On 31.08.2010 10:34, takanobu watanabe wrote:
Hello,
What is default value of CATALINA_OPTS at apache-tomcat-6.0.29 ?
It means No configure catalina.sh as same as value of CATALINA_OPTS
just expand tomcat.
Because I try to run tomcat lean physical memory condition(128Mb only
with armv5).
When nothing configure to catalina.sh(default),Tomcat works well.
But when I configure below,looks like always FullGC running and could
not access WEB service.
---
CATALINA_OPTS=" -verbose:gc -XX:+PrintGCTimeStamps -Xms64m -Xmx64m
-XX:NewSize=32m -XX:MaxNewSize=32m
-XX:SurvivorRatio=2 -XX:PermSize=16m -XX:MaxPermSize=16m"
---
If anyone has idea or suggest of run tomcat on lean physical memory
condition, I would like to know.
If you don't add explicit memory options, the default memory sizes of
your JVM are used. Those might depend on the exact jvm version and also
on the type of system you run it on (total memory, CPUs).
The easiest way to find out the sizes for your jvm are running it
without explicit settings and then measuring it. Measuring can be done
with tools like jstat, jconsole or jvisualvm, or you can add a few
verbose gc flags to print out the sizes of the different memory regions
during each run of the GC, e.g.
-verbose:gc -XX:+PrintGCDetails -XX:+PrintHeapAtGC -XX:+PrintGCTimeStamps
Note that the default settings will allow some of the regions to grow
and shrink, so you need to make observations for a longer time to find
out the values which are effective most of the time.
I expect your above settings might not leave enough room in the Old
Generation (aka Tenured), because your New Generation is somwhat large
relative to the Old Gen. Tomcat itself doesn't need much memory and you
should be able to run it with less than 64MB Heap (plus Perm), but what
you need in the end depends on the application inside (and the
concurrency induced by the load). I never experimented to find a minimum
value though.
Regards,
Rainer
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