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// Copyright (c) 2015-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <bench/bench.h>
#include <test/util/setup_common.h>
#include <util/fs.h>
#include <util/string.h>
#include <chrono>
#include <fstream>
#include <functional>
#include <iostream>
#include <map>
#include <regex>
#include <string>
#include <vector>
using namespace std::chrono_literals;
const std::function<void(const std::string&)> G_TEST_LOG_FUN{};
const std::function<std::vector<const char*>()> G_TEST_COMMAND_LINE_ARGUMENTS{};
namespace {
void GenerateTemplateResults(const std::vector<ankerl::nanobench::Result>& benchmarkResults, const fs::path& file, const char* tpl)
{
if (benchmarkResults.empty() || file.empty()) {
// nothing to write, bail out
return;
}
std::ofstream fout{file};
if (fout.is_open()) {
ankerl::nanobench::render(tpl, benchmarkResults, fout);
std::cout << "Created " << file << std::endl;
} else {
std::cout << "Could not write to file " << file << std::endl;
}
}
} // namespace
namespace benchmark {
// map a label to one or multiple priority levels
std::map<std::string, uint8_t> map_label_priority = {
{"high", PriorityLevel::HIGH},
{"low", PriorityLevel::LOW},
{"all", 0xff}
};
std::string ListPriorities()
{
using item_t = std::pair<std::string, uint8_t>;
auto sort_by_priority = [](item_t a, item_t b){ return a.second < b.second; };
std::set<item_t, decltype(sort_by_priority)> sorted_priorities(map_label_priority.begin(), map_label_priority.end(), sort_by_priority);
return Join(sorted_priorities, ',', [](const auto& entry){ return entry.first; });
}
uint8_t StringToPriority(const std::string& str)
{
auto it = map_label_priority.find(str);
if (it == map_label_priority.end()) throw std::runtime_error(strprintf("Unknown priority level %s", str));
return it->second;
}
BenchRunner::BenchmarkMap& BenchRunner::benchmarks()
{
static BenchmarkMap benchmarks_map;
return benchmarks_map;
}
BenchRunner::BenchRunner(std::string name, BenchFunction func, PriorityLevel level)
{
benchmarks().insert(std::make_pair(name, std::make_pair(func, level)));
}
void BenchRunner::RunAll(const Args& args)
{
std::regex reFilter(args.regex_filter);
std::smatch baseMatch;
if (args.sanity_check) {
std::cout << "Running with -sanity-check option, output is being suppressed as benchmark results will be useless." << std::endl;
}
std::vector<ankerl::nanobench::Result> benchmarkResults;
for (const auto& [name, bench_func] : benchmarks()) {
const auto& [func, priority_level] = bench_func;
if (!(priority_level & args.priority)) {
continue;
}
if (!std::regex_match(name, baseMatch, reFilter)) {
continue;
}
if (args.is_list_only) {
std::cout << name << std::endl;
continue;
}
Bench bench;
if (args.sanity_check) {
bench.epochs(1).epochIterations(1);
bench.output(nullptr);
}
bench.name(name);
if (args.min_time > 0ms) {
// convert to nanos before dividing to reduce rounding errors
std::chrono::nanoseconds min_time_ns = args.min_time;
bench.minEpochTime(min_time_ns / bench.epochs());
}
if (args.asymptote.empty()) {
func(bench);
} else {
for (auto n : args.asymptote) {
bench.complexityN(n);
func(bench);
}
std::cout << bench.complexityBigO() << std::endl;
}
if (!bench.results().empty()) {
benchmarkResults.push_back(bench.results().back());
}
}
GenerateTemplateResults(benchmarkResults, args.output_csv, "# Benchmark, evals, iterations, total, min, max, median\n"
"{{#result}}{{name}}, {{epochs}}, {{average(iterations)}}, {{sumProduct(iterations, elapsed)}}, {{minimum(elapsed)}}, {{maximum(elapsed)}}, {{median(elapsed)}}\n"
"{{/result}}");
GenerateTemplateResults(benchmarkResults, args.output_json, ankerl::nanobench::templates::json());
}
} // namespace benchmark
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