[FFmpeg-devel] Proposed patch

Michael Niedermayer michaelni
Sat Aug 4 14:12:14 CEST 2007


On Sat, Aug 04, 2007 at 09:31:35AM +0000, Arpi wrote:
> Hi,
> > >   Anyway, if you consider ppc to be a critical one to benchmark on,
> > > I would need somebody to do it for me.  
> > 
> > well, if noone steps forward to benchmark it on ppc then ill assume that
> > there are no ppc users who care about a possible 50% speedloss 
> > (or speedgain...)
> Darwin g5.local 8.10.0 Darwin Kernel Version 8.10.0: Wed May 23 16:50:59 PDT
> 2007; root:xnu-792.21.3~1/RELEASE_PPC Power Macintosh powerpc
> 2x2.5ghz G5 cpu...
> gcc version 4.0.1 (Apple Computer, Inc. build 5341)
> MPlayer SVN-r24007 (C) 2000-2007 MPlayer Team
> -vc ffmpeg12:
> BENCHMARKs: VC:   3.138s VO:  13.480s A:   0.000s Sys:   0.487s =   17.104s
> BENCHMARK%: VC: 18.3444% VO: 78.8109% A:  0.0000% Sys:  2.8447% = 100.0000%
> SVN-r24007 + the patch:
> BENCHMARKs: VC:   3.189s VO:  13.302s A:   0.000s Sys:   0.499s =   16.990s
> BENCHMARK%: VC: 18.7674% VO: 78.2959% A:  0.0000% Sys:  2.9367% = 100.0000%
> little slowdown...

depends on which number you look at, VC yes, overall no, which is odd as the
other parts shouldnt be affected by the patch ...
maybe you could run these two benchmarks 3 times?

also maybe you want to test the libmpeg2 bitstream reader, i think it hasnt
been tested on ppc yet (or i dont remember ...)
on x86 (duron 1x0.8 ghz, gcc 4.1.2)
with the good old matrixbench mpeg2 its slower:

real	0m54.348s
user	0m52.692s
sys	0m1.349s
real	0m54.193s
user	0m52.755s
sys	0m1.239s
real	0m54.249s
user	0m52.769s
sys	0m1.209

#define LIBMPEG2_BITSTREAM_READER in bitstream.h (!this needs svn head due to
bugs in mpeg12.c)
real	0m55.479s
user	0m53.548s
sys	0m1.332s
real	0m55.097s
user	0m53.601s
sys	0m1.271s
real	0m55.542s
user	0m53.628s
sys	0m1.232s

#define A32_BITSTREAM_READER in bitstream.h
real	0m57.933s
user	0m56.142s
sys	0m1.261s
real	0m58.778s
user	0m56.474s
sys	0m1.455s

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When the tyrant has disposed of foreign enemies by conquest or treaty, and
there is nothing more to fear from them, then he is always stirring up
some war or other, in order that the people may require a leader. -- Plato
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