Selecting device

Accelerated Computing HPC Compilers Legacy PGI Compilers
1

Hi,

I have access to a machine that has two GPU’s. I thought that if I run two processes then they would automatically select different GPU’s. But that is not happening. Do we have to make the code select the GPU every time?

2

Do we have to make the code select the GPU every time?

Yes. The run time has no way of knowing how many running processes might use a GPU, hence, the user needs to select the device. Otherwise, the default device is used.

  • Mat
3

Thanks Mat.

Actually I wanted something like this. I only found this now.

http://stackoverflow.com/questions/33092509/pgi-openacc-target-specific-gpu-device
4

Ok. That’s what I mean by user selected. Either a environment variable is set or the device is selected in the code via a call to the runtime.