RFR: 8322732: ForkJoinPool may underutilize cores in async mode

[Doug Lea]

On Fri, 10 May 2024 11:44:14 GMT, Doug Lea <dl at openjdk.org> wrote:

>> src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 1412:
>> 
>>> 1410:                         if (stalled)
>>> 1411:                             Thread.onSpinWait();
>>> 1412:                         stalled = true;
>> 
>> @DougLea Performance-wise, does it make any difference to make the write to `stalled` in an `else-branch` to avoid writing it every time beyond the initial?
>
> This doesn't matter performance-wise but I agree that it looks unnecessarily odd so will change.

Or better (wrt this and previous comment): make the code-shape of poll() the same as inner loop of scan(). Done.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19131#discussion_r1596772902