Forum > GPU crunching

Multiple WU's per GPU

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Raistmer:
more precisely, older GPU can benefit from multiple tasks running only if there are big enough periods of idle GPU through app execution. Such idle period should be long enough to offset switching cost.
If not, running few instances per GPU will be counterproductive because of switching overhead.

Pepi:
Just to to say ( confirm) that GTX 460  can work three WU  in same time. On average after 33 minutes got three results. 

Frizz:

--- Quote from: Raistmer on 10 Dec 2010, 01:20:14 pm ---more precisely, older GPU can benefit from multiple tasks running only if there are big enough periods of idle GPU through app execution. Such idle period should be long enough to offset switching cost.

--- End quote ---

Astropulse OpenCL version for example benefits a lot when running multiple tasks. Check out my findings here: http://setiathome.berkeley.edu/forum_thread.php?id=62385&nowrap=true#1057180

Pepi:
multibeam WU
I have 5670 and 5770. And both cannot run 2 WU in same time: Boinc show normal progress for first WU and no progress from second WU, But when first WU is finished then second starts. Can you help me
5670 has 512 MB ram
5770 has 1024 MB ram
so I think they have enough memory to process wu. And they are so slow compared to cuda...

Claggy:

--- Quote from: Pepi on 23 Dec 2010, 06:18:59 am ---multibeam WU
I have 5670 and 5770. And both cannot run 2 WU in same time: Boinc show normal progress for first WU and no progress from second WU, But when first WU is finished then second starts. Can you help me
5670 has 512 MB ram
5770 has 1024 MB ram
so I think they have enough memory to process wu. And they are so slow compared to cuda...

--- End quote ---
you do have -instances_per_device 2 set in your app_info don't you?

Claggy

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