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Reduce compilation costs of benchmarks

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We replaced some simple std::algorithm usage by loops, and reduced
header inclusion.
This commit is contained in:
Martin Hořeňovský 2023-04-10 15:03:29 +02:00
parent 7d07efc92b
commit fe64c28925
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GPG Key ID: DE48307B8B0D381A
7 changed files with 55 additions and 40 deletions
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18
src/catch2/benchmark/catch_execution_plan.hpp
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@ -17,8 +17,7 @@
#include <catch2/benchmark/detail/catch_repeat.hpp>
#include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
#include <algorithm>
#include <iterator>
#include <vector>
namespace Catch {
namespace Benchmark {
@ -41,14 +40,17 @@ namespace Catch {
Detail::run_for_at_least<Clock>(std::chrono::duration_cast<ClockDuration<Clock>>(warmup_time), warmup_iterations, Detail::repeat(now<Clock>{}));
std::vector<FloatDuration<Clock>> times;
times.reserve(cfg.benchmarkSamples());
std::generate_n(std::back_inserter(times), cfg.benchmarkSamples(), [this, env] {
const auto num_samples = cfg.benchmarkSamples();
times.reserve( num_samples );
for ( size_t i = 0; i < num_samples; ++i ) {
Detail::ChronometerModel<Clock> model;
this->benchmark(Chronometer(model, iterations_per_sample));
this->benchmark( Chronometer( model, iterations_per_sample ) );
auto sample_time = model.elapsed() - env.clock_cost.mean;
if (sample_time < FloatDuration<Clock>::zero()) sample_time = FloatDuration<Clock>::zero();
return sample_time / iterations_per_sample;
});
if ( sample_time < FloatDuration<Clock>::zero() ) {
sample_time = FloatDuration<Clock>::zero();
}
times.push_back(sample_time / iterations_per_sample);
}
return times;
}
};

7
src/catch2/benchmark/catch_sample_analysis.hpp
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@ -10,14 +10,11 @@
#ifndef CATCH_SAMPLE_ANALYSIS_HPP_INCLUDED
#define CATCH_SAMPLE_ANALYSIS_HPP_INCLUDED
#include <catch2/benchmark/catch_clock.hpp>
#include <catch2/benchmark/catch_estimate.hpp>
#include <catch2/benchmark/catch_outlier_classification.hpp>
#include <catch2/internal/catch_move_and_forward.hpp>
#include <algorithm>
#include <vector>
#include <iterator>
namespace Catch {
namespace Benchmark {
@ -33,7 +30,9 @@ namespace Catch {
operator SampleAnalysis<Duration2>() const {
std::vector<Duration2> samples2;
samples2.reserve(samples.size());
std::transform(samples.begin(), samples.end(), std::back_inserter(samples2), [](Duration d) { return Duration2(d); });
for (auto const& d : samples) {
samples2.push_back(Duration2(d));
}
return {
CATCH_MOVE(samples2),
mean,

11
src/catch2/benchmark/detail/catch_analyse.hpp
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@ -16,8 +16,6 @@
#include <catch2/interfaces/catch_interfaces_config.hpp>
#include <catch2/internal/catch_move_and_forward.hpp>
#include <algorithm>
#include <iterator>
#include <vector>
namespace Catch {
@ -28,7 +26,9 @@ namespace Catch {
if (!cfg.benchmarkNoAnalysis()) {
std::vector<double> samples;
samples.reserve(static_cast<size_t>(last - first));
std::transform(first, last, std::back_inserter(samples), [](Duration d) { return d.count(); });
for (auto current = first; current != last; ++current) {
samples.push_back( current->count() );
}
auto analysis = Catch::Benchmark::Detail::analyse_samples(cfg.benchmarkConfidenceInterval(), cfg.benchmarkResamples(), samples.begin(), samples.end());
auto outliers = Catch::Benchmark::Detail::classify_outliers(samples.begin(), samples.end());
@ -43,7 +43,10 @@ namespace Catch {
};
std::vector<Duration> samples2;
samples2.reserve(samples.size());
std::transform(samples.begin(), samples.end(), std::back_inserter(samples2), [](double d) { return Duration(d); });
for (auto s : samples) {
samples2.push_back( Duration( s ) );
}
return {
CATCH_MOVE(samples2),
wrap_estimate(analysis.mean),

20
src/catch2/benchmark/detail/catch_estimate_clock.hpp
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@ -19,7 +19,6 @@
#include <catch2/internal/catch_unique_ptr.hpp>
#include <algorithm>
#include <iterator>
#include <vector>
#include <cmath>
@ -30,13 +29,16 @@ namespace Catch {
std::vector<double> resolution(int k) {
std::vector<TimePoint<Clock>> times;
times.reserve(static_cast<size_t>(k + 1));
std::generate_n(std::back_inserter(times), k + 1, now<Clock>{});
for ( int i = 0; i < k + 1; ++i ) {
times.push_back( Clock::now() );
}
std::vector<double> deltas;
deltas.reserve(static_cast<size_t>(k));
std::transform(std::next(times.begin()), times.end(), times.begin(),
std::back_inserter(deltas),
[](TimePoint<Clock> a, TimePoint<Clock> b) { return static_cast<double>((a - b).count()); });
for ( size_t idx = 1; idx < times.size(); ++idx ) {
deltas.push_back( static_cast<double>(
( times[idx] - times[idx - 1] ).count() ) );
}
return deltas;
}
@ -84,9 +86,11 @@ namespace Catch {
std::vector<double> times;
int nsamples = static_cast<int>(std::ceil(time_limit / r.elapsed));
times.reserve(static_cast<size_t>(nsamples));
std::generate_n(std::back_inserter(times), nsamples, [time_clock, &r] {
return static_cast<double>((time_clock(r.iterations) / r.iterations).count());
});
for ( int s = 0; s < nsamples; ++s ) {
times.push_back( static_cast<double>(
( time_clock( r.iterations ) / r.iterations )
.count() ) );
}
return {
FloatDuration<Clock>(mean(times.begin(), times.end())),
classify_outliers(times.begin(), times.end()),

21
src/catch2/benchmark/detail/catch_stats.cpp
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@ -13,7 +13,7 @@
#include <cassert>
#include <cstddef>
#include <iterator>
#include <numeric>
#include <random>
@ -35,12 +35,19 @@ using Catch::Benchmark::Detail::sample;
sample out;
out.reserve(resamples);
std::generate_n(std::back_inserter(out), resamples, [n, first, &estimator, &dist, &rng] {
std::vector<double> resampled;
resampled.reserve(n);
std::generate_n(std::back_inserter(resampled), n, [first, &dist, &rng] { return first[static_cast<std::ptrdiff_t>(dist(rng))]; });
return estimator(resampled.begin(), resampled.end());
});
// We allocate the vector outside the loop to avoid realloc per resample
std::vector<double> resampled;
resampled.reserve( n );
for ( size_t i = 0; i < resamples; ++i ) {
resampled.clear();
for ( size_t s = 0; s < n; ++s ) {
resampled.push_back(
first[static_cast<std::ptrdiff_t>( dist( rng ) )] );
}
const auto estimate =
estimator( resampled.begin(), resampled.end() );
out.push_back( estimate );
}
std::sort(out.begin(), out.end());
return out;
}

16
src/catch2/benchmark/detail/catch_stats.hpp
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@ -15,8 +15,6 @@
#include <algorithm>
#include <vector>
#include <numeric>
#include <tuple>
#include <cmath>
namespace Catch {
@ -77,13 +75,13 @@ namespace Catch {
sample jack = jackknife(estimator, first, last);
double jack_mean = mean(jack.begin(), jack.end());
double sum_squares, sum_cubes;
std::tie(sum_squares, sum_cubes) = std::accumulate(jack.begin(), jack.end(), std::make_pair(0., 0.), [jack_mean](std::pair<double, double> sqcb, double x) -> std::pair<double, double> {
auto d = jack_mean - x;
auto d2 = d * d;
auto d3 = d2 * d;
return { sqcb.first + d2, sqcb.second + d3 };
});
double sum_squares = 0, sum_cubes = 0;
for (double x : jack) {
auto difference = jack_mean - x;
auto square = difference * difference;
auto cube = square * difference;
sum_squares += square; sum_cubes += cube;
}
double accel = sum_cubes / (6 * std::pow(sum_squares, 1.5));
long n = static_cast<long>(resample.size());

2
tests/SelfTest/IntrospectiveTests/InternalBenchmark.tests.cpp
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@ -22,6 +22,8 @@
#include <catch2/benchmark/detail/catch_benchmark_function.hpp>
#include <catch2/benchmark/detail/catch_estimate_clock.hpp>
#include <numeric>
namespace {
struct manual_clock {
public: