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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Tomcat 4 threads
Date Mon, 01 Dec 2003 19:57:21 GMT

Howdy,

>In what moment new threads are created in Tomcat when it's running?

Under many possible circumstances: new webapp deployed, new request
arrived and current # processors on the receiving connector less than
max and all processors busy, some new JNDI resources (e.g. 3rd party
datasource reaper thread), some app code (e.g. log4j's configureAndWatch
call), many many.

>Is there a thread pool? In case positive:

For some things, notably request processors, there's a pool.

>- What is the initial quantity of threads created?

You specify it, see server.xml.

>- What is the stagger algorithm?

You didn't really mean to ask that in this context, did you?

>- After created, when a thread terminates (end of life, release)?

For request processors in current coyote, answer is when the server
dies.  But again there are many possible permutations.

>- What means o large number of threads? Many users? Many sessions? Many
>requests?

Any and all of the above as well as none of the above.  Consider for
example a server configured with ten connectors, each with 100 min spare
processors, one webapp per connector calling log4j's configureAndWatch
-> 10*100 + 10 = 1010 threads.  And that's just on startup, before
receiving any requests or creating any sessions ;)

Yoav Shapira




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