initializeVkFFT only once? about vkfft HOT 3 OPEN

Hello,

Thanks for your interest in VkFFT! Of course, for the same size of system you don't need to initialize the application again. There is a VkFFTLaunchParams struct that is consumed by VkFFTAppend call which can be used to specify different data and offsets.

Best regards,
Dmitrii

from vkfft.

Thank you, Dmitrii.
Base on your guidance, I wrote the right code for the same size of data.
But, to learn more, does that means for diffierent size of inputs, I have to initialize the application again and again?
Best wishes

from vkfft.

Yes, different sizes require different codepaths, mainly based on the prime decomposition of the number. There is an option to save the binaries after compilation that works in all backends but Metal, as Metal seems to have its own caching mechanism implemented in it, so secondary initializations should be faster.

from vkfft.