This totally depends on what your application does.
So nobody on this list can say something about it based the information you
give.
2GB is quite a lot of memory, so I think your application has plenty of memory
unless it is a very memory hungry program.
On 32 bits machines 2GB is a maximum amount per process for java code + native
code, so giving java 2GB leaves no room for native code and makes your java
crash with out-of-memory if the application uses a lot of memory for java
objects. On 64 bits machines this limit is a lot higher than 2GB.
You can also use jstat to few the realtime memory usage of your jvm.
jps gives the process-id's of the java processes
jstat -gc <process-id> 1000
gives the memory usage every 1000 miliseconds. See the documentation for more
info about jstat.
Greetings,
Ronald.
Op vrijdag, 19 december 2008 om 12:55 uur schreef Tomcat Users List
<users@tomcat.apache.org>:
Hi All,
Hope all are fine and enjoying best of health... thats good to know :D
Here is my question.
our Tomcat 6 server is running on a RHL machine with 4 GB Ram.
i have adjusted memory parameters as
JAVA_OPTS="$JAVA_OPTS -Xms1024M -Xmx2048M -XX:PermSize=128m
-XX:MaxPermSize=128m"
server is working fine with these parameters but i wnt to know that are
these parameters fine with my application or i need to change them for
better performance?
my server is running a Spring Framework mvc based application.
with these parameters most of time i get following stats when i execute free
-m command on server in peak hours (or something like that).
[r...@vopium ~]# free -m
total used free shared buffers cached
Mem: 4050 3622 428 0 385 2335
NOTE: only apache and tomcat is running on this machine. no other heavy
service running on this server.
Regards,
newbi
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