help jvm memory utilization monitor 1

[antonioelderprado]

Hi,
first I am unix sys admin, and not a java person, so pardon my ignorance. I was called to help on this problem. WE have several production machines that uses java for monitoring and scheduling, what I need to know is how to monitor the memory usage of these java processes. I have jdk1.5 that under bin has tools like: jstat, jmap, jinfo; however I have no idea on how to use and what to look for.
I know it is lots to ask, but any help is mostly welcome.
thank you all
./antonio/.

./antonio elder prado/.
.\mountain view, ca\.
./bauru, sao paulo/.

 

[sedj]

while [ 1=1 ]
do
  top -b -n 1 | grep java >> /tmp/top_data
  sleep 1
done

?


--------------------------------------------------
Free Java/J2EE Database Connection Pooling Software

http://www.primrose.org.uk

 

[antonioelderprado]

Hi sedj

thank you for that; however they want specific tools using java (like those I mentioned before); lprstat would do just that, but I believe (correct me when wrong) jvm has lots of stuff in the background (stacks mgmt, gc, etc), and they want all these info from jvm.
appreciated,

thank you
./antonio/.

./antonio elder prado/.
.\mountain view, ca\.
./bauru, sao paulo/.

 

[sedj]

ASFAIK, without actually altering the code itself (adding in calls to check the memory usuage using the java.lang.System class), the best way of checking the amount of memory used by a process (ie the JVM), is how much memory the actual OS thinks the process is using.

--------------------------------------------------
Free Java/J2EE Database Connection Pooling Software

http://www.primrose.org.uk

 

[antonioelderprado]

Sedj,

I will go with your opinion, because we cannot change the java codes.
thank you very much sadej,

peace,

./antonio/.

./antonio elder prado/.
.\mountain view, ca\.
./bauru, sao paulo/.

 

[Diancecht]

Here you have a tutorial on 1.5 monitoring and management tools:

http://java.sun.com/j2se/1.5.0/docs/tooldocs/

Note that some of them are experimental.

Another solution would be using a profiler. (Search java profiler to find a lot) but I'm afraid most of them need a deep knowledge of Java.

Btw, nice to know there are production systems under 1.5. They're the first I've heard of.

Cheers,
Dian