Measuring memory used by a program?

Applications Programming
1

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

What OS - Linux?

3

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:

4

Sorry for the late reply

Yes it it Linux.

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

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

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.