RFR: 8322732: ForkJoinPool may underutilize cores in async mode

[Viktor Klang]

On Tue, 7 May 2024 22:50:18 GMT, Doug Lea <dl at openjdk.org> wrote:

> This set of changes address causes of poor utilization with small numbers of cores due to overly aggressive contention avoidance. A number of further adjustments were needed to still avoid most contention effects in deployments with large numbers of cores

src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 1432:

> 1430:         final void topLevelExec(ForkJoinTask<?> task, WorkQueue src,
> 1431:                                 int srcBase, int cfg) {
> 1432:             if (task != null && src != null) {

@DougLea Is this ever invoked with a null-task and a null-queue? 🤔

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PR Review Comment: https://git.openjdk.org/jdk/pull/19131#discussion_r1596417799