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Date: Sun, 14 Mar 2010 19:38:27 +0300
From: Solar Designer <>
Subject: Re: Is JTR MPIrun can be optimized for more cores ?

On Sat, Mar 13, 2010 at 11:23:21AM -0700, RB wrote:
> On Sat, Mar 13, 2010 at 09:23, Magnum, P.I. <> wrote:
> > I didn't change one single line of code, just recompiled it with openmpi
> > libs.
> This is similar to what I was seeing; I developed and tested with
> OpenMPI.  My tests (without the jumbo patches) were simply to run
> 'john --test' for a few key ciphers and showed similarly significant
> hits in c/s rates over 10-15 runs each.

Here's a guess: maybe the gcc optimization flags are somehow lost (not
passed on to gcc) when you build with the MPI compiler wrapper?  Maybe
try running your build under strace and see?


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