john-users - Re: MacOSX Jumbo 9 and OpenMP DES Custom Binary

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Message-ID: <20101215202816.GA1431@openwall.com>
Date: Wed, 15 Dec 2010 23:28:16 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: MacOSX Jumbo 9 and OpenMP DES Custom Binary

Erik, all -

On Mon, Dec 13, 2010 at 06:56:47AM -0500, Erik Winkler wrote:
> I created an updated version of the MacOS X binary using jumbo 9 and the omp des 7 patches and put it up on the wiki at http://openwall.info/wiki/john/custom-builds.

Thanks!  I added this to the usual places:

http://www.openwall.com/john/#contrib
http://download.openwall.net/pub/projects/john/contrib/macosx/

> I used gcc 4.6.0 this time ...

Actually, gcc 4.6.0 has not been released yet, and the release will
differ from current development snapshots, including in OpenMP specific
aspects.  One relevant change went in just recently:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43706

"Default to spin count 300000 instead of 20000000 if neither
OMP_WAIT_POLICY nor GOMP_SPINCOUNT is specified."

> and there is improved performance with DES

That's nice.

> and a little bit with LM hashes

For LM hashes, it is typically possible to obtain better performance by
using the "faster bitslice DES key setup" patch alone (no OpenMP).  This
is john-1.7.6-fast-des-key-setup-3.diff.gz available here:

http://openwall.info/wiki/john/patches

I understand that this might be unsuitable for a generic binary build
where you want OpenMP to be available for other hash types.

Thanks again,

Alexander

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