[FFmpeg-devel] [PATCH 2/5] fate: avoid framemd5, use framecrc its faster

[Michael Niedermayer]

On Fri, May 17, 2013 at 10:55:27AM +0200, Nicolas George wrote:
> L'octidi 28 floréal, an CCXXI, Michael Niedermayer a écrit :
> > in that case comparing plain C of both against each other would be
> > interresting too
> > if openssl is faster in plain C too then we should consider completely
> > replacing our code by it otherwise it would be better to keep our C
> > code with openssls asm or something like that
> 
> I built openssl with:
> 
> ./Configure no-asm linux-x86_64 shared --prefix=/tmp/ossl
> 
> and compared. Here are the result of the benchmark, doctored to have both
> OpenSSL asm and OpenSSL no-asm together:
> 
> lavu          MD5      size:  1048576  runs:     1024  time:    8.212 +- 0.121
> openssl-noasm MD5      size:  1048576  runs:     1024  time:    5.424 +- 0.353
> openssl-asm   MD5      size:  1048576  runs:     1024  time:    5.085 +- 0.320
> 
> lavu          SHA-1    size:  1048576  runs:     1024  time:    7.034 +- 0.227
> openssl-noasm SHA-1    size:  1048576  runs:     1024  time:    8.194 +- 0.223
> openssl-asm   SHA-1    size:  1048576  runs:     1024  time:    4.694 +- 0.182
> 
> lavu          SHA-224  size:  1048576  runs:     1024  time:   14.966 +- 0.431
> openssl-noasm SHA-224  size:  1048576  runs:     1024  time:   17.409 +- 0.999
> openssl-asm   SHA-224  size:  1048576  runs:     1024  time:   12.882 +- 0.407
> 
> lavu          SHA-256  size:  1048576  runs:     1024  time:   15.018 +- 0.866
> openssl-noasm SHA-256  size:  1048576  runs:     1024  time:   17.391 +- 1.019
> openssl-asm   SHA-256  size:  1048576  runs:     1024  time:   12.921 +- 0.821
> 
> Clearly, their C MD5 is faster and there are tricks that may be borrowed.
> 
> OTOH, their C SHA are worse than lavu's, but there would be benefit in
> importing / reimplementing an assembly version.

ok and agree

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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