Date: Thu, 28 Mar 2013 13:05:06 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: MPI-openCL build; fast hashes are faster!! On Thu, Mar 28, 2013 at 03:24:57AM +0530, Sayantan Datta wrote: > OpenCL-MPI build using openmpi results in some of the fast hashes to speed > up by 1.5-3x without any extra modification e.g. raw-md4,raw-md5,raw-sha1 The speed at raw-* on GPU is unimportant - they're way too slow until we generate candidate passwords on GPU anyway. Not for actual use yet, even with a 3x speedup, except maybe if one has only a tiny GPU and an even smaller CPU anyway. > ,xsha512 and des. For these, it matters. For des-opencl, I've been testing 4 independent processes (e.g. for different password lengths), which brings the combined speed to around 60M c/s running against one descrypt hash on 7970. This is still far from perfect (the target speed is a few hundred million c/s), but it's a 3x improvement over CPU, so it makes sense for some uses. Alexander
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