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 > http://www.openwall.com - bringing security into open computing > environments > > -- > To unsubscribe, e-mail john-users-unsubscribe@...ts.openwall.com > and reply > to the automated confirmation request that will be sent to you. -- To unsubscribe, e-mail john-users-unsubscribe@...ts.openwall.com and reply to the automated confirmation request that will be sent to you.
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