Hi Benoit,
On Jun 8, 2007, at 11:24 AM, Benoit Cantin wrote:
On one of our apps, we have what I describe in the subject.
The growing worker threads is not the problem It is just a symptom
of the problem.
Application runs on xserve dual G5 and wo 5.3.3. Only one instance,
multithread disabled. Adaptor settings are given in the attachement
(sorry for this).
The workflow is the following : only 3 users connect to the
webobjects backend through one direct action. In this direct
action, there is a call to the the session().defaulteditingcontext
() method initiating the creation of a session. That is what I
understand from the doc.
Just calling session() is sufficient.
Now we come to about 250 sessions created, then log says :
[2007-06-08 19:54:00 CEST] <WorkerThread14>
<com.webobjects.appserver._private.WODefaultAdaptor>: Growing
number of WOWorkerThreads to 32
That is a symptom of a bug in your application. Having more than 16
worker threads is either a sign of a bug, or an indication that you
need to run more instances as load is too high.
But just before and after, application becomes sloooooooow. It
processes one request a minute and then application becomes
unreachable.
It is the slowness that is causing the extra worker threads to be
created. You need to find why it is getting slow. I suspect that
your sessions are not terminating properly and that memory is running
out and the app is spending too much time doing garbage collection.
If could be a deadlock, but then the app should just stop responding,
not get slow.
My question is : from where does this problem come from ? Can this
be from WODefaultAdaptor settings which I didn't modify ? sessions
in direct action ? Anything else.
Please let me know if you have ideas or wish any other info.
Check the app log for exceptions. Have you overridden awake, sleep,
or terminate in the Session class? Don't let those methods throw any
exceptions!
Chuck
--
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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