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From János Löbb <janos.l...@yale.edu>
Subject Re: very slow class loading on initial JSP/servlet request after restart
Date Fri, 20 Feb 2009 15:47:46 GMT

On Feb 20, 2009, at 10:25 AM, André Warnier wrote:

> Christopher Schultz wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>> Sam,
>> On 2/19/2009 6:23 PM, Sam Hokin wrote:
>>> The problem, which spontaneously appeared a few days before  
>>> Christmas on
>>> this one server, is that the initial request of a JSP or servlet  
>>> takes
>>> AGES to respond, usually exceeding several minutes.
>> Good... then you'll have plenty of time to /take a thread dump/ while
>> it's spinning its wheels.
>> I'll cast my hat into the ring: I suspect you're loading a resource  
>> that
>> wants to looking an external resource (like an XML file with a remote
>> DTD/Schema and validation is on in the parser) and the DNS is  
>> tripping
>> you up.
> I would like to point out at this moment that my initial analysis  
> (the one with the reindeers) does not look so bad after all.
>
> More seriously, and for my own and possibly the OP's edification :  
> we thus have 8 cores/cpus available, and one webapp being loaded at  
> Tomcat startup, which takes ages, but independently of class  
> compilation, Java and Tomcat versions etc..  Say we have told Tomcat  
> to start 100 threads.
> Does that mean that possibly 8 threads (or more) are all (rather  
> busily) waiting for something in relation to some initialisation in  
> the (rather suspect) classes belonging to that webapp ?
> The OP also mentions "the initial request takes ages".  So this  
> initialisation would not happen really at Tomcat startup, but at the  
> first request.  Any particular setup or circumstance that could be  
> tried to change when this happens, just to see ?
>

No, it is definitely not the reindeers, but an octo-pussy :)

János
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