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llvm-project/libc/benchmarks/LibcMemoryBenchmarkMain.cpp

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//===-- Benchmark ---------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "JSON.h"
#include "LibcBenchmark.h"
#include "LibcMemoryBenchmark.h"
#include "MemorySizeDistributions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <cstring>
#include <unistd.h>
namespace __llvm_libc {
extern void *memcpy(void *__restrict, const void *__restrict, size_t);
extern void *memset(void *, int, size_t);
extern void bzero(void *, size_t);
extern int memcmp(const void *, const void *, size_t);
extern int bcmp(const void *, const void *, size_t);
} // namespace __llvm_libc
namespace llvm {
namespace libc_benchmarks {
static cl::opt<std::string>
StudyName("study-name", cl::desc("The name for this study"), cl::Required);
static cl::opt<std::string>
SizeDistributionName("size-distribution-name",
cl::desc("The name of the distribution to use"));
static cl::opt<bool>
SweepMode("sweep-mode",
cl::desc("If set, benchmark all sizes from 0 to sweep-max-size"));
static cl::opt<uint32_t>
SweepMaxSize("sweep-max-size",
cl::desc("The maximum size to use in sweep-mode"),
cl::init(256));
static cl::opt<uint32_t>
AlignedAccess("aligned-access",
cl::desc("The alignment to use when accessing the buffers\n"
"Default is unaligned\n"
"Use 0 to disable address randomization"),
cl::init(1));
static cl::opt<std::string> Output("output",
cl::desc("Specify output filename"),
cl::value_desc("filename"), cl::init("-"));
static cl::opt<uint32_t>
NumTrials("num-trials", cl::desc("The number of benchmarks run to perform"),
cl::init(1));
#if defined(LIBC_BENCHMARK_FUNCTION_MEMCPY)
#define LIBC_BENCHMARK_FUNCTION LIBC_BENCHMARK_FUNCTION_MEMCPY
using BenchmarkSetup = CopySetup;
#elif defined(LIBC_BENCHMARK_FUNCTION_MEMSET)
#define LIBC_BENCHMARK_FUNCTION LIBC_BENCHMARK_FUNCTION_MEMSET
using BenchmarkSetup = SetSetup;
#elif defined(LIBC_BENCHMARK_FUNCTION_BZERO)
#define LIBC_BENCHMARK_FUNCTION LIBC_BENCHMARK_FUNCTION_BZERO
using BenchmarkSetup = SetSetup;
#elif defined(LIBC_BENCHMARK_FUNCTION_MEMCMP)
#define LIBC_BENCHMARK_FUNCTION LIBC_BENCHMARK_FUNCTION_MEMCMP
using BenchmarkSetup = ComparisonSetup;
#elif defined(LIBC_BENCHMARK_FUNCTION_BCMP)
#define LIBC_BENCHMARK_FUNCTION LIBC_BENCHMARK_FUNCTION_BCMP
using BenchmarkSetup = ComparisonSetup;
#else
#error "Missing LIBC_BENCHMARK_FUNCTION_XXX definition"
#endif
struct MemfunctionBenchmarkBase : public BenchmarkSetup {
MemfunctionBenchmarkBase() : ReportProgress(isatty(fileno(stdout))) {}
virtual ~MemfunctionBenchmarkBase() {}
virtual Study run() = 0;
CircularArrayRef<ParameterBatch::ParameterType>
generateBatch(size_t Iterations) {
randomize();
return cycle(makeArrayRef(Parameters), Iterations);
}
protected:
Study createStudy() {
Study Study;
// Setup study.
Study.StudyName = StudyName;
Runtime &RI = Study.Runtime;
RI.Host = HostState::get();
RI.BufferSize = BufferSize;
RI.BatchParameterCount = BatchSize;
BenchmarkOptions &BO = RI.BenchmarkOptions;
BO.MinDuration = std::chrono::milliseconds(1);
BO.MaxDuration = std::chrono::seconds(1);
BO.MaxIterations = 10'000'000U;
BO.MinSamples = 4;
BO.MaxSamples = 1000;
BO.Epsilon = 0.01; // 1%
BO.ScalingFactor = 1.4;
StudyConfiguration &SC = Study.Configuration;
SC.NumTrials = NumTrials;
SC.IsSweepMode = SweepMode;
SC.AccessAlignment = MaybeAlign(AlignedAccess);
SC.Function = LIBC_BENCHMARK_FUNCTION_NAME;
return Study;
}
void runTrials(const BenchmarkOptions &Options,
std::vector<Duration> &Measurements) {
for (size_t i = 0; i < NumTrials; ++i) {
const BenchmarkResult Result = benchmark(
Options, *this, [this](ParameterBatch::ParameterType Parameter) {
return Call(Parameter, LIBC_BENCHMARK_FUNCTION);
});
Measurements.push_back(Result.BestGuess);
reportProgress(Measurements);
}
}
virtual void randomize() = 0;
private:
bool ReportProgress;
void reportProgress(const std::vector<Duration> &Measurements) {
if (!ReportProgress)
return;
static size_t LastPercent = -1;
const size_t TotalSteps = Measurements.capacity();
const size_t Steps = Measurements.size();
const size_t Percent = 100 * Steps / TotalSteps;
if (Percent == LastPercent)
return;
LastPercent = Percent;
size_t I = 0;
errs() << '[';
for (; I <= Percent; ++I)
errs() << '#';
for (; I <= 100; ++I)
errs() << '_';
errs() << "] " << Percent << '%' << '\r';
}
};
struct MemfunctionBenchmarkSweep final : public MemfunctionBenchmarkBase {
MemfunctionBenchmarkSweep()
: OffsetSampler(MemfunctionBenchmarkBase::BufferSize, SweepMaxSize,
MaybeAlign(AlignedAccess)) {}
virtual void randomize() override {
for (auto &P : Parameters) {
P.OffsetBytes = OffsetSampler(Gen);
P.SizeBytes = CurrentSweepSize;
checkValid(P);
}
}
virtual Study run() override {
Study Study = createStudy();
Study.Configuration.SweepModeMaxSize = SweepMaxSize;
BenchmarkOptions &BO = Study.Runtime.BenchmarkOptions;
BO.MinDuration = std::chrono::milliseconds(1);
BO.InitialIterations = 100;
auto &Measurements = Study.Measurements;
Measurements.reserve(NumTrials * SweepMaxSize);
for (size_t Size = 0; Size <= SweepMaxSize; ++Size) {
CurrentSweepSize = Size;
runTrials(BO, Measurements);
}
return Study;
}
private:
size_t CurrentSweepSize = 0;
OffsetDistribution OffsetSampler;
std::mt19937_64 Gen;
};
struct MemfunctionBenchmarkDistribution final
: public MemfunctionBenchmarkBase {
MemfunctionBenchmarkDistribution(MemorySizeDistribution Distribution)
: Distribution(Distribution), Probabilities(Distribution.Probabilities),
SizeSampler(Probabilities.begin(), Probabilities.end()),
OffsetSampler(MemfunctionBenchmarkBase::BufferSize,
Probabilities.size() - 1, MaybeAlign(AlignedAccess)) {}
virtual void randomize() override {
for (auto &P : Parameters) {
P.OffsetBytes = OffsetSampler(Gen);
P.SizeBytes = SizeSampler(Gen);
checkValid(P);
}
}
virtual Study run() override {
Study Study = createStudy();
Study.Configuration.SizeDistributionName = Distribution.Name.str();
BenchmarkOptions &BO = Study.Runtime.BenchmarkOptions;
BO.MinDuration = std::chrono::milliseconds(10);
BO.InitialIterations = BatchSize * 10;
auto &Measurements = Study.Measurements;
Measurements.reserve(NumTrials);
runTrials(BO, Measurements);
return Study;
}
private:
MemorySizeDistribution Distribution;
ArrayRef<double> Probabilities;
std::discrete_distribution<unsigned> SizeSampler;
OffsetDistribution OffsetSampler;
std::mt19937_64 Gen;
};
void writeStudy(const Study &S) {
std::error_code EC;
raw_fd_ostream FOS(Output, EC);
if (EC)
report_fatal_error(Twine("Could not open file: ")
.concat(EC.message())
.concat(", ")
.concat(Output));
json::OStream JOS(FOS);
serializeToJson(S, JOS);
FOS << "\n";
}
void main() {
checkRequirements();
if (!isPowerOf2_32(AlignedAccess))
report_fatal_error(AlignedAccess.ArgStr +
Twine(" must be a power of two or zero"));
const bool HasDistributionName = !SizeDistributionName.empty();
if (SweepMode && HasDistributionName)
report_fatal_error("Select only one of `--" + Twine(SweepMode.ArgStr) +
"` or `--" + Twine(SizeDistributionName.ArgStr) + "`");
std::unique_ptr<MemfunctionBenchmarkBase> Benchmark;
if (SweepMode)
Benchmark.reset(new MemfunctionBenchmarkSweep());
else
Benchmark.reset(new MemfunctionBenchmarkDistribution(getDistributionOrDie(
BenchmarkSetup::getDistributions(), SizeDistributionName)));
writeStudy(Benchmark->run());
}
} // namespace libc_benchmarks
} // namespace llvm
#ifndef NDEBUG
#error For reproducibility benchmarks should not be compiled in DEBUG mode.
#endif
int main(int argc, char **argv) {
llvm::cl::ParseCommandLineOptions(argc, argv);
llvm::libc_benchmarks::main();
return EXIT_SUCCESS;
}
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