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Date: Thu, 1 Jun 2006 05:24:37 -0500
From: "Randy B" <>
Subject: Re: beta MPI john patch against 1.7.2.

Any particular MPI implementation you either espouse or recommend
avoiding?  I personally have been using lam-mpi, but that was more of
a random dart-board kind of selection than anything.


On 5/31/06, Otheus (aka Timothy J. Shelling) <> wrote:
> This is a (beta) patch for John 1.7.2 for use with MPI.  All of the
> MPI-specific code is encapsulated by #ifdef MPI/#endif, so in theory this
> can be integrated into the main code branch. However, a few generic changes
> to the code are also made.
> Please let me know of any rejects while performing the patch. (Use -l to
> ignore whitespace to avoid problems with bench.c.)
> Changes:
>   o  internalized computing the checksum for ext_word. 15% increase in speed
> (at least)
>   o  makes sure options required for MPI are present
>   o  computes MPI performance in --test mode.
> Notes:
>   o  benchmark computes results by summing cracks across all nodes and
> dividing that by the AVERAGE of the crack-times. (in the code, cracks are
> multiplied by the MPI-size, which is the same thing).
> Known bugs:
>   o   john.pot gets littered with extraneous output, usually low integers
> like "4" or "1" and a newline. Very strange. Still trying to track it down.
>   o   successfull cracks do not get posted to the other tasks
>   o   use of external filter with internal checksum causes a slight (1-2%)
> slowdown
> Incorporate the john.conf file into yours (or the default)... then run with:
>  mpirun <mpirun-args> john <mode> --external=MPIbyInternalKeySum
> --session=john%d.rec
> For a restore:
>  mpirun <mpirun-args> john --restore=john%d.rec
> You can also benchmark it:
> mpirun <mpirun-args> john --test
> --
> Otheus
> +43.650.790.2571
> --
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