Chuck,
thanks for the rapid and useful response.
The server has a low CPU load and low request rate, so it's not the
server. I believe that some requests are causing a deadlock in their
worker thread, and these build up until the max descriptors limit is
reached.
I've used your default adaptor info to extract the current number of
active threads, and if they get above a reasonable number, log the
request. This might help us find the cause of the problem.
Regards
Thomas
On 26/09/2008, at 1:03 PM, Chuck Hill wrote:
Hi Thomas,
On Sep 25, 2008, at 7:51 PM, Thomas wrote:
I have a deployed application that is occasionally opening a huge
number of file descriptors and brining down the server. I believe
that it is caused by one or more requests getting stuck, and
because each worker thread opens many files, the max descriptors
limit is reached.
I want to test my theory by measuring the number of worker threads
that are currently open, and compare this with a similar
application without the problem.
How do I measure the current number of active worker threads? It
doesn't appear in the WOStats page.
Not easily.
((WODefaultAdaptor
)WOApplication.application().adaptors().objectAtIndex(0)).toString()
will get you a string that contains the number you want among other
things.
I'd consider going at it from a different angle: limit the number of
worker threads. More than a handful or so probably indicates
problems you need to deal with in terms of optimizing the
implementation or deploying more instances (and servers if needed).
Try launching with
<pastedGraphic.pdf>
Refer to http://developer.apple.com/documentation/WebObjects/WOAppProperties/Articles/ApplicationProperties.html#/
/apple_ref/doc/uid/TP40005337-SW1
Chuck
--
Chuck Hill Senior Consultant / VP Development
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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