ParallelFor.cpp

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#include "cloudViewer/core/ParallelFor.h"
 
#include <benchmark/benchmark.h>
 
#include <numeric>
#include <vector>
 
namespace cloudViewer {
namespace core {
 
void ParallelForScalar(benchmark::State& state, int size) {
    std::vector<float> input(size);
    std::vector<float> output(size);
    std::iota(input.begin(), input.end(), 0.0f);
 
    // Warmup.
    {
        core::ParallelFor(core::Device("CPU:0"), size, [&](int64_t idx) {
            float x = input[idx];
            float x2 = x * x;
            output[idx] = x2;
        });
    }
 
    for (auto _ : state) {
        core::ParallelFor(core::Device("CPU:0"), size, [&](int64_t idx) {
            float x = input[idx];
            float x2 = x * x;
            output[idx] = x2;
        });
    }
}
 
void ParallelForVectorized(benchmark::State& state, int size) {
    std::vector<float> input(size);
    std::vector<float> output(size);
    std::iota(input.begin(), input.end(), 0.0f);
 
    // Warmup.
    {
        core::ParallelFor(
                core::Device("CPU:0"), size,
                [&](int64_t idx) {
                    float x = input[idx];
                    float x2 = x * x;
                    output[idx] = x2;
                },
                CLOUDVIEWER_VECTORIZED(SquareKernel, input.data(),
                                       output.data()));
    }
 
    for (auto _ : state) {
        core::ParallelFor(
                core::Device("CPU:0"), size,
                [&](int64_t idx) {
                    float x = input[idx];
                    float x2 = x * x;
                    output[idx] = x2;
                },
                CLOUDVIEWER_VECTORIZED(SquareKernel, input.data(),
                                       output.data()));
    }
}
 
#define ENUM_BM_SIZE(FN)                                                       \
    BENCHMARK_CAPTURE(FN, CPU##100, 100)->Unit(benchmark::kMicrosecond);       \
    BENCHMARK_CAPTURE(FN, CPU##1000, 1000)->Unit(benchmark::kMicrosecond);     \
    BENCHMARK_CAPTURE(FN, CPU##10000, 10000)->Unit(benchmark::kMicrosecond);   \
    BENCHMARK_CAPTURE(FN, CPU##100000, 100000)->Unit(benchmark::kMicrosecond); \
    BENCHMARK_CAPTURE(FN, CPU##1000000, 1000000)                               \
            ->Unit(benchmark::kMicrosecond);                                   \
    BENCHMARK_CAPTURE(FN, CPU##10000000, 10000000)                             \
            ->Unit(benchmark::kMicrosecond);                                   \
    BENCHMARK_CAPTURE(FN, CPU##100000000, 100000000)                           \
            ->Unit(benchmark::kMicrosecond);
 
ENUM_BM_SIZE(ParallelForScalar)
ENUM_BM_SIZE(ParallelForVectorized)
 
}  // namespace core
}  // namespace cloudViewer