[jboss-jira] [JBoss JIRA] (WFLY-9456) High non heap memory consumption

[James Perkins (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-9456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13479618#comment-13479618 ] 

James Perkins commented on WFLY-9456:
-------------------------------------

I'm not sure this is the issue, but there was a bug with OpenJDK 1.8.0_144-b01 where large memory consumption was an issue. On Fedora there was a fix for it earlier this week I believe.

For me on Fedora with the latest OpenJDK I get the following:

{code:title=WildFly 11.0.0.CR1}
jperkins 13639  9.3  0.8 6366512 287328 pts/9  Sl+  13:23   0:08 java -D[Standalone] -server -Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m
{code}
{code:title=WildFly 10.1.0.Final}
jperkins 14634  172  0.9 6394860 295060 pts/9  Sl+  13:29   0:08 java -D[Standalone] -server -Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m
{code}

> High non heap memory consumption
> --------------------------------
>
>                 Key: WFLY-9456
>                 URL: https://issues.jboss.org/browse/WFLY-9456
>             Project: WildFly
>          Issue Type: Bug
>          Components: Class Loading
>    Affects Versions: 11.0.0.CR1
>         Environment: CentOS 7 on Google compute engine VM
> openjdk version "1.8.0_144"
> OpenJDK Runtime Environment (build 1.8.0_144-b01)
> OpenJDK 64-Bit Server VM (build 25.144-b01, mixed mode)
>            Reporter: Klaus Erber
>            Assignee: David Lloyd
>         Attachments: wf10-nmt.txt, wf11-nmt.txt
>
>
> After a clean install of WF11CR1 without any configuration changes and startup with standalone.sh we see a high memory usage on the system side (about 800 MB).
> Wenn we do the same with WF10Final we see a memory usage of about 210 MB.
> Her are the output auf ps aux:
> wf11
> ke4       1652 14.0 22.1 2863404 *801620* pts/3  Sl+  14:01   0:07 java -D[Standalone] -server -Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m 
> wf10
> ke4       1836 42.1  5.7 2687744 *209204* pts/2  Sl+  14:02   0:06 java -D[Standalone] -server -Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m
> The result is, that we can only start 3 instances of wildfly 11 on a 3.75 GB VM. The 4th instance crashes the system. In our real scenario (Wildfly instances in docker containers hosting the REST interface for our application) we see about 1 GB memory consumption per backend node.
> The heap and other memory pools not seems to be the reason for this behaviour - see the attached native memory tracking results.



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