RFR: 8252842: Extend jmap to support parallel heap dump

[Hamlin Li]

On Thu, 4 Feb 2021 03:52:23 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> BTW, one thing to keep in mind that whatever we do with `dumpheap`, the jcmd version will support fine control over parallelism. So for that reason it wouldn't be so bad to just have `dumpheap` and `inspectheap` always use some default parallelism, and allow tuning it with the jcmd versions. But since the `inspectheap` parallel support already went into 16, that might be hard to undo.

Hi Chris, Lin,
IMHO, 16 is not an LTS, maybe it's better for us to adjust the behavior of jmap -histo in 17 which is LTS? I just filed https://bugs.openjdk.java.net/browse/JDK-8261482.
Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/2261