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Date: Thu, 6 Jun 2013 16:49:40 +0200
From: Marc Brinkmann <marc.brinkmann@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: Adding more "Nodes" to MPI Session
Thanks magnum, for your fast answer.
Could you please tell me the syntax for OpenMP?
I'd like to run a OMP benchmark.
If it's fast enough, I'll restart the session.
Thank you very much.
PS: if the CPU also supports opencl, couldn't i use it?
Thank you very much =)
2013/6/6 magnum <john.magnum@...hmail.com>
> On 6 Jun, 2013, at 15:32 , Marc Brinkmann <marc.brinkmann@...il.com>
> wrote:
> > i just stopped my john-session that was running for about 130 days on MPI
> > (4 cores) to breack an office2010 password.
> >
> > i upgraded the VM from 4 to 6 vCPUs
> > is there a way to restore my session using all 6 cores?
> > because now there is no john.4.rec and no john.5.rec :(
> > And it would be sad, to start from scratch.
>
> In general, no. You should have used OMP instead of MPI. It would do more
> or less the same speed (in this case) but with OMP you can change number of
> threads when restoring jobs.
>
> There is a way to resume MPI and *double* the number of cores though,
> using OMP together with MPI: If you go eg. from 4 to 8 CPUs, you can resume
> the old job after setting "MPIOMPmutex = N" in john.conf and start the job
> like this:
>
> mpirun -x OMP_NUM_THREADS=2 -np 4 ./john -resume:name
>
> magnum
>
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