Associate OpenCL device with NVAPI device

Question

I am trying to associate the OpenCL GPU devices with NVAPI devices which I get using NvAPI_EnumPhysicalGPUs in the Multi-GPU system.

The thing is, I can use clGetDeviceInfo with CL_DEVICE_VENDOR_ID which is always unique and it is the best way, and I can retrieve the vendor from the NvAPI_SYS_GetChipSetInfo. But it is not associated with the NvPhysicalGpuHandle which I get from NvAPI_EnumPhysicalGPUs. Is there any way to associate this?

Of course, I can just use name, but this is not good.

@ParkYoung-Bae i can use this on NVAPI side sure, but how do i get the Bus id in OpenCL? `clGetDeviceInfo` doesn't seem to have any definition to return the bus id in the documentation page. — Vanya, Nov 25 '14 at 16:08

score 0 · Accepted Answer · answered Dec 07 '14 at 05:06

There is a way to do it. In OpenCL there is a poor documented feature for some reason. You need to call clGetDeviceInfo with constant 0x4008 and it will give you the bus id for the following device handle.

cl_uint busID;
clGetDeviceInfo(device,0x4008,sizeof(cl_uint), &busID,NULL);
printf("%d",busID);

On NvApi side use NvAPI_GPU_GetBusId. Then you can associate the handles by comapring the buses.

Associate OpenCL device with NVAPI device

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