Measuring memory used by a program?


 
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# 1  
Old 10-31-2008
Measuring memory used by a program?

I have a Java program. I want to measure the total memory used by the program, especially the peak memory. Is there a way to do it?

I have tried utilities like time (which returns 0) and top (which is not very useful) as the program does not run for long.

Can anyone suggest a way to do this?

Thanks,
Santhosh Pathical
# 2  
Old 10-31-2008
What OS - Linux?
# 3  
Old 10-31-2008
For Java-based programs, the best monitoring means is in the JVM itself - JMX. If you are not monitoring for too long time, you can leave JConsole open and it has a function of exporting the data to CSV file.

Refer to an earlier reply of mine for a similar question for further details:

https://www.unix.com/unix-advanced-ex...light=jconsole

Last edited by cbkihong; 10-31-2008 at 10:17 PM..
# 4  
Old 11-05-2008
Sorry for the late reply

Quote:
Originally Posted by jim mcnamara
What OS - Linux?
Yes it it Linux.


Quote:
Originally Posted by cbkihong
For Java-based programs, the best monitoring means is in the JVM itself - JMX. If you are not monitoring for too long time, you can leave JConsole open and it has a function of exporting the data to CSV file.

Refer to an earlier reply of mine for a similar question for further details:

https://www.unix.com/unix-advanced-ex...light=jconsole

Thanks for the help but I was looking for something for a more generic Unix/Linux utility that would help me to measure the memory usage as I also have other scripts for which I would like to see the memory usage.

Thanks,
Santhosh Pathical
# 5  
Old 11-14-2008
The language being Java makes it a bit more complicated. It's a bit like trying to measure how much memory a BASH script is using; anything you ask except maybe BASH itself would just tell you how much memory BASH is using.
# 6  
Old 11-14-2008
The process itself can call getrusage via JNI but the OS has to support getrusage first.If getrusage is not there then you can try opening /proc/self/status like a text file and read the values stored in there:
VmSize: 12084 kB
VmLck: 0 kB
VmRSS: 10280 kB
VmData: 9636 kB
VmStk: 188 kB
VmExe: 72 kB
VmLib: 2112 kB

Corona mentions a problem: the JVM process. You may need to get the pid of your process via a call to ps. Then access your values via pstat or the /proc filesystem or however your OS works.
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