1024K stack?  Isn't that a bit large?  I think the default stack size is around 64K or 
96K, depending on your JVM version.  I think that setting is the stack size per-thread 
(someone correct me if I'm wrong!).

See the volano report http://www.volano.com/report/.  Here's an excerpt:

anonymous wrote : The main trick in getting these Java platforms to handle the 
required number of threads is to reduce the size of the thread stack with the -Xss 
option. I generally set the stack size to 32 kilobytes when permitted by the Java 
virtual machine on startup. Otherwise, I set the stack size to the minimum required by 
the virtual machine: 64 kilobytes for the HotSpot Server VM on Solaris and 96 
kilobytes for the version 1.4.1 HotSpot Server VM on Linux and FreeBSD. 
  | 

What happens if you try your setup with -Xss96K 


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