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https://github.com/facebook/sapling.git
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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
68 lines
1.5 KiB
C++
68 lines
1.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <stdint.h>
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#include <algorithm>
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#include <condition_variable>
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#include <limits>
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#include <mutex>
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namespace facebook {
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namespace eden {
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/**
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* Accumulates data points, tracking their average and minimum.
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*
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* This type is a monoid.
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*/
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class StatAccumulator {
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public:
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void add(uint64_t value) {
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minimum_ = std::min(minimum_, value);
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total_ += value;
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++count_;
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}
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void combine(StatAccumulator other) {
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minimum_ = std::min(minimum_, other.minimum_);
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total_ += other.total_;
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count_ += other.count_;
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}
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uint64_t getMinimum() const {
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return minimum_;
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}
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uint64_t getAverage() const {
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return count_ ? total_ / count_ : 0;
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}
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private:
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uint64_t minimum_{std::numeric_limits<uint64_t>::max()};
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uint64_t total_{0};
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uint64_t count_{0};
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};
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/**
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* Returns the current time in nanoseconds since some epoch. A fast timer
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* suitable for benchmarking short operations.
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*/
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uint64_t getTime() noexcept;
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/**
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* Calls getTime several times and computes its average and minimum execution
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* times. Benchmarks that measure the cost of extremely fast operations
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* (nanoseconds) should print the clock overhead as well so the results can be
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* interpreted more accurately.
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*/
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StatAccumulator measureClockOverhead() noexcept;
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} // namespace eden
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} // namespace facebook
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