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7072c544b5
Avoid calling gettimeofday every time through the benchmarking loop, by keeping track of how long each loop takes and doubling the number of iterations done between time checks when they take less than 1/16'th of the total elapsed time.
71 lines
2 KiB
C++
71 lines
2 KiB
C++
// Copyright (c) 2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_BENCH_H
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#define BITCOIN_BENCH_H
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// Simple micro-benchmarking framework; API mostly matches a subset of the Google Benchmark
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// framework (see https://github.com/google/benchmark)
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// Wny not use the Google Benchmark framework? Because adding Yet Another Dependency
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// (that uses cmake as its build system and has lots of features we don't need) isn't
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// worth it.
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/*
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* Usage:
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static void CODE_TO_TIME(benchmark::State& state)
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{
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... do any setup needed...
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while (state.KeepRunning()) {
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... do stuff you want to time...
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}
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... do any cleanup needed...
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}
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BENCHMARK(CODE_TO_TIME);
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*/
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#include <boost/function.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/stringize.hpp>
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#include <map>
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#include <string>
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namespace benchmark {
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class State {
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std::string name;
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double maxElapsed;
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double beginTime;
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double lastTime, minTime, maxTime;
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int64_t count;
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int64_t timeCheckCount;
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public:
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State(std::string _name, double _maxElapsed) : name(_name), maxElapsed(_maxElapsed), count(0) {
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minTime = std::numeric_limits<double>::max();
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maxTime = std::numeric_limits<double>::min();
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timeCheckCount = 1;
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}
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bool KeepRunning();
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};
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typedef boost::function<void(State&)> BenchFunction;
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class BenchRunner
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{
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static std::map<std::string, BenchFunction> benchmarks;
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public:
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BenchRunner(std::string name, BenchFunction func);
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static void RunAll(double elapsedTimeForOne=1.0);
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};
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}
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// BENCHMARK(foo) expands to: benchmark::BenchRunner bench_11foo("foo", foo);
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#define BENCHMARK(n) \
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benchmark::BenchRunner BOOST_PP_CAT(bench_, BOOST_PP_CAT(__LINE__, n))(BOOST_PP_STRINGIZE(n), n);
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#endif // BITCOIN_BENCH_H
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