RFR: 8360046: Scalability issue when submitting virtual threads with almost empty tasks [v5]

[Viktor Klang]

On Thu, 7 Aug 2025 14:03:40 GMT, Doug Lea <dl at openjdk.org> wrote:

>> This set of updates reduces contention-based performance loss under heavy over-subscription, while also improving perfomance more generally.
>
> Doug Lea has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Avoid underutilization on resize

src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 1860:

> 1858:             phase != 0 && w != null && w.source != DROPPED) {
> 1859:             w.cancelTasks();               // clean queue
> 1860:             signalWork(null, 0);           // possibly replace

@DougLea Nice catch 👍

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PR Review Comment: https://git.openjdk.org/jdk/pull/26479#discussion_r2272669251