Multi thread GPU

[ggdh]

So what sort of real numbers you are getting from, let's say, 7950 and 7970? And how it compares to Nvidia cards? If I understand correctly you run multiple WUs at the time to keep it busy but then you have to feed it with CPU cores? I've noticed when tried my GTX580 that the WUs were ready after ~2 minutes and another 20sec it was sitting at 99%. Would running more WUs make it more efficient as they would "overlap"?

[Mydog]

So what sort of real number you are getting from, let's say, 7950 and 7970? And how it compares to Nvidia cards? If I understand correctly you run multiple WU at the time to keep it busy but then you have to feed it with CPU cores? I've noticed when tried my GTX580 that the WUs were ready after ~2 minutes and another 20sec it was sitting at 99%. Would running more WUs make it more efficient as they would "overlap"?

The WU's first run on the CPU then get handed over to the GPU then goes back to the CPU at the end, the GPU can handle more than one but no use loading it with more than you got cores/threads on the CPU.

[Toolius]

I need some help guys..
Having a tough time figuring out how to get my 2x 7970's to crunch 6 tasks each. Have a 3960x but would like to crunch only gpu on this rig..
Do i need the app_info file or something ? I cant seem to find one
Cheers and kind regards guys

Edit : Used the GPU only app_info from oldchap's thread of working app_info files and set the thread count to .25 and now have 8 tasks being crunched by my 2x 7970's.
What would the tread count setting be for 10x and 12x tasks in the app_info file guys ?
Cheers again !

[Snow Crash]

Formula for <count> ((100 / x) * .1)
Where x is the number of WUs you want to run per card

With 2 cards in the rig ... to run 5 current tasks per GPU set the count to .2
With 2 cards in the rig ... to run 6 current tasks per GPU set the count to .16

[bluestang]

These WU locking up are pi$$ing me off. Came home last night from work and 4 WU were locked up for 2+ hours. Reset them and then a little later more locked up. Even went to 6 and 8 WU and still lockups. Went back to 6 before bed and woke up to 6 locked WU sitting at 5 hrs...WTF!

Reset and I'm now trying 5 WU and went to work. Hopefully no lockups while I'm at work and away from home. This is definitely either a driver issue or something in certain WU causing these lockups.

With those thoughts of anger of how munch crunching time we have all lost to locked GPU WUs...can a script be written or an option placed in a .xml file somewhere to automatically abort WU whose elapsed time has reached a certain time??? I mean if it hits 10-15 minutes on a 7870 or higher card, then it's locked and needs to be aborted (or suspended and resumed) automatically.

[pirogue]

So what sort of real numbers you are getting from, let's say, 7950 and 7970? And how it compares to Nvidia cards? If I understand correctly you run multiple WUs at the time to keep it busy but then you have to feed it with CPU cores? I've noticed when tried my GTX580 that the WUs were ready after ~2 minutes and another 20sec it was sitting at 99%. Would running more WUs make it more efficient as they would "overlap"?

7970 running 6 on a 2600K @ 4GHz (not just crunching):
10/22/2012 0:005:08:02:36 652,653 3,124

7870 running 8 on a 980X @ 4GHz (just crunching):
10/22/2012 0:005:19:03:59 532,961 2,266

Keep in mind that some of the output is from earlier processed WUs that just got validated yesterday.

[Sparky]

Geez I REALLY need to get more threads going on my 7950. That, and I really need it to get through the CPU unit backlog already so it can do GPU again.

[krjalone]

7870@1350 running 8 on a 3930K@4.9GHz (main pc)
10/22/2012 0:011:03:38:05 635,455 2,675

7870@1170 running 6 on a 3930K@4.7GHz (cruncher only)
10/22/2012 0:007:18:39:07 518,165 2,280 This now running 8 too and both are still raising.

Remember to Install New CATALYST 12.11 beta. Made difference to me.

[bluestang]

7870@1350 running 8 on a 3930K@4.9GHz (main pc)
10/22/2012 0:011:03:38:05 635,455 2,675

7870@1170 running 6 on a 3930K@4.7GHz (cruncher only)
10/22/2012 0:007:18:39:07 518,165 2,280 This now running 8 too and both are still raising.

Remember to Install New CATALYST 12.11 beta made difference to mee.

More stable? Less WU locking up/stalling?

[Bun-Bun]

My 7850's do two WU's each in about 2-3min.

My GTX670 does two WU's in about 7-8min.

My 7950 does 8 WU's in about 2-4min. (And has been going 16 hours without hangup and GPU usage never goes below 75%)

Vinas's multi client method is more efficient then app_info and have never had a WU hang. What I mean is a 7850 by itself does a WU in just under 2min. app_info .5 for 2 threads it goes up to about 3min but with two clients to get it to two threads it takes 2min just like 1 thread.

I also never had a Nvidia WU hang.

[pirogue]

Remember to Install New CATALYST 12.11 beta. Made difference to me.

You skipped the new 12.10 and went straight to the new beta?

[krjalone]

More stable? Less WU locking up/stalling?

I had a little better oc on cards. I was also getting some slow downs when web surfing and WCG on backround full load. GPU load is also more consistent 98-99 %
Old driver was 12.9

[Movieman]

I had a little better oc on cards. I was also getting some slow downs when web surfing and WCG on backround full load. GPU load is also more consistent 98-99 %
Old driver was 12.9

AND YOU! You stay away from my slice..I saw you last night kicking me aside like I was yesterdays old fish!

[Movieman]

I need some advice.. Adding two 7970's to the beast machine or as I have taken to calling it lately : WLG for Wimpy Little Girl compared to some of your monsters.
What is the best setup to do with these cards or should I just take them and stick on the 2600K?

[Bun-Bun]

A single 7970 will reach the daily 2500 WU cap.

But Vinas's method makes a new host for each instance running (making the 2500 WU a day a moot point). So if you feel up to it you can configure 8 instances of BOINC to run.

How many threads is that thing? 32? With 8 BOINC's configured set to use 12.5% of processors each instance will run 1 thread per GPU and than 2 threads on CPU.

[Movieman]

A single 7970 will reach the daily 2500 WU cap.

But Vinas's method makes a new host for each instance running (making the 2500 WU a day a moot point). So if you feel up to it you can configure 8 instances of BOINC to run.

How many threads is that thing? 32? With 8 BOINC's configured set to use 12.5% of processors each instance will run 1 thread per GPU and than 2 threads on CPU.

2x8 core with HT so yes, 32 threads that can max at 3400MHz

[Bun-Bun]

Then yeah that's what I would do.

8 Instances of BOINC set to 12.5% of processors for 8 GPU threads per card and 16 CPU threads running whatever else you assign on the wcgrid page.

EDIT:

Should produce 1.6mil WCGPPD

[Movieman]

Then yeah that's what I would do.

8 Instances of BOINC set to 12.5% of processors for 8 GPU threads per card and 16 CPU threads running whatever else you assign on the wcgrid page.

EDIT:

Should produce 1.6mil WCGPPD

ok, TY for the info!

[Bun-Bun]

No problem...

Except you'll have one rig out producing my entire farm

[Movieman]

No problem...

Except you'll have one rig out producing my entire farm

We'll see, the cards have to arrive first and then the hard part, an old fool actually making it work..

[Bun-Bun]

Well if not I have some extra space in my farm room...

[Mydog]

Are there really any gain in running multiple WU's on Nvidia GPU's?
Been testing on one rig today and my conclusion is that there isn't.

Rig consist of a 3960X @4,8GHz
GTX680
GTX480

Running CPU and one thread on each GPU I got these times

GTX 680 average 241 sec
GTX 480 average 210 sec

Running 5 WU's on each GPU and none on the CPU I'm getting this

GTX680 average 14 mins 48 sec
GTX480 average 10 mins 37 sec

Can anyone confirm this or am I doing something wrong?

To clarify what I mean:
Running one WU on a NV GPU + CPU WU's takes 3 mins
Running 5 WU's on a NV GPU takes 15 mins but you loose the points from the CPU WU's as the WU's running on NV also use the CPU at the same time.

[Movieman]

Well if not I have some extra space in my farm room...

and you will continue to have that extra space..

[Bun-Bun]

Are there really any gain in running multiple WU's on Nvidia GPU's?
Been testing on one rig today and my conclusion is that there isn't.

Rig consist of a 3960X @4,8GHz
GTX680
GTX480

Running CPU and one thread on each GPU I got these times

GTX 680 average 241 sec
GTX 480 average 210 sec

Running 5 WU's on each GPU and none on the CPU I'm getting this

GTX680 average 14 mins 48 sec
GTX480 average 10 mins 37 sec

Can anyone confirm this or am I doing something wrong?

According to your numbers you are gaining ~65% by running 5 vs 1.

So yes it is beneficial. But not as much so as ATI. Although once you factor in the lost CPU threads it is not as much beneficial.

Also Nvidia cards are not usable while crunching. Entire system comes to a crawl.

EDIT:

And while crunching ATI seems to generate less heat. My GTX670 ramps up to 1230mhz with boost and hits 60°. My 7950 never budges on temp ~43°C.

[krjalone]

AND YOU! You stay away from my slice..I saw you last night kicking me aside like I was yesterdays old fish!

I only want small slice of the pie and dont worry I have no monsters at my disposal