Three things I'd do (in this order):
1) Find out if it's the container the serving the empty response or
your application (should be very simple to find out - if you can't
tell otherwise for sure, just make a little identifiable change in
your template and see it that's what you get back). As said, I highly
doubt that you are getting a "bare layout".
2) You indicated that only 40% of memory is used. From the looks of
it, I'd say you are hitting a JVM OoM. It happens relatively easily
with 5.1 with a moderate load and tight max memory limit. You have way
more memory on the system available - allocate e.g. -Xmx3072 and see
what happens. If OoM is the issue, you should be able to handle
roughly double the requests.
3) Find the right memory limits and tweak GC settings. The trick is to
find the right limits for the platform. If you allocate too much, the
OS oom killer will step in (assuming you are on Xnix platform) - again
happens fairly easily especially on virtualized platforms (since
there's no swap) near the memory limits even if it seems that there's
free memory available.

Kalle


On Wed, Nov 24, 2010 at 2:14 AM, dennisdeo81 <dennis....@rockshore.net> wrote:
>
> Hi Kalle,
>
> Below are my Java Memory Arguments for weblogic:
>
> -server -Xms1536m -Xmx1536m -XX:NewSize=512m -XX:MaxNewSize=512m
> -XX:PermSize=256m -XX:MaxPermSize=512m -XX:+UseParallelGC
> -XX:SurvivorRatio=3
> -XX:+UseCompressedOops -XX:+PrintGCDetails -XX:+PrintTenuringDistribution
> -verbose:gc -XX:+DisableExplicitGC
> -Xloggc:/var/applogs/weblogic/vmb-um/managed1/gc_pipe -Xverify:none
> -Dmanaged1 -Dvmb-um -Djava.awt.headless=true
> -Djavax.xml.stream.XMLInputFactory=weblogic.xml.stax.XMLStreamInputFactory
>
>
> --
> View this message in context: 
> http://tapestry.1045711.n5.nabble.com/T5-page-request-return-blank-layout-under-heavy-load-test-tp3277134p3278183.html
> Sent from the Tapestry - User mailing list archive at Nabble.com.
>
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