Here is a chat from #tom...@freenode that pretty much explains it:
* nDuff tries to reproduce
nDuff umm
nDuff it's three process table entries, but that's just threads
nDuff it's only one copy of tomcat
nDuff NOTABUG.
nDuff mlaci, if you do a pstree on the lowest PID, you'll see that the other
two are its children.
mlaci nDuff, yeah, that's true, but that doesn't make me understand why
multiple instances are started by default
nDuff mlaci, they _aren't_ multiple instances, that's the point
nDuff mlaci, if you start Apache httpd with a multithreaded MPM, the threads
will show up as separate process table entries...
nDuff mlaci, ...but that doesn't mean there's more than one copy of Apache in
memory.
nDuff mlaci, ...looking more closely, it appears that the first two are part
of jsvc; they're normal and harmless.
nDuff mlaci, ...see the how jsvc works section at
http://commons.apache.org/daemon/jsvc.html
mlaci nDuff, the last url pretty much explains it. so 1) these processes are
all needed to make tomcat work and 2) they don't consume 3 times more memory
than a single tomcat process?
nDuff mlaci, (1) to make tomcat work in such a way that it can be controlled
via jsvc commands, yes; (2) no, absolutely not.
--
Tomcat 6 init script spawns 3 Tomcat instances
https://bugs.launchpad.net/bugs/404097
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