2 Replies Latest reply on Mar 17, 2011 10:51 AM by afo

    OpenCL, CAL/IL & MultiGPU

    afo
      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