TestOpenCLSort.cpp

/* -------------------------------------------------------------------------- *
 *                                   OpenMM                                   *
 * -------------------------------------------------------------------------- *
 * This is part of the OpenMM molecular simulation toolkit originating from   *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org.               *
 *                                                                            *
 * Portions copyright (c) 2008-2009 Stanford University and the Authors.      *
 * Authors: Peter Eastman                                                     *
 * Contributors:                                                              *
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/**
 * This tests the OpenCL implementation of sorting.
 */

#include "../../../tests/AssertionUtilities.h"
#include "../src/OpenCLArray.h"
#include "../src/OpenCLContext.h"
#include "../src/OpenCLSort.h"
#include "../src/sfmt/SFMT.h"
#include "openmm/System.h"
#include <iostream>
#include <cmath>
#include <set>

using namespace OpenMM;
using namespace std;

void verifySorting(vector<float> array) {
    // Sort the array.

    System system;
    system.addParticle(0.0);
    OpenCLContext context(1, -1);
    context.initialize(system);
    OpenCLArray<float> data(context, array.size(), "sortData");
    data.upload(array);
    OpenCLSort<float> sort(context, array.size(), "float", "value");
    sort.sort(data);
    vector<float> sorted;
    data.download(sorted);

    // Verify that it is in sorted order.

    for (int i = 1; i < (int) sorted.size(); i++)
        ASSERT(sorted[i-1] <= sorted[i]);

    // Make sure the sorted array contains the same values as the original one.

    multiset<float> elements1(array.begin(), array.end());
    multiset<float> elements2(sorted.begin(), sorted.end());
    ASSERT(elements1 == elements2);
}

void testUniformValues()
{
    init_gen_rand(0);
    vector<float> array(10000);
    for (int i = 0; i < (int) array.size(); i++)
        array[i] = (float) genrand_real2();
    verifySorting(array);
}

void testLogValues()
{
    init_gen_rand(0);
    vector<float> array(10000);
    for (int i = 0; i < (int) array.size(); i++)
        array[i] = (float) log(genrand_real2());
    verifySorting(array);
}

int main() {
    try {
        testUniformValues();
        testLogValues();
    }
    catch(const exception& e) {
        cout << "exception: " << e.what() << endl;
        return 1;
    }
    cout << "Done" << endl;
    return 0;
}