Forum > GPU crunching
[Split] PowerSpectrum Unit Test
Ghost0210:
Despite finding a couple more posts (after spending a few hour searching) saying that it is possible to enable TCC mode on non-Tesla cards, I haven't been able to get it running on my 465.
At the moment all I have managed is to change the compute mode ruleset through nvidia-smi. Although DeviceQuery still says its running in Default mode, so wether this has had any real affect or not is up for debate >:(
Think its about time to give up on this idea unfortunately, shame though, it would have been nice to get it working as all this card does is crunch Seti
Jason G:
Yeah tried that compute mode thing too. With Fermi's we want 'Normal' mode anyway, so as to allow multiple instances ;).
I've thought about it, and to bypass the issue altogether I'll try get another hard drive sorted sometime soon, and use it to dualboot to WinXP32. That way I can keep my snazzy Win7 dev environment, yet leave for extended period crunching under XPDM. I have XPx64 as well, but since 64 bit Cuda apps yield a net small slowdown, it seems illogical to use that copy for that.
If it had been a matter of the current ~10% difference stock sees between the driver models, I wouldn't have gone to the trouble of DualBoot. My optimisations, on the other hand, yielding ~30% in favour of XPDM, really force the issue for me (even though faster on Both OS /Driver Models), since a lot of the refinement achieved here with a small kernel is likely to apply through most of the application (after a lot of work). That translates to a crapload of compute performance in my book, since the single 480 on Wolfdale,, x32f on Win7x64) was sustaining 25-26k RAC when there was work. Much as I dislike RAC as a measure, ~10% extra there (current code) would only boost it to ~27-28k or so (within work dependant variation anyway), ~32k, though, seems more definite & well worth the added effort. ( [Edit:] then add optimisation benefit I suppose )
Jason
Miep:
--- Quote from: Jason G on 30 Nov 2010, 11:37:35 am ---OK, non-critical unless I make computation mistakes ( I was mostly concerned here to not make code slower...). Stock / x32f code there is doing something your GPU doesn't like IMO.
Was that quadro 'integrated & using some portion of system memory ? or does it use dedicated memory ?
--- End quote ---
I dug out a 'shared memory: no' from a german comparison site. its got 256M of it's own as far as I know.
nvidia control panel system info comes up with
total available 1535 MB
dedicated 256 MB GDDR3
sytem video 0MB
shared system mem 1279MB
Jason G:
Great, thanks. Yes the dedicated number is the clincher, it's a discrete GPU then, explaining why it didn't trigger a special integrated GPU optimisation I made in the last test (that particular functionality remains untested/verified). The shared bit will just be system memory the driver's using for WDDM paging. I only care about that because It looks like santa might be bringing me an ION2 based netbook (I was a good boy all year, sortof) , so poking around with that functionality early seemed a good idea.
Ghost0210:
--- Quote from: Jason G on 03 Dec 2010, 02:45:34 pm ---Yeah tried that compute mode thing too. With Fermi's we want 'Normal' mode anyway, so as to allow multiple instances ;).
I've thought about it, and to bypass the issue altogether I'll try get another hard drive sorted sometime soon, and use it to dualboot to WinXP32. That way I can keep my snazzy Win7 dev environment, yet leave for extended period crunching under XPDM. I have XPx64 as well, but since 64 bit Cuda apps yield a net small slowdown, it seems illogical to use that copy for that.
Jason
--- End quote ---
I was thinking about something similar - just ordered a couple of 1TB drives and a raid controller, so after migrating my current data drives to those (and finally getting some internal redundancy :)) I'll have a spare drive that I was planning on either loading with Linux, or XP if I can find the disk again. A 30% boost is definatly worth the extra effort of setting up the dualboot. Although I may just run a VM for Boinc (depending on wether I can get the GPU's to be seen by the VM) and how good Boinc operates, I'll create an XP VM and run it that way
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