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Old 2018-08-22, 01:29   #4
P90 years forever!
Prime95's Avatar
Aug 2002
Yeehaw, FL

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There is no hard-and-fast rule for determining which clm is best for each FFT size. Clm is always 1, 2, or 4. I think that smaller FFT size usually use a clm of 2 or 4 (pass 1 easily fits in the L2 cache) whereas larger FFT sizes usually use a clm of 1 or 2.

Sorry to be so vague.
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