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MilkyWay@Home project support thread - Page 5

post #41 of 221
Quote:
Originally Posted by gamer11200 View Post

My apologies, I misread the 30 minutes referring to the GPU application.

I was just going by the Wikipedia article about the 7xxxD GPUs (http://en.wikipedia.org/wiki/Radeon_HD_7000_Series#IGP_.28HD_7xxxD.29), it may be wrong when it said that those models don't support double precision. That, or there are GPU applications that can be used on non-double precision.

According to our member-updated database of runtimes, an HD 4850 takes about 4 minutes to complete. That's the slowest card that has been entered into the database for milkyway@home GPU.

Seems that the 7660D is between Nvidia GT 640 and AMD Radeon HD 5570 in performance. I'm just doing to estimate that the 5570 is about 1/3 of the performance of a 4850. Even then, 12 minutes is much faster than what you are getting.

I know that those APU graphics are dependent on RAM speed. What speed is your RAM running at? (It might not make a big difference, but worth to look at)

No worries.

And yeah, my 7660D is heavily overclocked, fed by 2133 RAM and has a NB link of 2.2GHz so I actually get about 1,800 in the 3dmark graphics test, as opposed to the stock score of around 1,400-1,500. So I should be able to compete with some discrete cards of not too long ago.
post #42 of 221
Try running the GPU app without any CPU tasks running or with 3 instead of 4.
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post #43 of 221
I'll try that.

In FAH I know how to set that up, but how do you do it in BOINC?
post #44 of 221
Thread Starter 
Quote:
Originally Posted by Finrond View Post

Try running the GPU app without any CPU tasks running or with 3 instead of 4.

That could actually be why you're getting the slow times. I forgot about the way the APUs work
Quote:
Originally Posted by Centauri View Post

I'll try that.

In FAH I know how to set that up, but how do you do it in BOINC?

In BOINC, go into Advanced view (ctrl+shift+a or view->advanced view). Then go to tools->computing preferences. Changing "On Multiprocessor systems, use at most" to 75% should work.
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post #45 of 221
Thanks. And what about dropping CPU core usage entirely? Because 0 just seems to let the client start all 4 again.
post #46 of 221
Thread Starter 
Quote:
Originally Posted by Centauri View Post

Thanks. And what about dropping CPU core usage entirely? Because 0 just seems to let the client start all 4 again.

To drop CPU usage entirely, you will have to exclusively run GPU work units and not run any projects that uses CPU.

For Milkyway@Home:
Login to your Milkyway@home account here: http://milkyway.cs.rpi.edu/milkyway/login_form.php?next_url=home.php
Click on "MilkyWay@Home preferences"
Click on "Edit MilkyWay@Home preferences"
And then change the options so that the checked box is only for "Use AMD (ATI) GPU"
From there, the work units that you currently have will complete and no new CPU work units will be sent. You will only receive new GPU work units.


These steps also apply to other projects as well. Login to your account on the project's webpage and choose what work units you want to do.
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post #47 of 221
Dropping to 50% CPU got me maybe 10% better performance from my Radeon. Killing all CPU crunching beyond that made no difference whatsoever.

So I'm at about 27 mins right now on GPU crunches. Frustrating, because my GPU is much more capable than those times are reflecting. frown.gif
post #48 of 221
Quote:
Originally Posted by Centauri View Post

Dropping to 50% CPU got me maybe 10% better performance from my Radeon. Killing all CPU crunching beyond that made no difference whatsoever.

So I'm at about 27 mins right now on GPU crunches. Frustrating, because my GPU is much more capable than those times are reflecting. frown.gif

Can you check to see if your GPU usage is steady and near 100%?

Also, I looked it up and your GPU does NOT feature double precision FP, so it may be emulating it someway which would account for the poor performance.

EDIT: Also could we get a screenshot of your running BOINC tasks?
Edited by Finrond - 3/26/13 at 12:26pm
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post #49 of 221
It's definitely not a consistent 100%. Heck, I can run BOINC and F@H GPU tasks simultaneously and the usage chart still reads like a seismograph.

http://gpuz.techpowerup.com/13/03/27/6cq.png

http://img198.imageshack.us/img198/3595/68823205.png
post #50 of 221
Quote:
Originally Posted by Centauri View Post

It's definitely not a consistent 100%. Heck, I can run BOINC and F@H GPU tasks simultaneously and the usage chart still reads like a seismograph.

http://gpuz.techpowerup.com/13/03/27/6cq.png

http://img198.imageshack.us/img198/3595/68823205.png

That usage graph looks pretty steady to me with only a couple occasional dips. The bigger dips are with your core clock but even then its occasional. I find it bizarre that your GPU supposedly doesnt support DP and yet... here we are with a running WU.
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