Hi All,
we want to rollout a Tapestry app very shortly, but we struggle with
load testing issues. We are currently load testing on one Tomcat 6.0.32:
- 500 worker threads, tapestry.production-mode=true
- Intel(R) Xeon(R) CPU X7460 @ 2.66GHz
- OpenJDK Runtime Environment (IcedTea6 1.7.10)
(rhel-1.20.b17.el5-x86_64) OpenJDK 64-Bit Server VM (build 14.0-b16,
mixed mode))
and 2 loadrunner test clients.
After ramping up the concurrent requests (about 5min) we reach the
maximum at about 450req/sec and get server busy errors. We see a high
thread contention on InternalComponentResourcesImpl.postRenderCleanup
currently with the Loop component, as there 10 Loop on the Index page.
Is there a workaround possible without removing the Loop component from
the page to increase the throughput? The thread dumps series looks like
this: 1 thread locks 0x00000000e3858990 and over 400 threads are
waiting. This lock is persistent over a thread dumps series. I guess the
private synchronized Map<String, Object> getRenderVariables(boolean
create) call hits us.
"http-9080-188" daemon prio=10 tid=0x000000004d463000 nid=0x382a
runnable [0x0000000055b2f000]
java.lang.Thread.State: RUNNABLE
at
org.apache.tapestry5.internal.transform.ParameterWorker$3$1.getState(ParameterWorker.java:206)
at
org.apache.tapestry5.internal.transform.ParameterWorker$3$1.reset(ParameterWorker.java:302)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.work(InternalComponentResourcesImpl.java:136)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.work(InternalComponentResourcesImpl.java:133)
at
org.apache.tapestry5.internal.util.NamedSet.eachValue(NamedSet.java:171)
- locked <0x00000000e3858990> (a
org.apache.tapestry5.internal.util.NamedSet)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.resetParameterConduits(InternalComponentResourcesImpl.java:546)
- locked <0x00000000e385c038> (a
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.postRenderCleanup(InternalComponentResourcesImpl.java:522)
at
org.apache.tapestry5.corelib.components.Loop.postRenderCleanup(Loop.java)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$1.run(ComponentPageElementImpl.java:85)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:956)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$1800(ComponentPageElementImpl.java:61)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$PostRenderCleanupPhase.render(ComponentPageElementImpl.java:443)
at
org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72)
at
org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:124)
at $PageRenderQueue_135675e1f6b934.render(Unknown Source)
at $PageRenderQueue_135675e1f6b933.render(Unknown Source)
at
org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37)
...
"http-9080-499" daemon prio=10 tid=0x000000004dffb000 nid=0x3b7d waiting
for monitor entry [0x0000000069063000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.getRenderVariables(InternalComponentResourcesImpl.java:476)
- waiting to lock <0x00000000e385c038> (a
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.postRenderCleanup(InternalComponentResourcesImpl.java:517)
at
org.apache.tapestry5.corelib.components.Loop.postRenderCleanup(Loop.java)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$1.run(ComponentPageElementImpl.java:85)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:956)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$1800(ComponentPageElementImpl.java:61)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$PostRenderCleanupPhase.render(ComponentPageElementImpl.java:443)
at
org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72)
at
org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:124)
at $PageRenderQueue_135675e1f6b934.render(Unknown Source)
at $PageRenderQueue_135675e1f6b933.render(Unknown Source)
at
org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37)
...
Additionally we experienced a similar issue when using a component with
a mixin annotation in a loop, that was rendered more than 20 times on
the page.
The contention here was on the
org.apache.tapestry5.internal.util.NamedSet.getValues call
"http-9080-79" daemon prio=10 tid=0x00000000588dc000 nid=0x3e61 waiting
for monitor entry [0x000000004ad98000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.tapestry5.internal.util.NamedSet.getValues(NamedSet.java:78)
- waiting to lock <0x00000000e2fa4d70> (a
org.apache.tapestry5.internal.util.NamedSet)
at
org.apache.tapestry5.internal.util.NamedSet.getValues(NamedSet.java:257)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.mixinForClassName(ComponentPageElementImpl.java:892)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.getMixinByClassName(ComponentPageElementImpl.java:879)mvn
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.getMixinByClassName(InternalComponentResourcesImpl.java:366)
at
org.apache.tapestry5.internal.transform.MixinWorker$1$1.get(MixinWorker.java:92)
at
biz.toc.buyme.client.webapp.core.components.DHTMLTimer.conduit_get__informalElement(DHTMLTimer.java)
For the time being we removed the mixin, but on the loop issue I am
clueless.
Any suggestions or tips are very welcomed.
Kind Regards
Robert Lentz
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
For additional commands, e-mail: users-h...@tapestry.apache.org
