[Discuss] backport - parallel heap inspection for different GC Heap(Internet mail)

linzang(臧琳) linzang at tencent.com
Mon Apr 26 11:10:16 UTC 2021

Dear All, 
  Sorry that we delayed this too much! Recently we have implemented the
parallel heap inspection support for CMS in JDK11.
  Bin(Buddy) and I will start with backport to JDK11u, and we are
planning support parallelScavenge, CMS, G1.


On Thu, 2020-11-12 at 16:05 +0000, Hohensee, Paul wrote:
> You mean 15u, not 14u, right? Because 14u is an orphan release afaik.
> I'm ok with adding "parallel" as a jmap command line option. It's
> purely additive, and so doesn't break existing code. You'll need
> backport CSRs, and you'll definitely have to add 11u CMS support.
> Thanks,
> Paul
> On 11/12/20, 2:42 AM, "jdk-updates-dev on behalf of linzang(臧琳)" <
> jdk-updates-dev-retn at openjdk.java.net on behalf of 
> linzang at tencent.com> wrote:
>     Dear All,
>          Recently I have made an enhancement that inspect heap
> parallelly for different GC heap (PSS, G1, Shenandoah and Z) and the
> patches have been pushed to jdk master. The result show significant
> speedup of “jmap -histo”.
>          I am planing to backport them to jdk14u and jdk11u, and also
> add CMS Support if needed, but I want to know whether it will be
> accept before starting the real work, because it add “parallel”
> option to jmap command, which may affect compatibility.
>          May I ask your opinion about it? Thanks.
>          FYI. The original bug: 
> https://bugs.openjdk.java.net/browse/JDK-8214535
>     BRs,
>     Lin

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