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Profile Michael Banta
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Message 1459024 - Posted: 31 Dec 2013, 4:43:51 UTC

Hello.

I have a GTX 780 that I am running 3 work units against. I just discovered TechPowerUp and it states that I am averaging about 50-60% on the GPU load. So sometimes it spikes up to 80% and sometimes it drops to 30%.
Should I through a 4th work unit at it to try an max out the GPU utilization? I've never read of anyone using more than 3 at a time.

Thanks
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Message 1459025 - Posted: 31 Dec 2013, 4:50:07 UTC - in response to Message 1459024.  

Hello.

I have a GTX 780 that I am running 3 work units against. I just discovered TechPowerUp and it states that I am averaging about 50-60% on the GPU load. So sometimes it spikes up to 80% and sometimes it drops to 30%.
Should I through a 4th work unit at it to try an max out the GPU utilization? I've never read of anyone using more than 3 at a time.

Thanks

Depends on how much video ram the card has.
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Message 1459026 - Posted: 31 Dec 2013, 4:51:53 UTC

Is that the 780 with 3 gig of video ram?

I think I have run 7 or 8 wu on my 2 gig card. But you hit a point of diminishing returns.

Since you have 3 gig of video ram, sure, you can run 4 wu.
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Profile Michael Banta
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Message 1459027 - Posted: 31 Dec 2013, 4:53:05 UTC - in response to Message 1459025.  

It has 3gigs. just replaced .33 with .25 and the monitor shows 999mb of ram being used and gpu utilization averages around 55%.

more?
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Message 1459028 - Posted: 31 Dec 2013, 4:55:42 UTC

Also I am only using 20% of 1 cpu on an 8 cpu system.

so 5 WUs would be .20 I assume.

Thanks for the replies.
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Message 1459034 - Posted: 31 Dec 2013, 5:57:40 UTC - in response to Message 1459028.  

so I might want to try 6 work units (just for fun) because 5 WU are going smoothly. would I use .15 to get 6.6 units(or just 6)?
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Message 1459035 - Posted: 31 Dec 2013, 6:07:45 UTC - in response to Message 1459034.  

ok I tried .16 and I have 6 GPU WUs running now.
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Message 1459036 - Posted: 31 Dec 2013, 6:18:24 UTC

How much CPU are you now using? I went from the mid 60s to the mid 90s utilization on similar cards when I went from crunching one to three units per CPU. I didn't get a 30% boost in WU crunched though.
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Message 1459041 - Posted: 31 Dec 2013, 6:33:37 UTC - in response to Message 1459036.  

With 6 WUs running now, my GPU utilization is 60% and I'm using around 1.7GB or 3GB of video RAM.

Need to let that run a few days and see what happens.

Mike
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Message 1459076 - Posted: 31 Dec 2013, 10:15:41 UTC

Video RAM usage is no guide to the actual processing rate - my 780s are running at about 95-98% processing rate, but I'm only running 3 MB per card. Yours will be thrashing tasks around in memory looking for free GPU cores to do a bit of work.
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Message 1459162 - Posted: 31 Dec 2013, 14:12:58 UTC - in response to Message 1459076.  

Thanks Rob.

So even though I'm using half of the video cards RAM(which has nothing to do with it anyway says you), running 6 WUs is bad even though I'm not fully utilizing the video cards GPU cores.

Since you have these cards also, what do you recommend for max WUs then?
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Message 1459165 - Posted: 31 Dec 2013, 14:18:59 UTC

Personally I would've started running 3 until the RAC stabilized and then add another until it stabilized again then add another into the mix until things start going backwards.

Cheers.
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Message 1459168 - Posted: 31 Dec 2013, 14:21:53 UTC - in response to Message 1459165.  

yea I did that initially, but got the impression from reading feedback and such that I want the GPU to be more utilized. It was only hanging around 50% with 3 WUs.

Thanks
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Message 1459169 - Posted: 31 Dec 2013, 14:23:00 UTC

Three per - anything more and they are definitely struggling to do productive work. Mine sit in excess of 90% all the time, more often than not over 97%.
Over three and you start to see a fall-off in the GPU utilisation.
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Message 1459171 - Posted: 31 Dec 2013, 14:24:31 UTC - in response to Message 1459169.  

Ok, but that doesn't seem to be the case with my setup. Wonder why.

Thanks
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Message 1459177 - Posted: 31 Dec 2013, 17:37:32 UTC
Last modified: 31 Dec 2013, 17:38:06 UTC

Your cards are definitely to slow.
You should get approx same times like my 7970 ~1400 sec for a .40 (mid range) WU.

Try to free another CPU core to feed the cards properly.


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Message 1459198 - Posted: 31 Dec 2013, 18:42:02 UTC

On my EVGA 780 FTW´s 3WU at a time is the optimal setting. But be aware, you run normal lunnatics optimized apps, so you need to free one core per WU you run on your GPU + one (example 3 WU, leave no less than 4 cores free), or go to beta and DL the latest build that uses a lot less CPU.

Of course YMMV.
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Profile Michael Banta
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Message 1459199 - Posted: 31 Dec 2013, 18:42:15 UTC - in response to Message 1459177.  

Thanks Mike.

The machine hosting the 780 has is a quad processor. I only have 1 processor running at like 1% of the time. How do I free more up?

Thanks
Mike also
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Message 1459203 - Posted: 31 Dec 2013, 19:01:35 UTC - in response to Message 1459199.  
Last modified: 31 Dec 2013, 19:12:05 UTC

The usual cause of throttling is heat. I suppose there could be other causes for that card to throttle though. Trying it in another machine might help.
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Message 1459225 - Posted: 31 Dec 2013, 19:34:53 UTC - in response to Message 1459199.  
Last modified: 31 Dec 2013, 19:43:21 UTC

One of mine 780 host is an old slow Quad CPU Q8200 @ 2.33GHz. Just stop all cpu crunching and see. Then increase one cpu WU at a time until you obtain the optimal setting. An stupid question, are you sure your PCI-e is at least 2.0 and runs at 16x?
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Message boards : Number crunching : GPU utilization


 
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