You cannot go by the memory sizes given by ps. In other words, if you add up 
the memory used by all processes the sum will be much larger than the actual 
amount of memory used, mainly because any shared libraries and shared memory 
areas appear physically only once in memory but are listed for each process 
that uses them. For a detailed explanation, see 
http://virtualthreads.blogspot.com/2006/02/understanding-memory-usage-on-linux.html

And because of the threading model you are using, each thread for the java 
processes running JBossAS will show the same memory, so it looks like a lot 
more memory being used than what it really is.

Finally, it is typical for an application server to have dozens of threads when 
it first starts, and then grow to hundreds of threads as it gets busy. With 
your threading model, you will end up with hundreds on process entries.


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