Performing Fourier Transform with Thrust

cuda, fft, thrust

Solution

This is a very late answer, just to remove this question from the unanswered list.

Using cuFFT with thrust should be very simple and the only thing to do should be to cast the `thrust::device_vector` to a raw pointer. A very simple example is reported below:

#include <iostream>
#include <cufft.h>
#include <stdlib.h>
#include <thrust/host_vector.h>
#include <thrust/device_vector.h>
#include <thrust/generate.h>
#include <thrust/transform.h>

int main(void){

    int N=4;

    // --- Setting up input device vector    
    thrust::device_vector<cuFloatComplex> d_in(N,make_cuComplex(1.f,2.f)), d_out(N);

    cufftHandle plan;
    cufftPlan1d(&plan, N, CUFFT_C2C, 1);

    cufftExecC2C(plan, thrust::raw_pointer_cast(d_in.data()), thrust::raw_pointer_cast(d_out.data()), CUFFT_FORWARD);

    // --- Setting up output host vector    
    thrust::host_vector<cuFloatComplex> h_out(d_out);

    for (int i=0; i<N; i++) printf("Element #%i; Real part = %f; Imaginary part: %f\n",i,h_out[i].x,h_out[i].y);

    getchar();
}

Problem

Original source