library/UnitTests/LibUtilities/VmathTimer/main.cpp File Reference

#include <LibUtilities/BasicUtils/SharedArray.hpp>
#include <LibUtilities/BasicUtils/VmathArray.hpp>
#include <LibUtilities/SimdLib/tinysimd.hpp>
#include <LibUtilities/BasicUtils/Likwid.hpp>
#include <LibUtilities/BasicUtils/Timer.h>

Go to the source code of this file.

Functions
int	main (int argc, char const *argv[])

Function Documentation

main()

int main	(	int	argc,
		char const *	argv[]
	)

Definition at line 44 of file library/UnitTests/LibUtilities/VmathTimer/main.cpp.

{
 
    LIKWID_MARKER_INIT;
    LIKWID_MARKER_THREADINIT;
    LIKWID_MARKER_REGISTER("GathrArray");
    LIKWID_MARKER_REGISTER("GathrScalar");
    LIKWID_MARKER_REGISTER("GathrSimd");
 
    size_t nPts;
    int count   = 0;
    double time = 0.0;
 
#ifndef NEKTAR_USE_LIKWID
    boost::ignore_unused(count, time);
#endif
 
    if (argc < 2)
    {
        nPts = 100;
    }
    else
    {
        nPts = std::stoi(argv[1]);
    }
 
    std::cout << "number of points\t" << nPts << '\n';
 
    // number of experiments
    constexpr size_t experiments = 1 << 18;
    {
        // data should be randomized
        Array<OneD, NekDouble> data{nPts * 10, 0.0};
        Array<OneD, NekDouble> dataTrace{nPts, 0.0};
        size_t zero = 0;
        Array<OneD, size_t> indexTrace{nPts, zero};
 
        // inizialize index (should be randomized)
        for (size_t i = 0; i < nPts; ++i)
        {
            indexTrace[i] = i;
        }
 
        LIKWID_MARKER_START("GathrArray");
        for (size_t j = 0; j < experiments; ++j)
        {
            // time
            Vmath::Gathr(nPts, data, indexTrace, dataTrace);
        }
        LIKWID_MARKER_STOP("GathrArray");
        // get likwid events
        constexpr short CPU_CLK_UNHALTED_REF_id = 2;
        int nevents{20};
        std::vector<double> events(nevents);
        //
        LIKWID_MARKER_GET("GathrArray", &nevents, events.data(), &time, &count);
        // print out CPE
        double cpeGathrArray =
            events[CPU_CLK_UNHALTED_REF_id] / nPts / experiments;
        std::cout << "GathrArray likwid CPE\t" << cpeGathrArray << '\n';
        std::cout << dataTrace[0] << std::endl;
    }
 
    {
        // data should be randomized
        Array<OneD, NekDouble> data{nPts * 10, 0.0};
        Array<OneD, NekDouble> dataTrace{nPts, 0.0};
        size_t zero = 0;
        Array<OneD, size_t> indexTrace{nPts, zero};
 
        // inizialize index (should be randomized)
        for (size_t i = 0; i < nPts; ++i)
        {
            indexTrace[i] = i;
        }
 
        LIKWID_MARKER_START("GathrSimd");
        for (size_t j = 0; j < experiments; ++j)
        {
            // time
            Vmath::SIMD::Gathr(nPts, data.data(), indexTrace.data(),
                               dataTrace.data());
        }
        LIKWID_MARKER_STOP("GathrSimd");
        // get likwid events
        constexpr short CPU_CLK_UNHALTED_REF_id = 2;
        int nevents{20};
        std::vector<double> events(nevents);
        //
        LIKWID_MARKER_GET("GathrSimd", &nevents, events.data(), &time, &count);
        // print out CPE
        double cpeGathrSimd =
            events[CPU_CLK_UNHALTED_REF_id] / nPts / experiments;
        std::cout << "GathrSimd likwid CPE\t" << cpeGathrSimd << '\n';
        std::cout << dataTrace[0] << std::endl;
    }
 
    {
        // data should be randomized
        Array<OneD, NekDouble> data{nPts * 10, 0.0};
        Array<OneD, NekDouble> dataTrace{nPts, 0.0};
        size_t zero = 0;
        Array<OneD, size_t> indexTrace{nPts, zero};
 
        // inizialize index (should be randomized)
        for (size_t i = 0; i < nPts; ++i)
        {
            indexTrace[i] = i;
        }
 
        LIKWID_MARKER_START("GathrScalar");
        for (size_t j = 0; j < experiments; ++j)
        {
            // time
            Vmath::Gathr(nPts, data.data(), indexTrace.data(),
                         dataTrace.data());
        }
        LIKWID_MARKER_STOP("GathrScalar");
        // get likwid events
        constexpr short CPU_CLK_UNHALTED_REF_id = 2;
        int nevents{20};
        std::vector<double> events(nevents);
        //
        LIKWID_MARKER_GET("GathrScalar", &nevents, events.data(), &time,
                          &count);
        // print out CPE
        double cpeGathrScalar =
            events[CPU_CLK_UNHALTED_REF_id] / nPts / experiments;
        std::cout << "GathrScalar likwid CPE\t" << cpeGathrScalar << '\n';
        std::cout << dataTrace[0] << std::endl;
    }
 
    LIKWID_MARKER_CLOSE;
}

References Vmath::SIMD::Gathr(), Vmath::Gathr(), LIKWID_MARKER_CLOSE, LIKWID_MARKER_GET, LIKWID_MARKER_INIT, LIKWID_MARKER_REGISTER, LIKWID_MARKER_START, LIKWID_MARKER_STOP, and LIKWID_MARKER_THREADINIT.