Whether you like it or not, RDTSC counts wall-clock time not clock ticks. Has been for a long time. (Same goes for AMD.)pic.twitter.com/o2yHHhlMA7
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When atomics can synchronize memory across cores within a few tens of cycles, "within a few hundred" is not sufficient for monotonicity.
In that case you could get an observably A-before-B relationship with rdtsc@A > rdtsc@B.
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