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Re: digest algorithm performance

From: P
Subject: Re: digest algorithm performance
Date: Wed, 15 Jun 2005 17:00:26 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040124

Jim Meyering wrote:
address@hidden wrote:

I haven't looked too deeply into this,
so this is just a heads up.

Yep.  I mentioned that coreutils/TODO wrt md5sum:

  Look into improving the performance of md5sum.
  `openssl md5' is consistently about 30% faster than md5sum on an idle
  AMD 2000-XP system with plenty of RAM and a 261 MB input file.
  openssl's md5 implementation is in assembly, generated by a perl script.

I suspect their sha1 code is similar.
I'd welcome patches to improve the performance of either.

OK, I'll have a look. FreeBSD seems to be faster again,
(don't compare these results to the previous mail):

$time sha1 < 15MBfile

real    0m0.128s
user    0m0.126s
sys     0m0.001s

$time openssl sha1 < 15MBfile

real    0m0.234s
user    0m0.174s
sys     0m0.048s

Pádraig Brady - http://www.pixelbeat.org

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