cuFFT plans: memory and time Should I cache my FFT plans?

The doc doesn’t say much about cuFFT plans in terms of how long they take to create, and how much CPU and GPU memory they take up. I suspect it’s quite a lot (I was leaking them for a while and it didn’t take many before I ran out.) Maybe more than just tables of twiddle factors…

Should I be caching them rather than creating them new each convolution? If I cache them, the memory stays around even if I might not do another convolve for a long time. If I don’t, I pay the price in time to rebuild it.

I’m doing 2d complex<->complex ~2k x 2k transforms mostly, if that makes a difference.

Any guidance from folks here?
– Gary

I keep FFT plane all the time. I think memory usage is not a problem.