Date: Wed, 29 Jun 2011 21:44:49 +0400 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: Parallel cracking On Tue, Jun 28, 2011 at 06:37:08PM -0600, RB wrote: > On 2011-06-28, Rich Rumble <richrumble@...il.com> wrote: > > 0:08:00:00 - Switching to length 8 > > 0:08:00:00 - Expanding tables for length 8 to character count 26 > > 0:08:00:00 - Trying length 8, fixed @1, character count 26 > > > > Have the next thread start at > > > > 0:12:00:00 - Switching to length 8 > > 0:12:00:00 - Expanding tables for length 8 to character count 28 > > 0:12:00:00 - Trying length 8, fixed @5, character count 28 > > and so on... > > That is precisely what the MPI patch does Not precisely. With the MPI patch, different nodes get adjacent "cracking order" entries - see the comment on order in charset.h. Each node can continue running until it hits the end of the order array (which never happens with typical settings, except for all-digit runs and the like), skipping over other nodes' entries. In the example above, we'd have a problem after 4 hours, but with the MPI patch we would not. Alexander
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