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Posts by Astromancer.

21) Message boards : Number crunching : Status: "Validate Error" and still getting credit? (Message 44029)
Posted 21 Nov 2010 by Astromancer.
Post:
So I started crunching MW again today and looking through my tasks found a number of WU's that are marked "Validate Error" in the status but are still giving me full credit for doing them.

Both of which I find odd as I never used to have any errors with validation.

I didn't see any other posts about this so made a new one. Sorry if I missed something.


EDIT:: To add it's happened with both ATI and nVidia units. 3870 and GTX260. CPU units are still running.

EDIT2: Another unit was a Quorum: 2 unit and when I returned my result it canceled the 2nd result out there and gave me credit which also seems quite odd.
22) Message boards : Number crunching : GPU Stock App Vs. SSE2 (Message 42552)
Posted 4 Oct 2010 by Astromancer.
Post:
Oh, I figured the stock app was the non SSE2 version that was up on your site for 32 bit.

Didn't expect them to use the SSE2 as the default. More compatibility and whatnot.


Thanks for the info Arkayn.
23) Message boards : Number crunching : GPU Stock App Vs. SSE2 (Message 42544)
Posted 4 Oct 2010 by Astromancer.
Post:
Since I was out there I figured I'd just do it and see what happened.

Turns out there is no difference on this machine at least. Kind of what I figured would happen.


Figured I'd update this to perhaps help someone else out in the future that is doing a search for the info or whatever.
24) Message boards : Number crunching : GPU Stock App Vs. SSE2 (Message 42540)
Posted 4 Oct 2010 by Astromancer.
Post:
So I happened to wind up checking out the Op Apps on Arkayn's site and saw there was a SSE2 version of the GPU app.

Will this give increased performance when compared to the stock app? And is it enough of a boost with a 3870 to bother doing it?

Thanks guys!

::Edit::

I'd do the testing myself, but it's my parents computer that I slapped an old graphics card into. So not the easiest for testing! ;)
25) Message boards : News : windows intelx86 and x86_64 binaries added for the nbody simulations (Message 41713)
Posted 24 Aug 2010 by Astromancer.
Post:
Arjan, thanks for that App_Info. It works great for running both at the same time.

I've only wound up with one error so far and it seems that the WU is messed up (I'm the 2nd error). If anyone cares to look at the computer it's http://milkyway.cs.rpi.edu/milkyway/results.php?hostid=201146.

I have to admit I'm liking the short run times, but assume they'll have to unfortunately get longer to get any good data. :P


My only real complaint is that it keeps on downloading 4 nbody WU's and only 2 ATI WU's. (0.02 day buffer just to keep from having to wait on downloads). But this seems to be more of a factor of for some reason BOINC thinks the ATI WU's will take like 4.5 hours. And it just so happens that it does an upload / download right before the task finishes so it works out perfectly.
26) Message boards : Number crunching : Amount of concurrent blocks (Message 40543)
Posted 19 Jun 2010 by Astromancer.
Post:
The field concurrent blocks dictates how much of the GPU will be used by the application in a single iteration. The more concurrent blocks the faster the workunits are finished, but it will cause more user interface lag.


Much like Sutaru I didn't see any difference in completion time or interface responsiveness between 128 and 50,000. And my screen is run through the video card.

GTX260 55nm with 216 cores as well. Perhaps it would have more effect with single precision calculations where the gpu is more completely used for the computation?


nmeofdst8, As for memory usage, GPU-Z reports the same ammt of memory used no matter what the setting is set to.
27) Message boards : Number crunching : Travis is camping with Milkyway (Message 40191)
Posted 4 Jun 2010 by Astromancer.
Post:
He cursed the weekend when he asked us to not break things! hahaha :D
28) Message boards : Number crunching : Boinc 6.10.56 - backup project (Message 40178)
Posted 4 Jun 2010 by Astromancer.
Post:
And on a completely unrelated note, I've gotten the nbody simulation code from another one of our astronomers here. And in a month or so we should have a single-precision GPU friendly application that will simulate the interactions between the milky way and other dwarf galaxies, which will be REALLY cool.


Interesting... I had thought it was impossible to obtain the same calculation accuracy with single precision FP? I'm no programmer though. Is it some programming trickery or a complete redesign that doesn't need the same type of accuracy?

Either way, very cool. Might be time to see if friends and family have any old graphics cards their willing to part with. :D I still have 2 free PCIe slots on my computers.
29) Message boards : Number crunching : GPU Requirements [OLD] (Message 40147)
Posted 2 Jun 2010 by Astromancer.
Post:
CUDA might be more widely used, but the ATI cards are thrashing them in the WU completion category.

The top 200 hosts all run ATI cards here, pretty much the same thing at Collatz.

GTX 480 is taking about 200 seconds more than a 5870 and about 100 seconds more than my 5830.


True the ATI cards are faster in the projects they are used in, but this is the only project that I crunch that supports ATI cards currently.

So I say NV for crunching (For myself at least) as it allows me to run more projects on my GPU as of right now. Hopefully OpenCL will change that at some point though!
30) Message boards : Number crunching : GPU Requirements [OLD] (Message 40130)
Posted 2 Jun 2010 by Astromancer.
Post:


And to add to the GPU list, the 5830 is missing. Unless what I've read is wrong on it doesn't support double precision FP calculations?


It does support double precision, the list has just not been updated in a long time.


Good to know for sure. Thinking of getting one though more for gaming than crunching. If I were buying for crunching I think I'd go NV again since CUDA is more widely used. But I've always liked the ATI drivers better :)
31) Message boards : Number crunching : Suspend work if CPU usage is above (Computing Preference Setting) (Message 40128)
Posted 2 Jun 2010 by Astromancer.
Post:
Might be the wrong forum *shrug* But it seemed right.

I just recently changed my settings on the MW website instead of the SETI one. And after having my crunching start randomly pausing I realized that by doing so it reset the "Suspend work if CPU usage is above" setting to 25% instead of the 0 (Ignore) that I had it set at in my SETI settings.

So I figured I'd post this here figuring I'm not the only one who changes this setting. And I figure if we ask nicely that it'll get added when someone has some time.

Thanks guys :)
32) Message boards : Number crunching : GPU Requirements [OLD] (Message 40127)
Posted 2 Jun 2010 by Astromancer.
Post:
I am running an ATI HD Radeon 4870 X 2
Why can I only get 6 WU's in my que at a time?

When I do network maintenance I run out of work real quick. What a shame.


Like TGG said, 6 WU's per CPU core. So if you want a bigger cache I guess you need an i7 for the HT. Think I need to change my cache settings so the SETI work cache is about the same size as the MW one...


And to add to the GPU list, the 5830 is missing. Unless what I've read is wrong on it doesn't support double precision FP calculations?
33) Message boards : Number crunching : Boinc 6.10.56 - backup project (Message 40110)
Posted 1 Jun 2010 by Astromancer.
Post:
Ah, thanks Paul.

I may try going through BAM again to override the settings there, or turning the cache back on so I have some stored up WU's for those times where MW and Seti are having issues.

Been getting a lot of project has no work when requesting GPU tasks from both of em in the past 5 days or so.
34) Message boards : Number crunching : Congratulations to our Fearless Leader Travis!!! (Message 40093)
Posted 1 Jun 2010 by Astromancer.
Post:
The Robert McNaughton Prize: An annual prize established in honor of Professor Robert McNaughton, scholar and teacher in the computer science and mathematical sciences departments from 1967 to 1989. The prize is given to an outstanding graduate student in computer science


If you read that off the pic... I think I need a new monitor or something! hahaha

I guess all those long hours working with all of us crazy crunchers got him some deserved recognition. :D
35) Message boards : Number crunching : Congratulations to our Fearless Leader Travis!!! (Message 40091)
Posted 1 Jun 2010 by Astromancer.
Post:
\0/ Congrats!

So what was the award for?
36) Message boards : Number crunching : Boinc 6.10.56 - backup project (Message 40089)
Posted 1 Jun 2010 by Astromancer.
Post:
Any of you guys happen to try this with projects other than Collatz?

I myself tried it with Einstein and when I set 0 resource share on their site it tells me it saved it, but it's still set at 100. (I'm currently using a NVidia GPU).

Any suggestions on a way to override it perhaps?
37) Message boards : Number crunching : NV Opp App? (Message 40001)
Posted 28 May 2010 by Astromancer.
Post:
Technically speaking, the ATI apps are not optimized either as they are the same exact version that the server sends you. The app_info allows different setting that can speed up the crunching slightly or give you more response on the system.


That's cool that Travis and the gang used the user created apps for the ATI client!

When last I was crunching there was no official ATI client so I was surprised when it downloaded a NV one right from the start.


It'll make my life easier once I cobble together my spare parts BOINC drone box since I won't have to worry about updating the project app.
38) Message boards : Number crunching : NV Opp App? (Message 39998)
Posted 27 May 2010 by Astromancer.
Post:
Hey all!

After my computer going out of action a while back I finally have everything back up and running.

But, I've got a GTX260 instead of my old 3870. Pretty close speed wise with the crunching. The 3870 was going about 8 min per unit (This was Dec / Jan units) and the 260 is running at 13 min per with current WU's.

Not sure if the WU's have changed and the card is crunching faster than I'm giving it credit for...



But on to the reason of the post. I took a look around at the usual places for an Opp App and didn't see one for NV. So I figured I'd do a quick post here to see if I was missing it / looking at the wrong sites or if there just isn't one?

Thanks!
39) Message boards : Number crunching : Run time is zero (Message 34971)
Posted 31 Dec 2009 by Astromancer.
Post:
Mine is the same, though I honestly don't remember seeing the run time in my details prior to just looking at it now.

Maybe it was there and I always somehow missed it? Or is it new with the server update?
40) Message boards : Number crunching : Current List ATI card support (Message 34970)
Posted 31 Dec 2009 by Astromancer.
Post:
Unless ATI changes something, they only have the x8xx cards support double precision. Kind of odd, but not much we can do about it.

Currently the 4850 / 4870 are cheaper than the 5770 and the 4870 at least is right around on par in gaming performance. I'm looking at getting myself a $100 4850 to replace my 3870, should be a nice boost to my gaming and crunching.


As for cards not working I was told when I started up that currently to get an ATI card running on MW you need to use the optimized app. And read something in the last few days where Travis did say he was going to put the ATI app serverside after he irons out the current set of server bugs. So if you don't want to run the op app it should start working on it's own accord sometime soon.


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