Tomcat heap memory allocation in Linux 2003-09-24 - By sqdang@(protected)
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Hi,
I am using tomcat 4.1.27 running on Red Hat Linux 9 and Sun's JDK 1.4.1_01.
Here is my issue. I wanted to allocate more heap space to run tomcat. So, I
placed the following line in the file catalina.sh:
JAVA_OPTS="-Xms256m -Xmx400m"
I shut down tomcat, reboot linux, and started tomcat. I executed the command
top to verify the memory is actually being used up by tomcat. Here is the
result of the top command:
CPU states: 0.5% user, 8.7% system, 0.0% nice, 90.7% idle
Mem: 384716K av, 183864K used, 200852K free, 0K shrd, 18980K buff
Swap: 257000K av, 28672K used, 228328K free 59340K cached
If you noticed, memory usage is less than the 256MB that I specified. If you
consider that other processes are also running, tomcat is not consuming the
initial 256MB that I specified in the JAVA_OPTS. I thought maybe the start
command for tomcat is worry. So, I ran a ps on the tomcat process and got the
following:
UID PID PPID C STIME TTY TIME CMD
root 6982 1 0 15:11 pts/1 00:00:11 /var/app/java/bin/java -
Xms256m -Xmx400m -Djava.endorsed.dirs=/var/app/tomcat/bin:/v
I think this showed the executed command to start tomcat is correct. I am not
sure what is going on. Is the top command not returning an accurate reading?
Am I forgot to do something here? By the way, I also tried CATALINA_OPTS
instead of JAVA_OPTS and got the same result.
Here is the strange thing. When I used the JAVA_OPTS with tomcat 4.1.27
running on Windows2000 server and Sun's JDK 1.4.1_01, tomcat is actually
consuming the initial memory that I specified in JAVA_OPTS.
Does anybody have an idea? Any help would be appreciated.
Thanks,
Son
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