr auto kNumBuckets = 22;
private:
Counter64 _scheduled;
Counter64 _executed;
/**
* The following maintain histograms for tasks scheduled on the executor:
* `_waitingBuckets` represents the waiting time for the tasks pending execution.
* `_runningBuckets` keeps track of execution time of individual tasks after completion.
* Buckets 0 represents any recorded latency less than 1 milliseconds.
* Buckets 1 to 20 represent the 1-999 ms range.
* The last bucket represents any recorded latency that exceeds one second.
*/
Counter64 _waitingBuckets[kNumBuckets];
Counter64 _runningBuckets[kNumBuckets];
ClockSource* const _clkSource;
};
} // namespace mongo
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