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Date: Fri, 1 Aug 2014 17:53:44 +0000
From: Pyrex <>
To: "" <>
Subject: RE: John MPI Questions

I serenely apologize for responding to my own post but another question came to mind.

When utilizing MPI is it possible to run hashes on both the GPU + CPU such as:

sha512crypt + sha512crypt-cuda

This would allow me to utilize the 50 some odd cpu cores I have in the cluster plus the GPUs.

Thanks again!


From: Pyrex
Sent: Friday, August 1, 2014 9:56 AM
Subject: [john-users] John MPI Questions

While utilizing John with an MPI cluster I have run into several things that I have not yet been able to figure out nor is it available in the README.mpi and if it is maybe I am misunderstanding it.

First, is it possible to add additional nodes at any time? If so how?

Second, I understand that I am to send "pkill -USR2 mpirun" in order to force the nodes to sync before killing the session but what would be the proper means to kill the session? Send "pkill -USR2 mpirun" then Ctrl+C John? Should I wait a while before Ctrl+C? I Have had notes continue to run John even after the "pkill -USR2 mpirun" and Ctrl+C so I'd like to know more about the proper method for shutting down.

Third, what is the proper way to kick off a multi cluster CUDA + OpenMP session? I am presently using the following for WPA-PSK "mpirun -hostfile ~/etc/mpi.hosts -x LD_LIBRARY_PATH=/usr/local/cuda-6.0/lib:$LD_LIBRARY_PATH -n 7 ~/bin/john-wpa/john -format=wpapsk-cuda ~/wrk/wpa-hash.wrk" I assume setting the "-n" value should always be equal to the number of nodes I have? Right now I have noticed the following effect, the hashes are processing faster but the CPU time is bouncing around from core to core. When I ran tests on my desktop it seems to use all the cores time more evenly.



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