[jboss-jira] [JBoss JIRA] Commented: (JGRP-1180) OutOfMemoryError

[Peter Kormos (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12523311#action_12523311 ] 

Peter Kormos commented on JGRP-1180:
------------------------------------

{quote}
8 MB of heap, you gotta be kidding ?
{quote}

I wanted to let the program crash soon and not to "wait forever"

As  I wrote - even with 8M heap - the program doesn't always crash. Let's say, 2 times out of 3 it doesn't but it's completely unpredictable.  But no matter what the heap size is, what about the number of message instances in memory?

> OutOfMemoryError
> ----------------
>
>                 Key: JGRP-1180
>                 URL: https://jira.jboss.org/jira/browse/JGRP-1180
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.8
>         Environment: 2.8.0.GA
>            Reporter: Peter Kormos
>            Assignee: Bela Ban
>
> Hi Guys,
> I wrote a simple program.
> public testbed() throws Exception
>   {
>     JChannel channel = new JChannel();
>     channel.connect("channelName");
>     for (int i = 0; i < 100000000; i++)
>     {
>       Message msg = new Message(
>           null,
>           null,
>           "Test");
>       channel.send(msg);
>       // Thread.sleep(10);
>       if (i % 1000 == 0)
>         System.out.print(".");
>     }
> }
> When I run it with 
> java -Xmx8m -XX:+HeapDumpOnOutOfMemoryError -cp .;jgroups-all.jar  testbed
> not always, but quite often it dies with OutOfMemoryError
> When I look at the heap dump with jhat, for "Instance Counts" it tells me 
> 22036 instances of class org.jgroups.Message 
> 22036 instances of class org.jgroups.protocols.pbcast.NakAckHeader 
> 22036 instances of class org.jgroups.util.Headers 
> 21316 instances of class org.jgroups.Event 
> 21314 instances of class org.jgroups.util.Queue$Element 
> 304 instances of class org.jgroups.util.UUID 
> Why are there so many message objects stuck in memory?
> java org.jgroups.Version prints
> Version:      2.8.0.GA
> CVS:          $Id: Version.java,v 1.81 2009/12/01 10:31:13 belaban Exp $
> I'm using Windows Xp with 1.6 JDK

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