Thread: DWT
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Old 2004-08-03, 08:29   #41
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Feb 2003

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Originally Posted by justinsane
On my NON-SSE2 box, the new LLR was much slower. I notice that it tends to select the largest FFT (for N around 700,000) so it took twice the time that the old LLR would have for that number.
You are testing k=121, right? And around n=700,000 (or may be n=730,000) I would expect a lot of fftlen switching with the old LLR, isn't it?
The new formula for choosing the FFT length works well for k<32 but tends to overestimate at larger values of k. There is still no "optimal" formulation for guessing the FFT length right. If on your k the new non-SSE2 LLR is slower than the old one, then I suggest the use the old LLR.

-- Thomas
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