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CUDA and SLI

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pp:
Hmm, I added

--- Code: ---Option "MultiGPU" "1"
--- End code ---
to my xorg.conf to enable SLI on my GTX295 and BOINC immediately aborted 1842 CUDA-jobs because it didn't find any CUDA devices. Wasn't this problem fixed long ago? I'm using 190.36.
/PP

sunu:

--- Quote from: pp on 09 Oct 2009, 05:44:46 pm ---Wasn't this problem fixed long ago? I'm using 190.36.
/PP

--- End quote ---

What problem, boinc's or nvidia's? For boinc I would say it's standard procedure, if it can't find a graphics card, it aborts all GPU-assigned tasks.

As for nvidia, when I first got my GTX295, I experimented with various sli options in xorg.conf. When sli was enabled I strangely had much worse desktop performance than with sli disabled but I still could do cuda tasks in one core of course (back then, with sli enabled you could use only one core for cuda, recent drivers supposedly enable you to run two cuda tasks in GTX295 even with sli enabled). Because of the worse performance I've never bothered with sli since.

pp:
That was my understanding too but in my case Boinc 6.10.13 didn't find ANY cuda-devices when I had SLI enabled... I'll just leave it off for now.

This is what I got in Xorg.0.log... couldn't find any errors there.

--- Code: ---(**) NVIDIA(0): Option "Coolbits" "1"
(**) NVIDIA(0): Option "MultiGPU" "1"
(**) Oct 09 23:25:02 NVIDIA(0): Enabling RENDER acceleration
(**) Oct 09 23:25:02 NVIDIA(0): NVIDIA Multi-GPU auto-select rendering option.
(II) Oct 09 23:25:02 NVIDIA(0): Support for GLX with the Damage and Composite X extensions is
(II) Oct 09 23:25:02 NVIDIA(0):     enabled.
(II) Oct 09 23:25:05 NVIDIA(0): NVIDIA Multi-GPU enabled.
(II) Oct 09 23:25:05 NVIDIA(0): NVIDIA GPU GeForce GTX 295 (GT200) at PCI:5:0:0 (GPU-0)
(--) Oct 09 23:25:05 NVIDIA(0): Memory: 917504 kBytes
(--) Oct 09 23:25:05 NVIDIA(0): VideoBIOS: 62.00.6c.00.01
(II) Oct 09 23:25:05 NVIDIA(0): Detected PCI Express Link width: 16X
(--) Oct 09 23:25:05 NVIDIA(0): Interlaced video modes are supported on this GPU
(--) Oct 09 23:25:05 NVIDIA(0): Connected display device(s) on GeForce GTX 295 at PCI:5:0:0:
(--) Oct 09 23:25:05 NVIDIA(0):     HP LP2465 (DFP-1)
(--) Oct 09 23:25:05 NVIDIA(0): HP LP2465 (DFP-1): 330.0 MHz maximum pixel clock
(--) Oct 09 23:25:05 NVIDIA(0): HP LP2465 (DFP-1): Internal Dual Link TMDS
(II) Oct 09 23:25:05 NVIDIA(0): NVIDIA GPU GeForce GTX 295 (GT200) at PCI:4:0:0 (GPU-1)
(--) Oct 09 23:25:05 NVIDIA(0): Memory: 917504 kBytes
(--) Oct 09 23:25:05 NVIDIA(0): VideoBIOS: 62.00.6c.00.02
(II) Oct 09 23:25:05 NVIDIA(0): Detected PCI Express Link width: 16X
(--) Oct 09 23:25:05 NVIDIA(0): Interlaced video modes are supported on this GPU
(--) Oct 09 23:25:05 NVIDIA(0): Connected display device(s) on GeForce GTX 295 at PCI:5:0:0:
(--) Oct 09 23:25:05 NVIDIA(0):     HP LP2465 (DFP-1)
--- End code ---

sunu:

--- Quote from: pp on 09 Oct 2009, 06:26:18 pm ---That was my understanding too but in my case Boinc 6.10.13 didn't find ANY cuda-devices when I had SLI enabled... I'll just leave it off for now.

--- End quote ---

That could mean either a boinc problem (couldn't see the graphics card, even though it was there) or an nvidia driver problem that couldn't load when you had sli enabled.

pp:
Added an Xorg.0.log snippet in my previous post. It said Multi-GPU enabled and X started without problems... no big deal. I took the opportunity to try it while I was upgrading Gnome to 2.26.

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