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Altera_Forum
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9 years ago

get_global_id(0) cause much latency ?

Hi I'm trying to compare the performance of FPGA and GPU based on image processing algorithm. I've found that there's a 10ms different when using the get_global_id(0) and not using it. The kernel ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Are you launching this as a single work-item kernel or as an NDRange kernel? Since you're using get_global_id (or trying to), I presume NDRange. Maybe the design would work better as a single work item kernel. Some code (from the host and kernel) might help to explain.