Vec3DSpeedTest.cpp

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//Copyright (c) 2013-2014, The MercuryDPM Developers Team. All rights reserved.
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#include<iostream>
#include "Math/Vector.h"
#include "Math/Matrix.h"
#include "MercuryTime.h"

//not really useful functions as it does not return anything; simply for speed testing.

Mdouble passByReference(Vec3D& v)
{
    return v.X;
}

Mdouble passByConstReference(const Vec3D& v)
{
    return v.X;
}

Mdouble passByPointer(Vec3D* v)
{
    return v->X;
}

Mdouble passByValue(Vec3D v)
{
    return v.X;
}

Mdouble passByReference(Matrix3D& v)
{
    return v.XX;
}

Mdouble passByConstReference(const Matrix3D& v)
{
    return v.XX;
}

Mdouble passByPointer(Matrix3D* v)
{
    return v->XX;
}

Mdouble passByValue(Matrix3D v)
{
    return v.XX;
}

void testVec3D(unsigned int n)
{
    std::cout << "testing Vec3D performance" << std::endl;
    
    Vec3D v={1,0,0};
    Mdouble x=0;
    
    Time time;
    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByReference(v);
    }
    std::cout << "passByReference      clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;

    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByConstReference(v);
    }
    std::cout << "passByConstReference clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;

    Vec3D* p = &v;
    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByPointer(p);
    }
    std::cout << "passByPointer        clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;
    
    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByValue(v);
    }
    std::cout << "passByValue          clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;
    std::cout << x << std::endl;
}

void testMatrix3D(unsigned int n)
{
    std::cout << "testing Matrix3D performance" << std::endl;

    Matrix3D v={1,0,0,0,0,0,0,0,0};
    Mdouble x=0;
    
    Time time;
    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByReference(v);
    }
    std::cout << "passByReference      clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;

    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByConstReference(v);
    }
    std::cout << "passByConstReference clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;

    Matrix3D* p = &v;
    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByPointer(p);
    }
    std::cout << "passByPointer        clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;
    
    time.tic();
    for (unsigned int i = 0; i < n; i++)
    {
        x+=passByValue(v);
    }
    std::cout << "passByValue          clocks: " << time.toc()*CLOCKS_PER_SEC << std::endl;
    std::cout << x << std::endl;
}

int main()
{
    unsigned int n = 1e8;
    testVec3D(n);
    testMatrix3D(n);
    return 0;
}