[jboss-jira] [JBoss JIRA] (WFLY-4617) Huge garbage created at regular intervals in Wildfly 8.2.0.Final

[Srivathsan Agaram Venkatavaradhan (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-4617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083180#comment-13083180 ] 

Srivathsan Agaram Venkatavaradhan commented on WFLY-4617:
---------------------------------------------------------

It appears that there is no issue with wildfly as such.  Performance is in par with JBoss 7.1.1 now. We fixed issue with home grown code and performance improved by enabling and increasing stateless session bean pool size to 500.

> Huge garbage created at regular intervals in Wildfly 8.2.0.Final
> ----------------------------------------------------------------
>
>                 Key: WFLY-4617
>                 URL: https://issues.jboss.org/browse/WFLY-4617
>             Project: WildFly
>          Issue Type: Bug
>    Affects Versions: 8.2.0.Final
>         Environment: Centos 7, JDK 7
>            Reporter: Srivathsan Agaram Venkatavaradhan
>            Assignee: Stuart Douglas
>              Labels: 8.2.0.Final, gc, undertow, wildfly
>         Attachments: Char Array Incoming reference, Char Array Retained Objects, Heap Histogram View, merge paths - ArtifactDetailList, newheap1_Leak_Suspects.zip, Overall Heap, Overall Memory Usages
>
>
> Huge garbage is created in wildfly every couple of minutes. Though Full GC is able to reclaim memory, this causes frequent full gcs, as heap is getting occupied due to the increase in number of objects created . We can reproduce this issue in 60 users Jmeter loadtest. This was not the case in Jboss 7.1.1Final. 
> After analyzing heapdumps,   Huge char arrays are created and they are not garbage collected by Minor GC.  Incoming reference for the char array suggest that they have valid reference to io.undertow.servlet.spec.HttpServletRequestImpl. However full gc is able to recover the memory. Not sure why attributes in  io.undertow.servlet.spec.HttpServletRequestImpl are not getting gced by minor gc's.
> "org.apache.struts.tiles.ComponentContext"  is kept in  attributes Map by io.undertow.servlet.spec.HttpServletRequestImpl.  org.apache.struts.tiles.ComponentContext contains a big char array.
> We suspect issue with undertow.



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