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Message-ID: <20150807094531.GA29595@openwall.com>
Date: Fri, 7 Aug 2015 12:45:31 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Benchmark result
On Fri, Aug 07, 2015 at 11:38:00AM +0200, magnum wrote:
> On 2015-08-07 09:36, Solar Designer wrote:
> >On Fri, Aug 07, 2015 at 01:53:14AM +0200, Viktor Gazdag wrote:
> >>./john --fork=8 --device=0,1,2,3,4,5,6,7 --format=Raw-SHA256-opencl
> >
> >This is a total waste of GPUs. Don't do it. For fast hashes (anything
> >starting with raw-*, some others), we generally don't have efficient
> >code on GPUs, with some recent exceptions (Sayantan has implemented mask
> >mode on GPU recently, for a handful of fast hash types, but not for all).
>
> It's not a waste: Claudio implemented GPU-side mask for his raw formats
> long ago!
Oh, I must have missed that. We got to have a list of formats
supporting GPU mask mode somewhere, or/and JtR should print a message
indicating whether or not mask mode is implemented on the OpenCL device
when you invoke any OpenCL format with mask mode. It should also warn
when a fast hash format is invoked without mask mode.
Viktor's command _is_ a waste of GPUs anyway: he didn't use mask mode.
Alexander
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