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Metal - not understanding thread dispatch

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Hello, the workings of dispatchThreadGroups is not clicking for me. I have a tasks that I'd like to add two arrays (each of size 8) together. If I set 4 threads for 2 thread groups, only half of my array is executed. The same if set 8 threads for 1 thread group. I don't understand why I need 2 thread groups of 8 threads each to get all results written. That should result in a segment fault, no?

 

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Edited by knu_revo

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