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"What speedup justifies an optimization" section

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Originally committed as revision 11595 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Michael Niedermayer 2008-01-22 14:45:20 +00:00
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doc/optimization.txt
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@ -23,6 +23,15 @@ and how they can be optimized.
NOTE: If you still don't understand some function, ask at our mailing list!!! NOTE: If you still don't understand some function, ask at our mailing list!!!
(http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel) (http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel)
What speedup justifies an optimizetion?
Normaly with clean&simple optimizations and widely used codecs a overall
speedup of the affected codec of 0.1% is enough. These speedups accumulate
and can make a big difference after a while ...
Also if none of the following gets worse and at least one gets better then an
optimization is always a good idea even if the overall gain is less than 0.1%
(speed, binary code size, source size, source readability)
For obscure codecs noone uses, the goal is more toward keeping the code clean
small and readable than to make it 1% faster.
WTF is that function good for ....: WTF is that function good for ....: