cancel
Showing results for 
Search instead for 
Did you mean: 

Archives Discussions

afo
Adept I

OpenCL, CAL/IL & MultiGPU

Switching from OpenCL to cal in multigpu (2xHD5970), new issues

hi all,

After switching from OpenCL to CAL/IL to be able to use the 4 GPUs I found an issue related to which GPU is running the kernel:

In my application (single context ,single thread) the GPU to use is a parameter; when I use GPU 0 or 1, my application runs for 55/60 seconds; the same application using the same dataset using GPU 3 or 4 runs for 75/90 seconds. In all cases there is only one GPU running and is the same application running in the same terminal (I am using LinuxX86_64-OpenSuse11.2).

Is there an explanation for this? Has someone seen something similar? Any insight about this will be very appreciated

best regards,

Alfonso

0 Likes
2 Replies

Hi,

Thanks, I had seen that.

Sorry for being pesimistic, but I heard "multigpu will be supported in an upcoming release" since almost one and a half year, so I won't believe in it until I see that working on my system.

By the way, this seems to be solved after the release of the next generation of boards (HD6990), so I have some doubts about multigpu working on nxHD5970, so let's see what happens...

best regards,

Alfonso

0 Likes