Forum > GPU crunching
Modified SETI MB CUDA + opt AP package for full GPU utilization
sunu:
Right now there are zero AP workunits. We wait for new data from Arecibo.
Since the other projects don't have an app_info.xml, you'll have to play with cc_config.xml.
For SETI you can play with app_info.xml. The file you've attached will run 4+1 AP+MB without any modification to cc_config.xml.
Raistmer:
--- Quote from: sunu on 29 Jan 2009, 08:54:09 pm ---Regarding more is better than 1 core empty I think it is wrong. These optimized apps have special optimization for cache usage and when you have two apps, especially from different projects, sharing a core you will have degraded performance overall with all these cache misses or whatever. On the other hand you will always have some seti cuda or GPUGRID tasks to crunch more or less. On those rare circumstances that you will not, you can use the cc_config.xml trick.
--- End quote ---
Hm, you could give some more trust to my words ;) I'm aware about AK v8 optimizations and participate in AK v8 benchmarking pretty long time already. And being one of direct developers of AP opt app too, btw, surely aware about its interaction with cache.Core switching will give much less performance degradation then just leaving full core idle. I don't know what is done in Linux build that it requires 100% CPU usage (and even not sure that it's so indeed), but this thread about Windows app, moreover, about modification that allows to use whole cores. And you give suggestion to leave one core free ?? If you need free core, don't use this mod at first, this mod designed to use ALL cores AND GPU.
chelski:
Thanks Raistmer for the wonderful V7 app. Have been running it fine for about 1 week now on a "weakling" 9600GSO and apparently its thoughput is about 1.5x my Core2Duo E6550 running AK optimised aps.
Just noticed there are some glitches when the app completes one unit and change to another one, on some occasions, ~0.8x per day will see that task stuck there for hours at 0:00:01 CPU times (in my case the CUDA apps neeeds about 30 secs CPU time to prepare the WU for CUDA) for hours and only way to restart it is to restart the client, at which point that WU will normally work out fine. Tried limiting CPU usage to 95% ( to leave a few % for CUDA WU switching) but somehow it doesn't work. It is just a small inconvenience that some babysitting for BOINC is required (i generally check 2-3 times a day to restart if required) but any suggestion for other workaround would be great. And again thanks for the great effort on the CUDA app!
Raistmer:
--- Quote from: chelski on 01 Feb 2009, 10:59:11 am ---Thanks Raistmer for the wonderful V7 app. Have been running it fine for about 1 week now on a "weakling" 9600GSO and apparently its thoughput is about 1.5x my Core2Duo E6550 running AK optimised aps.
Just noticed there are some glitches when the app completes one unit and change to another one, on some occasions, ~0.8x per day will see that task stuck there for hours at 0:00:01 CPU times (in my case the CUDA apps neeeds about 30 secs CPU time to prepare the WU for CUDA) for hours and only way to restart it is to restart the client, at which point that WU will normally work out fine. Tried limiting CPU usage to 95% ( to leave a few % for CUDA WU switching) but somehow it doesn't work. It is just a small inconvenience that some babysitting for BOINC is required (i generally check 2-3 times a day to restart if required) but any suggestion for other workaround would be great. And again thanks for the great effort on the CUDA app!
--- End quote ---
Sorry, can't suggest anything but to use some monitoring tool like Maik's script or smth like that to restart hung tasks. Unfortunately (in this context) my own 9600GSO seems doesn't have such problems so I can't reproduce this behavior.... If you can catch hang tasks and attach them here I could try to re-run it on my host in standalone mode - maybe I meet that hang too? ...
seeker98tw:
Hi
computer:
AMD Phenom(tm) 9650 Quad-Core Processor
and 9600GT Graph-CARD
Can I use 'package_V7' ? Is it working ?
thanks
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