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hiratz's avatar
hiratz
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Does an OpenCL channel have a maximum capacity?

It seems that Intel FPGA's "Programming Guide" does not say there is a maximum capacity for the channel size (FIFO buffer). It just says "__attribute__((depth(N))" can be used to define a depth chann...
HRZ's avatar
HRZ
Icon for Frequent Contributor rankFrequent Contributor
6 years ago

Channels are implemented using register and Block RAMs on the FPGA. The maximum channel size is limited by the amount of such resources available on your FPGA. This is essentially in the order of a few Megabytes. You should not use channels for storing data; they are made for streaming data from one kernel to another.

hiratz's avatar
hiratz
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

I see. Thank you, HRZ!

It looks like that no effective communication optimizations can be used for a large problem size except the global memory.