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Does anyone use multi gpu on one machine on linux?

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guildwar:
I have a machine with one cuda device, and run setiathome CUDA for linux perfectly

Recently, I plug another cuda device which the same with the previous one
when run boinc, it say I have two cuda device, so far so good
but I notice,  the job's cpu time is not the same, from about 300 seconds to  1600 seconds
284.96     13.79     13.79
to
1,640.06     13.79     13.79

and after check, I found setiathome use cpu instead of gpu to crunch  the workunit

ps ax|grep seti
4311 pts/1    RNLl   9:42 setiathome-CUDA-6.08.x86_64-pc-linux-gnu --device 0
4312 pts/1    RNLl   9:42 setiathome-CUDA-6.08.x86_64-pc-linux-gnu --device 0

two setiathome cuda use the same gpu
so, I change app_info.xml
<coproc>
<type>CUDA</type>
<count>2</count>
</coproc>
and restart boinc

ps ax | grep seti
4423 pts/1    RNLl   9:45 setiathome-CUDA-6.08.x86_64-pc-linux-gnu --device 0 --device 1

only show one instence of setiathome cuda, but whith two devices

but after I check result, the cpu time and walltime is the same with only one gpu
can somebody tell me why?

Raistmer:
Singlu CUDA MB instance can use only one GPU device.
That is, you need run one copy with device 0 and second with device 1.
Not both with device 0 and not single with two devices.

guildwar:

--- Quote from: Raistmer on 22 Mar 2009, 01:53:47 pm ---Singlu CUDA MB instance can use only one GPU device.
That is, you need run one copy with device 0 and second with device 1.
Not both with device 0 and not single with two devices.


--- End quote ---

Thanks for your reply
But I don't know how to use two instence of MB cuda
How to write app_info.xml?

Metod, S56RKO:

--- Quote from: guildwar on 22 Mar 2009, 02:01:59 pm ---
--- Quote from: Raistmer on 22 Mar 2009, 01:53:47 pm ---Singlu CUDA MB instance can use only one GPU device.
That is, you need run one copy with device 0 and second with device 1.
Not both with device 0 and not single with two devices.


--- End quote ---

Thanks for your reply
But I don't know how to use two instence of MB cuda
How to write app_info.xml?

--- End quote ---

Any idea? I've got a dual-GPU GF9800 GX2 and I'm wondering if I can make it play nice ...

sunu:

--- Quote from: Metod, S56RKO on 08 Jul 2009, 05:11:21 am ---Any idea? I've got a dual-GPU GF9800 GX2 and I'm wondering if I can make it play nice ...

--- End quote ---

Have you tried it? What problems  do you have?

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