public class Benchmark {

static int LOG2FFTSIZE = 12;

static int FFT_REPEAT = 1000;

public static void main(String[] args){

int i;

//double eltime;

int SIZE = 1<<LOG2FFTSIZE;

double[][] xy = new double[SIZE][2];

double[][] xy_out_fft = new double[SIZE][2];

for(i=0; i<SIZE/2; i++) { xy[i][0]= 1.; xy[i][1]= 0.; }

for( ; i<SIZE ; i++) { xy[i][0]= -1.; xy[i][1]= 0.; }

// warm up ... JIT activating

Fft fftc = new Fft();

for (i=0; i<FFT_REPEAT; i++) fftc.fft(LOG2FFTSIZE, xy_out_fft, xy);

// FFT & time measurement

long starttime = System.nanoTime();

for (i=0; i<FFT_REPEAT; i++) fftc.fft(LOG2FFTSIZE, xy_out_fft, xy);

double eltime = (System.nanoTime() - starttime)/1000000.;

System.out.format("%6d piece(s) of %d pt FFT; %9.5f ms/piece\n", FFT_REPEAT, 1<<LOG2FFTSIZE, eltime/FFT_REPEAT);

for(i=0; i<6; i++) {

System.out.format("%d\t%f\t%f\n", i, xy_out_fft[i][0], xy_out_fft[i][1]);

}

}

}