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JVM memory usage

Posted on 2009-07-11
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Last Modified: 2012-05-07
Hi: There!

I have tomcat and MYSQL running in same machine. My OS is Linux Ubuntu. I try to see how big memory consumption by MYSQL and JVM(tomcat). My stratergy is to use: free -m to check how big memory is used by both of them. Then I try to check tomcat JVM's conumption. After that, I also could know the memory consumption of database. But I do not know how to check JVM memory consumption. Could someone tell me some solution or are there better way?
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Question by:JianJunShen
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LVL 92

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by:objects
objects earned 400 total points
ID: 24829964
top will show memory usage by all processes, the RES column is the one of interest to you.
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LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 100 total points
ID: 24829967
top will show you. Look for the java process
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LVL 92

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by:objects
objects earned 400 total points
ID: 24829993
Its most likely tomcat thats your problem.
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LVL 92

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by:objects
objects earned 400 total points
ID: 24830001
and be aware that its memory usage will grow over time so check its usage at startup as well as after it has been nrunning for a decent amount of time.
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LVL 86

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by:CEHJ
CEHJ earned 100 total points
ID: 24830022
If you want something a little friendlier, try htop:

http://htop.sourceforge.net/
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LVL 92

Accepted Solution

by:
objects earned 400 total points
ID: 24830029
this will give you the usage

ps aux | awk '{print $4"\t"$11}' | sort | uniq -c | awk '{print $2" "$1" "$3}' | grep java

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Author Comment

by:JianJunShen
ID: 24830036
Thanks such excelllent answers. I highly appreciated to all.
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