Is it possible to call cufft library calls in devi

Question

I use the cuFFT library calls in a host code they work fine, but I want to call the cuFFT library from a kernel. Earlier versions of the CUDA didn't have this kind of support but with the dynamic parallelism is this possible ?

It will be great if there are any examples on how to achieve this.

Answer 1

there is NO way to call the APIs from the GPU kernel. You must call them from the host. If you want to run a FFT without passing from DEVICE -> HOST -> DEVICE to continue your elaboration, the only solution is to write a kernel that performs the FFT in a device function. Actually I'm doing this because I need to run more FFTs in parallel without passing again the datas to the HOST. If you find/have another solution let me know. There are a lot of example on the web to how to achieve this: -https://hackage.haskell.org/package/pure-fft-0.2.0/docs/Numeric-FFT.html

Answer 2

Despite the introduction of dynamic parallelism on Kepler (cc 3.5) cards, cuFFT remains a host API and there is currently no way of creating or executing FFT operations in device code using cuFFT.