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Can we impose procssor affinity in OpenCl? For example thread# 1 executes on procesor# 5,
thread# 2 executes on procesor# 6, thread# 3 executes on procesor# 7, and so on ?
Thanks
You can’t specify affinity at that low level with OpenCL as far as I know. But, starting with OpenCL 1.2 have some control over affinity by partitioning into subdevices using clCreateSubDevices (possibly with one processor in each subdevice by using
CL_DEVICE_PARTITION_BY_COUNTS, 1) and running separate kernel executions on each subdevice.This would very likely run poorly on anything other than a CPU-based OpenCL implementation, and I’d have to question why you would want to do such a thing. If you want to limit CPU usage for an OpenCL-CPU implementation, you could use
clCreateSubDevicesto portion off some of your computing resources.A PDF describing ‘device fission’ from Intel is here, and it has lots of info on how to use device partitioning and
clCreateSubDeviceseffectively.