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Date: Tue, 07 Jan 2014 18:18:23 +0100
From: magnum <>
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 
(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.


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