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how to tell memory useage of my app in a Mac

Posted on 2014-02-06
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Last Modified: 2014-02-11
i am introducing caching to one of my apps (it calls various service methods to access data from DB), and i want to find out how much extra physical memory it takes.  i have tried the activity monitor and also this:

$ Ps -ef | grep dsp
716566150  3234  1070   0  5:41PM ttys000    1:43.18 /Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/bin/java -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005 -server -Xms128M -Xmx512M -XX:+HeapDumpOnOutOfMemoryError -XX:PermSize=128M -Dcom.sun.management.jmxremote -Ddsp-env=osgi -Djava.net.preferIPv4Stack=true -Djava.security.egd=file:///dev/urandom -Djava.endorsed.dirs=/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/jre/lib/endorsed:/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/lib/endorsed:/Users/212353126/GIA150/dsp-k-1.5.0/lib/endorsed -Djava.ext.dirs=/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/jre/lib/ext:/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/lib/ext:/Users/212353126/GIA150/dsp-k-1.5.0/lib/ext -Dkaraf.instances=/Users/212353126/GIA150/dsp-k-1.5.0/instances -Dkaraf.home=/Users/212353126/GIA150/dsp-k-1.5.0 -Dkaraf.base=/Users/212353126/GIA150/dsp-k-1.5.0 -Dkaraf.data=/Users/212353126/GIA150/dsp-k-1.5.0/data -Djava.io.tmpdir=/Users/212353126/GIA150/dsp-k-1.5.0/data/tmp -Djava.util.logging.config.file=/Users/212353126/GIA150/dsp-k-1.5.0/etc/java.util.logging.properties -Dkaraf.startLocalConsole=true -Dkaraf.startRemoteShell=true -classpath /Users/212353126/GIA150/dsp-k-1.5.0/lib/karaf-jaas-boot.jar:/Users/212353126/GIA150/dsp-k-1.5.0/lib/karaf.jar org.apache.karaf.main.Main
716566150  3408  3182   0  5:59PM ttys004    0:00.00 grep dsp

but i am not sure what all the results mean.  for example, what is the memory usage?  is it possible to break the usage down to a finer level, e.g. by thread or service call?  also is there a way to log the usage?
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Question by:mmingfeilam
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by:Phil Phillips
Phil Phillips earned 250 total points
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I'm not aware of something that can show memory usage per thread, but you can see the usage of the JVM and its different memory spaces using jstat.

Here's the man page for OSX: https://developer.apple.com/library/mac/documentation/Darwin/Reference/Manpages/man1/jstat.1.html
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Valeri earned 250 total points
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put this lines before operation and after operation an you will see:

long usedMB = (runtime.totalMemory() - runtime.freeMemory()) / 1024 / 1024;
System.out.println("memory usage" + usedMB);

for more information use VisualVM, it's much more better than jstat.
http://visualvm.java.net/
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Expert Comment

by:serialband
Comment Utility
If you just wanted %mem, you could just do that with ps.

ps -meo %mem -o command|more
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