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Re:Bus1: a new Linux interprocess communication proposal by pjc50 on Thursday August 18, 2016 @02:12AM (#12310691)
Global message order sounds like the kind of commitment that becomes increasingly expensive in a multi core environment..
Re:Bus1: a new Linux interprocess communication proposal by grandinj on Thursday August 18, 2016 @03:56AM (#12310994)
hence the use of some nifty optimised clocking algorithms:

https://github.com/bus1/bus1/wiki/Message-ordering

Re:Bus1: a new Linux interprocess communication proposal by tomegun on Thursday August 18, 2016 @09:14PM (#12317388)
The overhead due to the message ordering is constant, irrespective of the number of cores/peers. See the link posted above for an explanation.