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[ThomasUCF]

How to use multiple GPU to do calculation

   Hi All:

         The "simpleMultipleDevice" seems wrongly written in the SDK sample, for example, the "input" and "output" is reversed in the kernel.

         Also it seems I can only use GPU[0] to do calculation, someone told me to disable crossfire, I did it , then I can only find two GPUs in my system.(Used to be four).

         Here is my sistem:

         CPU: i7,        Operatiing system: win 7 64 bit

        GPU:  two HD 5970.

      This problem has bothered me for a long time, any explanations on this?

  Thanks a lot.

  ThomasUCF

[nou]

this is bug in the driver. they are working to fix it.

[himanshu_gautam]

hi thomas_UCF,

As of now, AMD does not support the other devices except deice[0] of your gpu for computation purposes.

So for now, you can do computation only only on the device[0] of both your GPUs.

And thanks for reporting the bug in the sample.Its great help.

[ThomasUCF]

Hi Himanshu:

   Thanks, your comments are also great help to me.

Thomas

[ThomasUCF]

Hi himanshu:

   I use the device[0] on both of my 5970s, do I have to use Linux system?

When I turn off the corssfire and remove the ribbon which connect the two GPUs, if I attach screen to one GPU, the device information says I only have two GPUs, when I attach screen to both GPUs, the sample code can not run.

 So I do I use both of the device[0] in windows system?

Thanks a lot.

ThomasUCF

[himanshu_gautam]

Hi thomasUCF,

AFAIK, device[0] of both GPUs should run in windows.Which sample code are you running.Are you using latest sdk and drivers?

[ThomasUCF]

  Thank you. Can you tell me approximately how long will the bug be solved?