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Message-ID: <4255c2570606010324p47465c68jd991df75ca74a492@mail.gmail.com>
Date: Thu, 1 Jun 2006 05:24:37 -0500
From: "Randy B" <aoz.syn@...il.com>
To: john-users@...ts.openwall.com
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.
RB
On 5/31/06, Otheus (aka Timothy J. Shelling) <otheus@...il.com> 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
> otheus@...il.com
> +43.650.790.2571
> --
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>
>
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