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Message-Id: <B1BA2D5B-573D-4E20-A461-08B72102B6ED@erols.com>
Date: Thu, 5 Oct 2006 06:09:39 -0400
From: Erik Winkler <ewinkler@...ls.com>
To: john-users@...ts.openwall.com
Subject: Re: JTR and os X macintel
On Oct 4, 2006, at 9:44 PM, Solar Designer wrote:
>
>> Now, I have compiled the same source with the command :
>> "make macosx-x86-sse2"
>> now test return me :
>>
>> Benchmarking: Traditional DES [128/128 BS SSE2]... DONE
>> Many salts: 1841K c/s real, 1845K c/s virtual
>> Only one salt: 1532K c/s real, 1535K c/s virtual
>
> That's really good performance - it looks like we have a new leader at
> DES-based crypt(3).
It appears this is a 2.16 Ghz core2 duo Intel CPU. Thanks for the
insite websiteaccess.
>
>> My mac has a "core duo", is JTR use 2 cores at the same time ?
>
> No. As discussed on this mailing list oh-so-many times, you need to
> start two instances of JtR manually in order to have it use both CPU
> cores. For "incremental" mode, a reasonable way to split the task
> across two cores is to set one instance to try lengths 0 through 7 and
> the other to length 8. The following FAQ entry is relevant:
>
> Q: Does John support multi-processing or distributed processing?
> A: There's no real MP or distributed processing support in John right
> now, but you can distribute the work between a few nodes manually.
> One
> approach would be to have your nodes (CPUs, machines) each try
> different
> password lengths. This is easily accomplished with "incremental"
> mode's
> "MinLen" and "MaxLen" settings (see CONFIG). Typically, you would not
> really need to split the work for "single crack" and wordlist modes
> since these are relatively quick, although you may dedicate one
> node to
> those initially. You may safely run multiple instances of John in the
> same working directory, all writing to the same "pot file" (this is a
> feature). You do, however, need to assign each of them a unique
> session
> name, with "--session". Other approaches, such as splitting password
> files naively (without regard to salts), are typically less efficient
> (in some cases to the extent where there's no speedup from using
> multiple processors at all).
Actually from a CPU usage screen shot I received from websiteaccess,
MacOSX seems to have about 80% of one core and 50% of the 2nd core in
use while running John. The MacOSX equivalent of "top" shows 99%
usage by john the ripper alone at the same time. MacOSX may be
distributing the load across both processors or even SSE2 units, but
I am not certain. It could explain the high benchmarks though.
An interesting test would be benchmarks on a new dual xeon Mac Pro.
Any graphics designers out there with these new machines?
Erik
>
> --
> Alexander Peslyak <solar at openwall.com>
> GPG key ID: 5B341F15 fp: B3FB 63F4 D7A3 BCCC 6F6E FC55 A2FC 027C
> 5B34 1F15
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> environments
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