More then 1 WU at the same time.
27 Jul 2012 15:35:04 UTC
Topic 196463
(moderation:
Hi!
I often read in the forum to compute more then 1 WU @ the same time on the GPU. But i cant use appinfo because einstein blocks this. How can i change it? Is it this brp utilization thing with the big big warnung letters? ^^
Thx :)
More then 1 WU at the same time.
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Yep, exactly! (And they are big red, not big big ;-)
Gruß,
Gundolf
[edit]And it's "warning" and "more than". (Sorry, couldn't stop myself;-)[/edit]
Computer sind nicht alles im Leben. (Kleiner Scherz)
RE: [edit]And it's
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If you want to be **** about it, it's also "can't", "I" and "Einstein". ;-)
But dskagcommunity best do not do this on either of his GPUs as he'll need a Fermi style (4xx) card or better for it. Or an AMD Radeon 5xxx or better. The user only has (2) 9800 GTX and an 8800 GT, both of which can't do this!!
RE: RE: [edit]And it's
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I happen to disagree with you. I'm running 2 WUs on a GTX9800 for at least the past year. I started with an app_info.xml and switched to using the "utilisation setting" in the preferences when they became available - no problem at all. As long as the card has enough memory to support two WUs I don't see any problem.
mickydl*
RE: I happen to disagree
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Oh sure, you can also run super gasoline when your engine normally requires regular gasoline, but that doesn't mean that your engine was built to run with the super gasoline. Same way here, the older GPUs can certainly run more than one task, but weren't built with that in mind. It can wear them out way earlier. But whatever your mileage. I'm not going to advise people with non-Fermi or above style GPUs to try this, before you know it they break their videocard and come blame it on Einstein and me. Naha.
Thx for ya help Gundolf, it
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Thx for ya help Gundolf, it runs with 3 WUs at the same time now :)
What are you talking about? i asked for the computer with the 560TI ^^ its not hidden :P you dont need fermi cards for this. you only need enough VRAM. I, just waiting now until a cooler day to test RAC, but i calculated around 36k.
Why it should break? Run more then one WU on the card doesnt do anything. Einstein is not the only project where i use to run more then one WU at the same time when it has a massive increase of overall performance. Only more GPU Load so it perhaps runs hotter and could only fail earlier when they dont get a good cooling but with such old cards ..it doesnt matter. The most of my BOINC Machines are running in a room with AC. None of my 8 BOINC GPUs are broken until today :)
DSKAG Austria Research Team: [LINK]http://www.research.dskag.at[/LINK]
RE: What are you talking
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When I checked your systems only the ones with the 8800 and 9800 were visible in the active computers. Seeing how you only have work on the 560Ti since the 28th of July, that's correct. At the time of my posting on the 27th of July the computer with the 560Ti was not showing as an active computer. You also did not specify which computer or GPU it was going to be on in your initial post. Maybe you were thinking it, but alas I am not capable of reading thoughts over the Internet.
Besides that you contradict yourself in the part following that, by first saying it doesn't do anything, then acclaiming it runs hotter than normal and could fail earlier, that is exactly why one shouldn't try this on older non-Fermi and above style cards or when you do not complain here at the forums (or at me) when it breaks. Is all I said.
Blowing up a videocard can take out a complete motherboard, the PSU and other things as well. I'd thread very carefully saying it's easily done on the older GPUs.
RE: RE: I happen to
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Actually, there's no harm in running with a higher octane gas in one's car; there's only question wrt whether it will help or not.
This said, even some people, where the mfg doesn't suggest the higher octane (which is to say it's really necessary, or things won't run all that well), some have found that in the hotter summer months, bumping it up to mid grade, or supreme might help, if one doesn't want to have to turn off the air conditioner when going up hill. AKA, the loss of power at maintaining speed, on the up hill if the a/c runs. Winter, they might not notice it as much...
In this, I'm not entirely sure how much it does/doesn't help though, as 1 task doesn't seem to utilize the whole core, but at the same time it's using more then half the core. On my laptop which has a GT 650m using 1 GB gddr5 (Keppler core obviously) I noticed some variation with this project ranging from around 56% to about upper 70s of % of the core being utilized. Obvoulsy on average it's using about 2/3, but if one loaded 2, there'd be an overlap between 1/2 and 2/3 of the core (I'm not sure the exact % as it fluctuates a fair bit in that range according to GPU-ID, when I tracked this), hence it really wouldn't run 2 tasks in the same time. There would be some slow down, but it would stay around 96-98% of the GPU at all times, rather then fluctuate between 56% and 78% or so.... This is with the lattest beta drivers from nVidia, on the gt650 gddr5 variant, with BOINC keeping the GPU at the max clock, not the base, the whole time.... This said, lightening the load, the laptop and BIOS still sees itself as able to run at the higher clock, and as it sits at 58 c on the GPU, it isn't really getting unreasonably hot, there...
The use of more than 1 WU at
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The use of more than 1 WU at a time on a GPU makes sense in Einstein like makes on SETI? If makes, where can i found a working example off the app_info.xml needed to do that? Thanks in advance for any help.
RE: The use of more than 1
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Yes - though as with all nVidia (cuda) applications, it only makes sense on Fermi-based (GTX 4xx/5xx) and Kepler-based (GTX 6xx) hardware, with hardware accelerated task switching available.
You don't need an app_info file: set the value directly on your Einstein@Home preferences page.
Note that Einstein tasks use more VRAM than SETI tasks, and also transfer more data over the PCIe bus. It may be advisable to start with a higher value - fewer tasks per card - than you use at SETI.
RE: RE: The use of more
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Thanks, I´m aware of that and only have 500/600 cards.
Test and works, the only wierd thing is in some hosts the change makes no diference, still running 1 WU, even i set 0.5 or 0.33 on preferences. Any clue?
The hosts are: (one with 690+670 and the other 2x670)
http://einsteinathome.org/host/6107765
http://einsteinathome.org/host/6107754