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Originally committed as revision 11597 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2008-01-22 18:21:12 +00:00
parent 5e123bd359
commit ac59e7f4b1
1 changed files with 11 additions and 10 deletions
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21
doc/optimization.txt
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@ -28,16 +28,17 @@ NOTE: If you still don't understand some function, ask at our mailing list!!!
(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.
When is an optimization justified?
----------------------------------
Normally, clean & simple optimizations on widely used codecs can achieve
an overall speedup of 0.1%. These speedups accumulate and can make a big
difference after awhile. Also, if none of the following factors get
worse due to an optimization -- speed, binary code size, source size,
source readability -- and at least one factor improves, then an
optimization is always a good idea even if the overall gain is less than
0.1%. For obscure codecs that are not often used, the goal is more
toward keeping the code clean, small, and readable than to make it 1%
faster.
WTF is that function good for ....: