JVM Using more than -Mx Memmory and RSS

Question

Hi All,
Used -Xms256m -Xmx512m parameters for weblogic Admin server 10.0.1.0, 9.2.2, but the server is using more than the value specified and it is not
happening for weblogic version 10.3, This was found while cross checking with
ps and prstat.
and no application is deployed in the above admin instance.
Process grep'd below
bash-3.00# ps -ef | grep -i java
advboprd 13639 1279 1 Mar 06 ? 1673:18 /usr2/BEA10MP3/jdk160_05/bin/java -server
-DWls10=bocaejb-admin -Xms256m -Xmx512 (THIS IS WLS 10.3 WORKING AS EXPECTED)
advboprd 28246 1279 0 Mar 07 ? 159:38 /usr2/BEA92MP2/jdk150_10/bin/java -server -Dwls92=ace-admin -Xms256m -Xmx512m - (THIS IS WLS 9.2.2 NOT WORKING AS EXPECTED)
advboprd 1616 1279 1 Jan 18 ? 141803:32 /usr2/BEA10MP1/jdk150_11/bin/java -server -DWls10=vtm-admin -Xms256m -Xmx512m -(THIS IS WLS 10.0.1.0 NOT WORKING AS EXPECTED)
Cross checked the same process with prstat
bash-3.00# prstat | grep -i java
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
1616 advboprd 3173M 2932M cpu21 22 0 2363:33:0 21% java/150
13639 advboprd 466M 447M run 7 0 27:53:56 1.7% java/93
28246 advboprd 758M 541M run 59 0 2:39:41 0.0%
java/91
Please note the the process id 1616,28246 are corssing the specified value where as
the process 13639 (10.3) is not.
Memmory Value defined
CMD="${JAVA_HOME}/bin/java -server -D${VERSION_LABEL}=${PROC_NAME} -Xms256m -Xmx512m \
-XX:MaxPermSize=128m \
-da \
As I know JVM uses a extra memmory for JVM internal use, however but not expected to consume this huge memmory.
-Suresh

Answer 1

yes the max size set to 512.
ps -ef | grep 11335
nbkmsfh 21053 831 0 10:19:29 pts/23 0:00 grep 11335
advboprd 11335 1279 0 Oct 04 ? 134315:58 /usr2/BEA10MP1/jdk150_11/bin/java -server -DWls10=fiedo-admin -Xms256m -Xmx512m
prstat -L -p 11335 1 1
$ prstat -L -p 11335 1 1
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/LWPID
11335 advboprd 3167M 2908M sleep 4 0 143:52:04 0.4% java/94
11335 advboprd 3167M 2908M sleep 4 0 60:45:05 0.3% java/318
11335 advboprd 3167M 2908M sleep 1 0 126:20:00 0.3% java/267
I see the Heap size occupied , from pmap.
00010000 64K r-x-- /usr2/BEA10MP1/jdk150_11/bin/java
0002E000 16K rwx-- /usr2/BEA10MP1/jdk150_11/bin/java
00032000 56K rwx-- [ heap ]
00040000 3840K rwx-- [ heap ]
00400000 258048K rwx-- [ heap ]
10000000 2359296K rwx-- [ heap ]
total 3238528K
-Suresh