RFR: 8292969: Bad Thread Utilization in ForkJoinPool
Aleksey Shipilev
shade at openjdk.org
Mon Sep 26 13:34:27 UTC 2022
On Mon, 26 Sep 2022 13:29:51 GMT, Doug Lea <dl at openjdk.org> wrote:
>> src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 1842:
>>
>>> 1840: signalWork(); // propagate at most twice/run
>>> 1841: w.topLevelExec(t, q);
>>> 1842: return src + (prevSrc << SWIDTH);
>>
>> Are all of these values (`src`, `prevSrc`) less or equal `0x7FFF`? Otherwise we are playing with sign bits here.
>
> Yes, see the discussions around line 391 of internal docs.
Ah, all right then.
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PR: https://git.openjdk.org/jdk/pull/10198
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