Date: Sun, 20 Nov 2011 08:13:19 +0400 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: OpenMP not using all threads On Sat, Nov 19, 2011 at 10:38:30PM -0500, Stephen Reese wrote: > Thanks for the quick response. There are 42 hashes and 42 unique salts > (13/node). I am going to change this so there are 42 hashes per node > and specify the length, (1-6, 7, 8 for All.chr). > > OpenMP has consistently been around 5000K but I tested another > recommendation of yours for running non-OpenMP due to the previously > discussed system load woes (GOMP_SPINCOUNT did not help). Four > non-OpenMP run at 2000K and a fifth at ~1000K using the same john.pots > and password file via multiple sessions--they seem to even out after a > bit but a combined 9000K is great! This is what I was looking for. It is unclear how you distribute the workload among these 5 processes. And why 5? If you have 8 logical CPUs, then you need 8 processes to use the machine optimally. You'd have 6 of them run on 5 hashes each, and 2 on 6 hashes each. As passwords will be getting cracked, the numbers of hashes per process will be non-equal anyway, so that's sort of OK. Alexander
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