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Date: Wed, 13 Feb 2013 09:30:18 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Do you have this hardware and a few minutes?

On 13 Feb, 2013, at 5:28 , Sayantan Datta <std2048@...il.com> wrote:
> On Wed, Feb 13, 2013 at 3:40 AM, magnum <john.magnum@...hmail.com> wrote:
> On 9 Feb, 2013, at 5:51 , Sayantan Datta <std2048@...il.com> wrote:
>> I've my 4890 lying around but I'm unable to use it alongside 7970. Even though I have configured my driver to detect both the cards , but AMD OpenCL won't recognize them simultaneously.  I posted this issue on amd forums but I didn't get a complete solution.
>> http://devgurus.amd.com/message/1284901#1284901   
> 
> I helped someone set up a machine with two cards for GPGPU, running Linux. There was no chance of getting the second GPU to work (the one without a physical monitor attached) until we made a loopback plug, fooling it into thinking there is a monitor. Maybe this has something to do with it?
> 
> http://www.overclock.net/t/384733/the-30-second-dummy-plug
> 
> After that, it was just "aticonfig --adapter=all --initial" and everything worked fine.
> 
> magnum
> 
> That is really cool hack. I did "aticonfig --adapter=all --initial" and my driver detects both the card ,but opencl won't. Clinfo only shows the 7970 and cpu.

The sympthoms we had before using the loopback VGA plug was that both cards showed up when listing devices and you could address both of them, but in the end only one was used. So one card ran overbooked and the other was just idling. After lots of farting around we noticed that clinfo showed the same PCI bus ID for both cards. After installing the loop adapter it showed different PCI ids.

After this, I added PCI id to our --list=opencl-devices output but it uses proprietry calls so only works with AMD. For nvidia you can use --list=cuda-devices.

magnum


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