DKS/test/testStockFFT3D.cpp

#include <iostream>
#include <cstdlib>
#include <complex>

#include "Utility/TimeStamp.h"
#include "DKSBase.h"

using namespace std;

void printData3DN4(complex<double>* &data, int N, int dim);
void compareData(complex<double>* &data1, complex<double>* &data2, int N, int dim);

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

	int n = 2;
	if (argc == 2) 
		n = atoi(argv[1]);

	int N = pow(2,n);

	cout << "Begin DKS Base tests" << endl;
		
	cout << "FFT size: " << N << endl;

	int dimsize[3] = {N, N, N};

	
	complex<double> *cdata = new complex<double>[N*N*N];
	complex<double> *cfft = new complex<double>[N*N*N];
	complex<double> *cfft2 = new complex<double>[N*N*N];
	complex<double> *cfft3 = new complex<double>[N*N*N];

	
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < N; j++) {
			for (int k = 0; k < N; k++) {
				//cdata[i*N*N + j*N + k] = complex<double>((double)k/(N*N*N), 0);
				cdata[i*N*N + j*N + k] = complex<double>(k, 0);
				cfft[i*N*N + j*N + k] = complex<double>(0, 0);
				cfft2[i*N*N + j*N + k] = complex<double>(0, 0);
				cfft3[i*N + j*N + k] = complex<double>(0, 0);
			}
		}
	}
	
	if (N == 4)
		printData3DN4(cdata, N, 3);
	
	/* init DKSBase */
	cout << "Init device and set function" << endl;
	int ierr;
	
	
	timestamp_t t0, t1;
	
	/* stockham radix-2 out-of-place fft */
	DKSBase base2;
	base2.setAPI("OpenCL", 6);
	base2.setDevice("-gpu", 4);
	base2.initDevice();
	
	cout << endl;
	void *src_ptr;
	for (int i = 0; i < 5; i++) {
		t0 = get_timestamp();
		src_ptr = base2.allocateMemory< complex<double> >(N*N*N, ierr);
		base2.writeData< complex<double> >(src_ptr, cdata, N*N*N);
		base2.callFFTStockham(src_ptr, 3, dimsize);
		base2.readData< complex<double> >(src_ptr, cfft2, N*N*N);
		base2.freeMemory< complex<double> >(src_ptr, N*N*N);
		t1 = get_timestamp();
		cout << "out-of-place FFT time: " << get_secs(t0, t1) << endl;
	}

	if (N == 4)
		printData3DN4(cfft2, N, 3);
	
	//delete base2;
	cout << endl;
	
	/* CUDA cufft */
	DKSBase base3;
	base3.setAPI("Cuda", 4);
	base3.setDevice("-gpu", 4);
	base3.initDevice();
	
	cout << endl;
	void *cuda_ptr;
	for (int i = 0; i < 5; i++) {
		t0 = get_timestamp();
		cuda_ptr = base3.allocateMemory< complex<double> >(N*N*N, ierr);
		base3.writeData< complex<double> >(cuda_ptr, cdata, N*N*N);
		base3.callFFT(cuda_ptr, 3, dimsize);
		base3.readData< complex<double> >(cuda_ptr, cfft3, N*N*N);
		base3.freeMemory< complex<double> >(cuda_ptr, N*N*N);
		t1 = get_timestamp();
		cout << "Cuda FFT time: " << get_secs(t0, t1) << endl;
	}
		
	if (N == 4)
		printData3DN4(cfft3, N, 3);
	
	//delete base3;
	cout << endl;
	
	
	/* radix-2 in place fft */
	DKSBase base;
	base.setAPI("OpenCL", 6);
	base.setDevice("-gpu", 4);
	base.initDevice();
	
	cout << endl;
	void *mem_ptr;
	for (int i = 0; i < 5; i++) {
		t0 = get_timestamp();
		mem_ptr = base.allocateMemory< complex<double> >(N*N*N, ierr);
		base.writeData< complex<double> >(mem_ptr, cdata, N*N*N);
		base.callFFT(mem_ptr, 3, dimsize);
		base.readData< complex<double> >(mem_ptr, cfft, N*N*N);
		base.freeMemory< complex<double> >(mem_ptr, N*N*N);
		t1 = get_timestamp();
		cout << "in-place FFT time: " << get_secs(t0, t1) << endl;
	}
	
	if (N == 4)	
		printData3DN4(cfft, N, 3);
	
	//delete base;
	cout << endl;
	
	/* compare results */	
	cout << endl;
	
	cout << "Radix 2 vs Stockham: ";
	compareData(cfft, cfft2, N, 3);
	
	cout << "Radix 2 vs Cufft: ";
	compareData(cfft, cfft3, N, 3);
	
	cout << "Stockham vs Cufft: ";
	compareData(cfft2, cfft3, N, 3);	

	return 0;
}

void printData3DN4(complex<double>* &data, int N, int dim) {
    
	for (int j = 0; j < N; j++) {
		for (int i = 0; i < N; i++) {
			for (int k = 0; k < N; k++) {
				double d = data[i*N*N + j*N + k].real();
				if (d > 10e-5 || d < -10e-5)
				    cout << d << "\t";
				else 
					cout << 0 << "\t";
    		}
    	}
	    cout << endl;
	}
	cout << endl;
    
}

void compareData(complex<double>* &data1, complex<double>* &data2, int N, int dim) {
    int ni, nj, nk, id;
    ni = (dim > 2) ? N : 1;
    nj = (dim > 1) ? N : 1;
    nk = N;
    double sum = 0;
    for (int i = 0; i < ni; i++) {
		for (int j = 0; j < nj; j++) {
	    	for (int k = 0; k < nk; k++) {
			id = i*ni*ni + j*nj + k;
			sum += fabs(data1[id].real() - data2[id].real());
			sum += fabs(data1[id].imag() - data2[id].imag());
		    }
		}
    }
    cout << "CC <--> CC diff: " << sum << endl;
}