[FFmpeg-devel] [PATCH] IFF: Change decodeplane8 while to do ... while for getting 1% speedup

Måns Rullgård mans
Mon May 10 01:07:47 CEST 2010

Sebastian Vater <cdgs.basty at googlemail.com> writes:

> M?ns Rullg?rd a ?crit :
>> Sebastian Vater <cdgs.basty at googlemail.com> writes:
>>> Benchmarking it resulted in a 1% speedup using MRLake.iff.
>> Just a note on benchmarking.  Any perceived speedup of less than 5% or
>> so must be carefully checked by statistical methods.  Run-to-run
>> variance is often of that magnitude, especially if there is anything
>> else running on the system.
> Since it's averaged for each call (which is around 4096 times for
> MRLake.iff), that issue shouldn't be a problem here.
> After all I get differences +/- 10 dezicycles each run...I think it's
> accurate enough.

That's not how statistics works.

M?ns Rullg?rd
mans at mansr.com

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