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FFTW / fftw3

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Documentation of flag FFTW_ESTIMATE_PATIENT #223

Closed dfarns closed 3 years ago

dfarns commented 3 years ago

I see this in the source as one of the "undocumented guru" flags, but can you please provide a description? Would this somehow guarantee a recurring plan for the same problem, as with FFTW_ESTIMATE, but choose a "better" plan and improve execute performance? Thanks!

stevengj commented 3 years ago

It is just an experiment with estimated costs but applied to a larger space of plans. It probably produces slower plans in practice — there's certainly no guarantee that it is better, since it is still limited by the fact that it is not performing any timing measurements.

dfarns commented 3 years ago

Thank you for the explanation.