BTW, where do we store Mark stack data? off-heap? Thanks, Roy On Sun, Apr 24, 2022 at 8:28 AM Roy Zhang <roy.sunny.zhang007@gmail.com> wrote:

Dear Erik,

Thanks for ur quick reply! The heap size is 650G, it is a huge application. So what should we do? Reduce heap size? Use G1GC or Shenandoah GC?

Regarding JDK17, unfortunately, we have to stuck on JDK11 for some time...

Thanks, Roy

On Sun, Apr 24, 2022 at 2:49 AM Erik Osterlund <erik.osterlund@oracle.com> wrote:

...

Hi Roy,

I wonder how large is the heap size? I also wonder if you had the chance to try JDK 17? Quite a few things have changed in this area since 11.

Thanks, /Erik

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On 23 Apr 2022, at 13:45, Roy Zhang <roy.sunny.zhang007@gmail.com> wrote:

Dear ZGC experts,

Currently we have JVM crash issue caused by Mark stack overflow, and need to increase ZMarkStacksMax (default value is 8G), but even if I increase it to 16G (or even 24G), we still have this issue.

1. Could u please kindly let me know how to troubleshoot the Mark stack overflow issue? Is it caused by too many live objects? 2. If I have to stuck on JDK11(as we know, ZMarkStacksMax is deprecated in JDK12 via dynamic base address for mark stack space), will it help if we switch to G1GC or Shenandoah GC?

Really appreciate ur great help!

Thanks, Roy