It is a pain with FFTW since they expose all this in the API, let you save/load the details etc. A better example is MongoDB. When you make a query they try m

It is a pain with FFTW since they expose all this in the API, let you save/load the details etc. A better example is MongoDB. When you make a query they try multiple query plans concurrently, note which is fastest and use that in the future with continued performance monitoring. Once diverging from expectations they run the contest again. Compare with other databases that put an inordinate amount of effort and tuning into coming up with the one true query plan per query.