Re: Why is tomcat (java) so memory intensive?

[Andreas Vombach]

I would also be interested in some memory/performance tuning 
possibilities. Ok, if you do not run it standalone but with Apache the 
web response times should be faster, my profiling gives me the following:

CPU SAMPLES BEGIN (total = 8628) Tue Dec 21 16:10:18 2004
rank   self  accum   count trace method
  1 33.68% 33.68%    2906 300647 java.net.SocketInputStream.socketRead0
  2 20.70% 54.38%    1786 300557 java.net.PlainSocketImpl.socketAccept
  3 20.17% 74.55%    1740 300542 java.net.PlainSocketImpl.socketAccept
  4 20.12% 94.67%    1736 300551 java.net.PlainSocketImpl.socketAccept
  5  1.36% 96.02%     117 300669 java.net.SocketInputStream.socketRead0
I think everybody can reproduce profiling with e.g.
set JAVA_OPTS=-server -Xms500M -Xmx1000M 
-Xrunhprof:cpu=samples,interval=20,dept=5

in startup.bat /sh
I run tapestry and castor with my web-apps and would assume that they 
eat most cpu, not the http transfer. You see I give enough memory to 
avoid Out of memory Exceptions ...

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