Uneven usage of GPUs


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Message boards : Number crunching : Uneven usage of GPUs

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Message 1300731 - Posted: 31 Oct 2012, 16:09:38 UTC - in response to Message 1300702.

I had this issue before, in my case happens when for some reason the nvidia driver is corrupted, for example if you try to do remote access with RDP. Normaly restarting the computers solve the problem.


I use RealVNC to connect to this rig, however, it never used to give this message. And yes, restarting the rig solves the issue until I access it again. Hopefully a clean reinstallation of the graphics driver will solve this.


This may not be a problem with your video driver, it may be a problem with the graphics drivers that RealVNC uses, just as if you were using RD. The reason I say this is because you are displaying the exact symptoms I had when using Windows RD. I found that LogMeIn (also free) did not cause this problem. It was members of this group that pointed me in the right direction at the time.

You got to it first. Yes VNC basically doesnt allow BOINC/S@H access to the drivers which either stops the WU in progress or kills it outright
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Profile Bernie Vine
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Message 1300799 - Posted: 31 Oct 2012, 20:54:48 UTC

I have used VNC for years all flavours and never had it affect any GPU crunching on any of my machines.

However there is a "Video Hook Driver" that I normally don't install. Perhaps it's that.


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Message 1300991 - Posted: 1 Nov 2012, 14:42:02 UTC - in response to Message 1300799.

I have used VNC for years all flavours and never had it affect any GPU crunching on any of my machines.

However there is a "Video Hook Driver" that I normally don't install. Perhaps it's that.


I use the RealVNC video hook driver on my HTPC, which isn't doing work at the moment. However when I have BOINC running with the CPU & GPU I have not had any issues with BOINC stopping/suspending work when I am connected remotely.
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Message 1302520 - Posted: 5 Nov 2012, 17:59:30 UTC

My patience was wearing thin, so instead of experimenting with VNC and video drivers and possibly something else, I just went ahead and did a clean re-installation on this rig and till now everything 'seems' to be running smoothly.

I must add that the second rig that I have has never exhibited any issues with either the graphics driver or the VNC (no hook drivers). Only the rig running GTX 480 somehow always misbehaves.

A quick question - if a GPU by itself generates an RAC of x, is it safe to assume that two of these cards would give 2x RAC? Or is it just theoretic?

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Message 1302524 - Posted: 5 Nov 2012, 18:06:53 UTC - in response to Message 1302520.



A quick question - if a GPU by itself generates an RAC of x, is it safe to assume that two of these cards would give 2x RAC? Or is it just theoretic?

Should be close, but maybe not quite. 2 GPUs require more support from the host computer's CPU and RAM, so depending on those systems, 2 might not 'quite' get double what the single one would do.
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Message boards : Number crunching : Uneven usage of GPUs

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