[ http://jira.jboss.com/jira/browse/JBAS-1274?page=history ]
Scott M Stark updated JBAS-1274:
--------------------------------
Priority: Minor (was: Major)
> Excessive Use Of Memory under no-load conditions after install with -All
> option
> -------------------------------------------------------------------------------
>
> Key: JBAS-1274
> URL: http://jira.jboss.com/jira/browse/JBAS-1274
> Project: JBoss Application Server
> Type: Bug
> Versions: JBossAS-4.0.1 Final
> Environment: Jboss 4.0.1 Final WindowsXP JDK 1.5.0_01
> Reporter: aanecito
> Assignee: Scott M Stark
> Priority: Minor
>
>
> I was up late last night looking at JBoss 4.0.1 Final. I was using 1.5.0_01
> JDK from Sun and noticed something interesting. I used the VisualGC tool to
> dynamically look at the heap and it has a cool multi-window GUI. One of the
> windows shows the New-Old heap space. What was interesting was the behavior I
> call motorboating where the New generation heap gets filled up and does a
> minor GC and puts objects into the survivor spaces. The interesting thing was
> I had the new generation size around 30MB and it filled it very quickly after
> starting it up and nothing hitting the server in the ?All configuration. On
> the window it looked like a sawtooth waveform and it looked as if the objects
> were all GC?ed but I was wondering why the server was creating so many
> objects so quickly using up valuable resources with zero load.
> I also noticed a system.gc every now and then which makes me believe someone
> should do a search through all the source to eleminate this call. It it not
> good to overide the JVM for GC's. I also was getting invalid allocations
> indicated in the VisualGC tool. All this just after installing JBoss 4.0.1
> Final out of the box so to speak.
> I also noticed this same behavior in JBoss 3.5.2 so I suspect it may be a
> generic issue with Jboss product. Please let me know what I can do about it.
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