RFR: 8306738: Select num workers for safepoint ParallelCleanupTask [v4]

Mon May 8 11:31:25 UTC 2023

On Mon, 8 May 2023 10:36:17 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I like this, thanks!

Rechecked my previous experiment with this new patch. For `java -Xlog:safepoint -Xms1g -Xmx1g -XX:+AlwaysPreTouch -XX:+UseParallelGC Alloc.java`, we get about 50us back!

![plot](https://user-images.githubusercontent.com/1858943/236812357-678274af-dd88-45ed-9b40-e8a222c5ef9a.png)

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PR Comment: https://git.openjdk.org/jdk/pull/13616#issuecomment-1538206572