FFT sample code produces incorrect Intensity graph

[JohannM]

Please see attached image of the output. The intensity graph does not match the pulsing sine wave icon. The Nvidia system info is displayed alongside to help. Is it due to a change in the way cuFFT was implemented since the creation of the multi-channel sample code? Any help to resolve this dispute would be much appreciated. If more info is needed please let me know.

[Simon153]

Hi,

try CUDA version 4.1. I had the same issue a few months ago, after trying the older version it worked fine. Maybe versions newer than 4.1 work also, but I didn't test it.

[ngene]

Most probably you are using CUDA versio 7.0 or higher. Tehre is an issue with FFT here.

If you downgrade the CUDA to v6.5, it will solve the issue.

[JohannM]

I'll give the solutions a try when I'm back in the office. Do you know what is the cause of this issue and should it be filed somewhere?

[ngene]

You can see that there is a recomended patch for cuFFT from download page:

https://developer.nvidia.com/cuda-toolkit-70

Most probably this will solve the problem, but I've never tried.

[rodrigo.freundt]

I have the same graph when running that cufft example with CUDA 7.5. Someone have found a solution other than get back to 6.5?