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Date: Tue, 07 Jan 2014 18:18:23 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: CUDA multi-device support
On 2014-01-07 16:51, Muhammad Junaid Muzammil wrote:
> Currently, I don't have physical multi GPU access. Will have to look for
> some alternatives.
Otherwise I can get temporary access to a dual-device CUDA machine in a
week or so, so I can do the pwsafe fixes. Feel free to pick any other
issue you want from https://github.com/magnumripper/JohnTheRipper/issues
(just tell us you'll be looking into it so we don't end up doing same
things) or just implement a new format of your choice (perhaps one we
have as CPU-only), or optimize an existing one if possible. CUDA or
OpenCL, that's up to you.
BTW another thing you could try if you like, is CUDA auto-tuning. Many
of our OpenCL formats auto-tune their local/global worksizes at startup
(and we're moving towards using as much shared code as possible for
that). All our CUDA formats currently have hard-coded threads/blocks,
defaulting to figures non-optimal for high-end GPUs.
magnum
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