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How to monitor a production java process running on linux

Posted on 2013-12-26
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Last Modified: 2014-01-27
I need to monitor a java process. At present I monitor the cpu and memory used by it using top command.
And then for that process_id I log the output of
1. lsof -p ${process_pid}
2. pstack -p ${process_pid}
3. top -n 1 -b -p ${process_pid} -H

But these are not giving me any useful results together. How do i collate useful details from them?

I am aware of some useful tools inside jdk folder, but i cant use them as they are not part of the production server.
Is there any detail provided by jvm and linux OS other than what I have listed above?
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Question by:pvinodp
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Expert Comment

by:Sharon Seth
ID: 39741313
What do you need to monitor , apart from cpu and memory?
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Author Comment

by:pvinodp
ID: 39741324
which jar is taking how much memory. what is the memory occupied by a class.
Same details for cpu as well.
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Assisted Solution

by:Radek Baranowski
Radek Baranowski earned 250 total points
ID: 39741405
commandline/linux tools won't give you that. the only way is to analyze thread dump or use jmx console wchich is a part of JDK (not JRE)
(binary util jconsole in <jdkhome>/bin)
I'm not sure though if there's any way to use it in batch mode, I doubt it, so there's only way to monitor it visually)
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Author Comment

by:pvinodp
ID: 39741456
i am well aware of tools within jdk.
I need to know if there is any help available from jre or linux OS
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Assisted Solution

by:Radek Baranowski
Radek Baranowski earned 250 total points
ID: 39741538
hmmm..

I googled a bit and found something like that:

https://coderwall.com/p/il3h4g

yet this yields stats you want (I guess) but only AFTERWARDS I mean, the execution needs to end to generate java.hprof.txt file..

more options described here:
http://docs.oracle.com/javase/7/docs/technotes/samples/hprof.html

enjoy
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Author Comment

by:pvinodp
ID: 39741842
https://coderwall.com/p/il3h4g:: This link suggest that I start the java process with the arguments. But i need to sniff the production java process which has already started and giving trouble. Moreover jhat is part of jre and not jdk.

Even the second link requires similar process.


let me know if I have wrongly understood.
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Expert Comment

by:Radek Baranowski
ID: 39741858
yes, possibly.

well what you are trying to do can only be achieved by either jconsole or dumping heap/thread dumps with kill -3 <pid> and analyzing it with available tools (Java Heap/Thread dump analyzer from IBM or write parser of your own)
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Assisted Solution

by:AdminRAM
AdminRAM earned 125 total points
ID: 39744896
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Accepted Solution

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Ajay-Singh earned 125 total points
ID: 39747742
If a java process is already started with non-instrumentation options, there is very little we can do. However, in practice, i found the following handy and often helps me figure out most the the issues:


1. Take thread-dump: java -QUIT <pid> prints the thread-dump on the console. Useful in working with locks, dead-locks and application flows.
2. Heap dump, use jmap to dump the heap. It gives insights of the objects, leaks
3. jstat - prints stat information of running jvm.
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Author Closing Comment

by:pvinodp
ID: 39811877
thats a lot useful information. thanks all
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