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wwood10's avatar
wwood10
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7 years ago

[FPGA SDK for OpenCL] Problem with setting multiple compute units

I have recently been trying to compile an NDRange kernel with 4 compute units (by using the num_compute_units attribute), however when I view the report it says that the number of compute units is 1....
shubham10's avatar
shubham10
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4 years ago

Hi,

Is there any way by which we can get/request more than one physical compute unit on the underlying FPGA chip (say S10PAC)?

Thanks

HRZ's avatar
HRZ
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4 years ago

What exactly are you trying to achieve by that? An FPGA design is not fixed and the underlying FPGA architecture does not have any notion of a "compute unit"; "compute unit" is simply an OpenCL terminology which doesn't necessarily map to anything meaningful on an FPGA.

You can always compile and synthesize multiple kernels into one bitstream and run them in parallel in different queues, if that is what you are trying to achieve. There are also ways to automatically create/duplicate compute units in both Single Work-item and NDRange kernels.