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/lang/VirtualThread.java line 324:

> 322:         } else {
> 323:             executor.execute(task);
> 324:         }

Is this worth special-casing—IIRC FJP::submit adapts the task if needed already.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26479#discussion_r2267395539