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https://issues.apache.org/jira/browse/GEODE-7483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16978782#comment-16978782
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Alex Dubrouski commented on GEODE-7483:
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Could you please clarify? You said benchmark supports ShenandoahGC (I currently
use it), but test flag *-PwithGc=Z* implies ZGC, which is not fully supported
judging by that error in log.
Overall, the problem with ShenandoahGC in this case is that it processes weak
references during STW, thus key eviction spikes cause ~1s pauses (outliers).
Thanks
> Add support for new Oracle ZGC garbage collector
> ------------------------------------------------
>
> Key: GEODE-7483
> URL: https://issues.apache.org/jira/browse/GEODE-7483
> Project: Geode
> Issue Type: Improvement
> Components: client/server
> Reporter: Alex Dubrouski
> Priority: Major
>
> Good afternoon,
> We have a POC Geode cluster and few regions have pretty short TTLs for keys,
> thus sometimes we experience spikes in garbage collection pauses due to
> eviction of large amount of weak references. I tried to switch cluster to
> Oracle new ZGC (it supposed to process weak roots concurrently, so
> theoretically there will be trade off long pauses for CPU usage spikes), but
> I am getting this error when starting a server:
> {code:java}
> [error 2019/11/20 13:01:58.302 PST <main> tid=0x1] No tenured pools found.
> Known pools are: [(Name=CodeHeap 'non-nmethods';Type=Non-heap
> memory;UsageThresholdSupported=true), (Name=Metaspace;Type=Non-heap
> memory;UsageThresholdSupported=true), (Name=ZHeap;Type=Heap
> memory;UsageThresholdSupported=true), (Name=CodeHeap 'profiled
> nmethods';Type=Non-heap memory;UsageThresholdSupported=true), (Name=CodeHeap
> 'non-profiled nmethods';Type=Non-heap memory;UsageThresholdSupported=true)]
> {code}
> (OpenJDK v13.0.1)
> Could you please implement support for new generation of low pause garbage
> collectors?
> Thanks.
>
> Regards,
> Alex Dubrouski
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