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Date: Sat, 13 Mar 2010 17:23:27 +0100
From: "Magnum, P.I." <rawsmooth@...dband.net>
To: john-users@...ts.openwall.com
Subject: Re: Is JTR MPIrun can be optimized for more cores ?
I wrote:
> I just found something odd though. Can anyone explain this?
...
> The speed to /dev/null is bad, the one to file is awful.
Got it. Tried gprof but it didn't show much difference to non-mpi. So I
tested recompiling with OpenMPI instead of MPICH2 and that put the
figures back to more like normal. There still is a significant
performance hit though, despite we're not actually doing any MPI stuff
in this case. I'm glad I don't see this kind of performance hit when
cracking.
john-1.7.5-jumbo2:
------------------
$ ./john -stdout -w=sd.lst -ru=s >file1
words: 62570773 time: 0:00:00:12 100.00% w/s: 5171K current: snip
$ ./john -stdout -w=sd.lst -ru=s >/dev/null
words: 62570773 time: 0:00:00:10 100.00% w/s: 5804K current: snip
john-1.7.5-jumbo2-fullmpi-3 using MPICH2
----------------------------------------
$ ./john -stdout -w=sd.lst -ru=s >file2
words: 62570773 time: 0:00:03:45 100.00% w/s: 277021 current: snip
^^^^ ^^^^^^
$ ./john -stdout -w=sd.lst -ru=s >/dev/null
words: 62570773 time: 0:00:00:29 100.00% w/s: 2124K current: snip
john-1.7.5-jumbo2-fullmpi-3 using OpenMPI
-----------------------------------------
$ ./john -stdout -w=sd.lst -ru=s >file2
words: 62570773 time: 0:00:00:13 100.00% w/s: 4693K current: snip
$ ./john -stdout -w=sd.lst -ru=s >/dev/null
words: 62570773 time: 0:00:00:11 100.00% w/s: 5266K current: snip
I didn't change one single line of code, just recompiled it with openmpi
libs.
magnum
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