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Date: Tue, 29 Jun 2010 22:12:15 -0500
From: "Joshua J. Drake" <jtr-users@...p.org>
To: john-users@...ts.openwall.com
Subject: Re: bitslice DES parallelization with OpenMP
Solar,
There seems to be a huge slow down when I try with a few cores under
high load.. I was actually getting worse performance than running a
single instance by itself.
Specs - Dual quad core XEON 2.5ghz (E5420)
No load:
fear:0:john-1.7.6$ ./run/john -test --format=des
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 16741K c/s real, 2093K c/s virtual
Only one salt: 4993K c/s real, 624074 c/s virtual
High load on one core:
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 40960 c/s real, 5856 c/s virtual
Only one salt: 61440 c/s real, 8781 c/s virtual
Two cores:
Benchmarking: Traditional DES [128/128 BS SSE2-16]... DONE
Many salts: 40960 c/s real, 6832 c/s virtual
Only one salt: 61440 c/s real, 10246 c/s virtual
My guess is that john is actively trying to use this(these) core(s) even though
it's(they) are already in use.
Hope this helps,
--
Joshua J. Drake
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