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package edu.emory.mathcs.jplasma.benchmark;

import org.netlib.util.intW;

import edu.emory.mathcs.jplasma.tdouble.Dplasma;
import edu.emory.mathcs.utils.ConcurrencyUtils;

/**
 * Benchmark of plasma_DPOSV
 * 
 * @author Piotr Wendykier (piotr.wendykier@gmail.com)
 * 
 */
public class DposvBenchmark {

    private static void dposvBenchmarkJPlasma(int N, int NRHS, int NITERS, int NTHREADS) {
        ConcurrencyUtils.setNumberOfThreads(NTHREADS);
        int LDA = N;
        int LDB = N;
        double[] A = new double[N * N];
        double[] B = new double[N * NRHS];
        double avtime = 0;
        Dplasma.plasma_Init(N, N, 1);

        for (int k = 0; k < NITERS + 2; k++) { //the first two iterations are just for warm-up

            for (int i = 0; i < N; i++) {
                for (int j = 0; j < N; j++) {
                    A[LDA * j + i] = 0.5 - Math.random();
                }
            }

            for (int i = 0; i < N; i++) {
                A[LDA * i + i] = A[LDA * i + i] + N;
            }

            for (int i = 0; i < N; i++) {
                for (int j = 0; j < N; j++) {
                    A[LDA * j + i] = A[LDA * i + j];
                }
            }

            for (int i = 0; i < N; i++) {
                for (int j = 0; j < NRHS; j++) {
                    B[N * j + i] = Math.random();
                }
            }

            double temp = System.nanoTime();
            int info = Dplasma.plasma_DPOSV(Dplasma.PlasmaUpper, N, NRHS, A, 0, LDA, B, 0, LDB);
            temp = System.nanoTime() - temp;
            //            System.out.println(temp / 1000000.0);
            if (k >= 2) {
                avtime += temp;
            }
            if (info != 0) {
                System.err.println("failure with error " + info);
            }
        }
        System.out.println("Average execution time of JPlasma DPOSV (" + N + "x" + N + ", " + NRHS + " right-hand sides, "
                + NTHREADS + " threads): " + avtime / NITERS / 1000000.0 + " milliseconds");
        Dplasma.plasma_Finalize();

    }
    
    private static void dposvBenchmarkJLAPACK(int N, int NRHS, int NITERS) {
        int LDA = N;
        int LDB = N;
        double[] A = new double[N * N];
        double[] B = new double[N * NRHS];
        double avtime = 0;

        for (int k = 0; k < NITERS + 2; k++) { //the first two iterations are just for warm-up

            for (int i = 0; i < N; i++) {
                for (int j = 0; j < N; j++) {
                    A[LDA * j + i] = 0.5 - Math.random();
                }
            }

            for (int i = 0; i < N; i++) {
                A[LDA * i + i] = A[LDA * i + i] + N;
            }

            for (int i = 0; i < N; i++) {
                for (int j = 0; j < N; j++) {
                    A[LDA * j + i] = A[LDA * i + j];
                }
            }

            for (int i = 0; i < N; i++) {
                for (int j = 0; j < NRHS; j++) {
                    B[N * j + i] = Math.random();
                }
            }

            intW info = new intW(0);
            double temp = System.nanoTime();
            org.netlib.lapack.Dposv.dposv("U", N, NRHS, A, 0, LDA, B, 0, LDB, info);
            temp = System.nanoTime() - temp;
            //            System.out.println(temp / 1000000.0);
            if (k >= 2) {
                avtime += temp;
            }
            if (info.val != 0) {
                System.err.println("failure with error " + info);
            }
        }
        System.out.println("Average execution time of JLAPACK DPOSV (" + N + "x" + N + ", " + NRHS + " right-hand sides): " + avtime / NITERS / 1000000.0 + " milliseconds");

    }

    public static void main(String[] args) {
        if (args.length != 4) {
            System.out.println("Usage: java edu.emory.mathcs.jplasma.benchmark.DposvBenchmark N NRHS NITERS NTHREADS");
            System.exit(1);
        }
        int N = Integer.parseInt(args[0]);
        int NRHS = Integer.parseInt(args[1]);
        int NITERS = Integer.parseInt(args[2]);
        int NTHREADS = Integer.parseInt(args[3]);
        dposvBenchmarkJPlasma(N, NRHS, NITERS, NTHREADS);
//        dposvBenchmarkJLAPACK(N, NRHS, NITERS);        
        System.exit(0);
    }

}