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Date: Mon, 4 Jun 2012 20:45:36 +0400
From: Solar Designer <>
Subject: Re: JtR OMP Questions

On Mon, Jun 04, 2012 at 09:48:12PM +0530, SAYANTAN DATTA wrote:
> eg.
> bash$ OMP_NUM_THREAD=3 ./john -te -fo=raw-md5
> it will use only 3 threads.

...except that there's no OpenMP support for raw-md5 currently, so it
will only use 1 thread regardless of OMP_NUM_THREADS.  Oh, and
OMP_NUM_THREAD was a typo (should be OMP_NUM_THREADS).  A better example
would be:

OMP_NUM_THREADS=3 ./john -te=1 -fo=des

Also, GOMP_SPINCOUNT may need to be tuned on a particular system.
I recommend testing these values: 10000, 100000, 300000 (gcc 4.6.0+
default), 3000000, 10000000.  No need to fine-tune it, so testing these
5 values should be enough.


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