Poem new GPU app update

[myshortpencil]

I removed and reinstalled Poem in a Win7, x64, AMD A8-3870k, XFX 6870 system with app_config set to 1 CPU for every 0.5 GPU. 1 WU ran for 18,000 seconds, completed and validated. 31,200 credits a day compared to over 250,000 a day on the retired project. (The computer was running other CPU projects plus being used for Internet surfing and youtube watching).

FYI, the 6870 is a single precision card and the 7790 is double precision.

[zombie67]

Now this is odd!

Running 3 at a time on the TITAN:

Task run time = 6,900 seconds. That works out to ~243k/day. So 3 is better than 4. But how is 3 faster per task than 2???. I think I may have run that 2-per set with CPU tasks also running. I think I will try re-sunning 2-per w/o CPU tasks, to get apples to apples comparison.

Running 2 at a time on the TITAN, this time without any CPU tasks running:

Task run time = 5,500 seconds. That works out to ~202k/day. So 3 is the best.

In comparison, running with 2 GPU tasks 1 full thread each AND filling up the remaining threads with CPU tasks was 133k/day. That is a SIGNIFICANT hit to production. Now I need to run some more tests to see if I can run some number of CPU tasks before the slow down kicks in.

[zombie67]

Hey I have an A8-3870k/7790 system too! I've errored a few and completed a couple. I'm backing off for now until the project team gets the erroring under control.
http://boinc.fzk.de/poem/results.php?hostid=153998

I think I may know what's going on. Are your tasks being suspended at all? Like maybe they are suspending when you use the keyboard? Or running benchmarks, or rebooting? These tasks seem to very sensitive to that kind of stuff. Mine sometimes error out when just changing the number of GPUs in the app_config.xml. Maybe by not changing anything, or doing anything that causes the tasks to suspend at all, you can get them to complete?

[John P. Myers]

Running 2 at a time on the TITAN, this time without any CPU tasks running:

Task run time = 5,500 seconds. That works out to ~202k/day. So 3 is the best.

In comparison, running with 2 GPU tasks 1 full thread each AND filling up the remaining threads with CPU tasks was 133k/day. That is a SIGNIFICANT hit to production. Now I need to run some more tests to see if I can run some number of CPU tasks before the slow down kicks in.

Just a guess, but i'm gonna say the slowdown begins at the point where the number of cores used by the GPUs, plus the number of cores used by CPU WUs exceeds the number of cores the CPU has, either pushing the GPU tasks to a HT thread, or trying to cram it together on the same core/thread as a CPU WU.

[myshortpencil]

I think I may know what's going on. Are your tasks being suspended at all? Like maybe they are suspending when you use the keyboard? Or running benchmarks, or rebooting? These tasks seem to very sensitive to that kind of stuff. Mine sometimes error out when just changing the number of GPUs in the app_config.xml. Maybe by not changing anything, or doing anything that causes the tasks to suspend at all, you can get them to complete?

My A8-3870k/7790 system is a dedicated cruncher. Crunched straight through without interruption and errored. Two more guesses left.

BUT WAIT!!!!! I have Collatz GPU tasks on that machine, too, and Boinc may have switched between POEM and Collatz. I'm running another POEM on the same machine and suspended Collatz. Please stay tuned.

(Leave applications in memory while suspended is enabled).

I also note that my A8-3870k/6870 had Collatz and POEM GPU tasks, and it was being used for surfing, youtubing, Excelling, NotePadding, and Doc-ing, all while POEM was running and the WU completed and validated. It was also running Ibercivis at the same time.

[myshortpencil]

My A8-3870k/7790 WU erred again. No interruption of crunch. It was only 65% through the crunch at 7160 seconds. Using BM 7.2.33. Will try 7.2.42

[myshortpencil]

My A8-3870k/7790 WU erred a third time. No interruption of crunch. Using BM 7.2.42. No success on this card. It has OpenCL but no CAL.

[conf]

tried this one ?

http://developer.amd.com/tools-and-s...ssing-app-sdk/

They used those things years ago and I read something recently that it could be useful for the new ones too.

[c303a]

I tried running the poem app on my gtx 570 and everyone errored out. Went back to gpu grid.

[myshortpencil]

tried this one ?

http://developer.amd.com/tools-and-s...ssing-app-sdk/

They used those things years ago and I read something recently that it could be useful for the new ones too.

Thanks, conf. Love your new avatar. Maybe Four-Oh will give this a try. I just try things and if they don't work, I move on. Lots of projects do work well without fussing.