02b57dedb7
PR for adding microbenchmarking infrastructure for NVPTX. `nvlink` cannot perform LTO, so we cannot inline `libc` functions and this function call overhead is not adjusted for during microbenchmarking.
109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
#ifndef LLVM_LIBC_BENCHMARKS_LIBC_GPU_BENCHMARK_H
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#define LLVM_LIBC_BENCHMARKS_LIBC_GPU_BENCHMARK_H
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#include "benchmarks/gpu/BenchmarkLogger.h"
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#include "benchmarks/gpu/timing/timing.h"
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#include "src/__support/CPP/functional.h"
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#include "src/__support/CPP/limits.h"
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#include "src/__support/CPP/string_view.h"
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#include "src/time/clock.h"
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#include <stdint.h>
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namespace LIBC_NAMESPACE {
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namespace benchmarks {
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struct BenchmarkOptions {
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uint32_t initial_iterations = 1;
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uint32_t max_iterations = 10000000;
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uint32_t min_samples = 4;
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uint32_t max_samples = 1000;
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uint64_t min_duration = 0; // in nanoseconds (ns)
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uint64_t max_duration = 1000 * 1000 * 1000; // 1e9 nanoseconds = 1 second
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double epsilon = 0.01;
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double scaling_factor = 1.4;
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};
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struct Measurement {
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uint32_t iterations = 0;
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uint64_t elapsed_cycles = 0;
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};
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class RefinableRuntimeEstimation {
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uint64_t total_cycles = 0;
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uint32_t total_iterations = 0;
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public:
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uint64_t update(const Measurement &M) {
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total_cycles += M.elapsed_cycles;
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total_iterations += M.iterations;
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return total_cycles / total_iterations;
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}
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};
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// Tracks the progression of the runtime estimation
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class RuntimeEstimationProgression {
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RefinableRuntimeEstimation rre;
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public:
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uint64_t current_estimation = 0;
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double compute_improvement(const Measurement &M) {
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const uint64_t new_estimation = rre.update(M);
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double ratio =
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(static_cast<double>(current_estimation) / new_estimation) - 1.0;
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// Get absolute value
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if (ratio < 0)
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ratio *= -1;
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current_estimation = new_estimation;
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return ratio;
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}
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};
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struct BenchmarkResult {
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uint64_t cycles = 0;
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double standard_deviation = 0;
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uint64_t min = UINT64_MAX;
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uint64_t max = 0;
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uint32_t samples = 0;
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uint32_t total_iterations = 0;
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clock_t total_time = 0;
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};
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BenchmarkResult benchmark(const BenchmarkOptions &options,
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cpp::function<uint64_t(void)> wrapper_func);
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class Benchmark {
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const cpp::function<uint64_t(void)> func;
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const cpp::string_view name;
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public:
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Benchmark(cpp::function<uint64_t(void)> func, char const *name)
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: func(func), name(name) {
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add_benchmark(this);
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}
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static void run_benchmarks();
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protected:
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static void add_benchmark(Benchmark *benchmark);
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private:
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BenchmarkResult run() {
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BenchmarkOptions options;
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return benchmark(options, func);
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}
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const cpp::string_view get_name() const { return name; }
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};
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} // namespace benchmarks
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} // namespace LIBC_NAMESPACE
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#define BENCHMARK(SuiteName, TestName, Func) \
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LIBC_NAMESPACE::benchmarks::Benchmark SuiteName##_##TestName##_Instance( \
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Func, #SuiteName "." #TestName);
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#endif
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