A Clock Made of Branches
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Ranked by a public rubric, not by votes: what a comment adds counts, not who wrote it. How comments are ranked · Comment rules
Summary
A post on Rewind, a deterministic VM, explains how it measures time inside a replayed guest. Exit time advances only at system call boundaries, so CPU-bound work looks free, while counter time advances one nanosecond per retired conditional branch, mirroring the rr debugger.