The GitHub Actions job "Pull Requests" on pekko.git/perf/onSpinWait-cas-loops has succeeded. Run started by GitHub user He-Pin (triggered by He-Pin).
Head commit for run: cae9d23d770406329f3baabc4c0e0b886e044b3e / 虎鸣 <[email protected]> perf: add Thread.onSpinWait() to CAS spin loops Motivation: CAS retry loops in AbstractDispatcher and Mailbox spin without any CPU hint when contention causes compareAndSet to fail. JDK 9's Thread.onSpinWait() hints to the CPU that we're in a spin-wait loop, improving power efficiency and reducing context-switch latency. Modification: - AbstractDispatcher.scala: add onSpinWait() in shutdown schedule CAS retry loop body - Mailbox.scala: convert setAsScheduled() and setAsIdle() from @tailrec recursive CAS loops to while loops with onSpinWait(), re-reading currentStatus on each retry Result: Better CPU behavior under contention on the message dispatch hot path (setAsScheduled is called on every registerForExecution). The onSpinWait pattern is already established in the codebase (AbstractNodeQueue, AbstractBoundedNodeQueue, AffinityPool). Tests: sbt "actor/compile" — passed References: Refs #3136 Report URL: https://github.com/apache/pekko/actions/runs/28003082873 With regards, GitHub Actions via GitBox --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
