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// Copyright (c) 2015-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_BENCH_BENCH_H
#define BITCOIN_BENCH_BENCH_H
#include <functional>
#include <limits>
#include <map>
#include <string>
#include <chrono>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/stringize.hpp>
// Simple micro-benchmarking framework; API mostly matches a subset of the Google Benchmark
// framework (see https://github.com/google/benchmark)
// Why not use the Google Benchmark framework? Because adding Yet Another Dependency
// (that uses cmake as its build system and has lots of features we don't need) isn't
// worth it.
/*
* Usage:
static void CODE_TO_TIME(benchmark::State& state)
{
... do any setup needed...
while (state.KeepRunning()) {
... do stuff you want to time...
}
... do any cleanup needed...
}
BENCHMARK(CODE_TO_TIME);
*/
namespace benchmark {
// On many systems, the high_resolution_clock offers no better resolution than the steady_clock.
// If that's the case, prefer the steady_clock.
struct best_clock {
using hi_res_clock = std::chrono::high_resolution_clock;
using steady_clock = std::chrono::steady_clock;
static constexpr bool steady_is_high_res = std::ratio_less_equal<steady_clock::period, hi_res_clock::period>::value;
using type = std::conditional<steady_is_high_res, steady_clock, hi_res_clock>::type;
};
using clock = best_clock::type;
using time_point = clock::time_point;
using duration = clock::duration;
class State {
std::string name;
duration maxElapsed;
time_point beginTime, lastTime;
duration minTime, maxTime;
uint64_t count;
uint64_t countMask;
uint64_t beginCycles;
uint64_t lastCycles;
uint64_t minCycles;
uint64_t maxCycles;
public:
State(std::string _name, duration _maxElapsed) : name(_name), maxElapsed(_maxElapsed), count(0) {
minTime = duration::max();
maxTime = duration::zero();
minCycles = std::numeric_limits<uint64_t>::max();
maxCycles = std::numeric_limits<uint64_t>::min();
countMask = 1;
}
bool KeepRunning();
};
typedef std::function<void(State&)> BenchFunction;
class BenchRunner
{
typedef std::map<std::string, BenchFunction> BenchmarkMap;
static BenchmarkMap &benchmarks();
public:
BenchRunner(std::string name, BenchFunction func);
static void RunAll(duration elapsedTimeForOne = std::chrono::seconds(1));
};
}
// BENCHMARK(foo) expands to: benchmark::BenchRunner bench_11foo("foo", foo);
#define BENCHMARK(n) \
benchmark::BenchRunner BOOST_PP_CAT(bench_, BOOST_PP_CAT(__LINE__, n))(BOOST_PP_STRINGIZE(n), n);
#endif // BITCOIN_BENCH_BENCH_H
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