configuration of thread pool used by Tomcat

["Agarwal, Naresh" <na...@informatica.com>]

Hi
 
How does thread creation/destruction works in Tomcat?
 
Is the total no. of threads in thread pool maintained by Tomcat varies as load varies? 
 
Does Tomcat destroys threads in the pool, if they are idle for the long time? If yes, is there way to ensure that Tomcat didn't kill the idle threads, ie., once created, a thread will never die as long as Tomcat is running?
 
If I keep Min_no_of_threads = Max_no_of_threads = 20, then can I assume that Tomcat will always use 20 threads?
 
 
thanks,
Naresh