[astro] Problems with multiple ATI GPUs in Linux, MilkyWay at Home

[Matt Arsenault]

On Mar 7, 2012, at 12:22 PM, Ryan Wolf wrote:

> Matt:
> 
> Yea, that breaks it, and then no GPUs work once that cc_config.xml is made.

Actually the option section shouldn't be there
<cc_config>
  <use_all_gpus>1</use_all_gpus>
</cc_config>


> 
> Further, in Linux, it seems it requires each GPU to have a monitor
> attached, which seems ridiculous.
That sounds right. It has been definitely true in the past but I'm not really sure what the current state is. You definitely need X running. Also on AMD you can't have Xinerama enabled or more than the first GPU also won't show up.

> We're doing GPU computing just fine in OpenCL without any trickery like this, so maybe what we develop here at
> our R&D office can be integrated into BOINC/MilkyWay at Home.
There's nothing involving Milkyway or BOINC there. The driver situation is moderately terrible everywhere.


> Is there a way I could schedule a time to talk with you, and maybe SWCS
> can help sponsor RPI's MilkyWay at Home project? I've been meaning to get
> in touch about the IBM Blue Gene/L system there anyhow.
I'm not the person to talk to about that stuff