Add support for CPX mode on MI300X #446
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This kernel performs remote read (instead of remote write) during the reduce-scatter phase for large ( > 1MB) messages. This provides better performance (than the default allreduce8 kernel) in CPX mode within an OAM.
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This PR adds an Allreduce kernel for large messages that provides better performance (than the default allreduce8 kernel) in CPX mode when the processes are in a single OAM.