Find the dynamic stack and heap size of a running process in rhel

marifran · 08-26-2010, 11:47 PM

I am trying to find the dyanmic heap size and stack size of a running process in rhel5.5 and rhel6.I read that the 23rd parameter in the file /proc/pid/stat gives the heap size.Can you elaborate more on this.Also is there any other way to do this??

DrLove73 · 08-28-2010, 12:26 AM

Code:

heap=$(awk '{print $23}' /proc/3045/stat) ; echo $heap

Change actual number of proces, most likely you will check it with bash. And make sure I havent mist the number ($23), maybe it is $22.

marifran · 08-29-2010, 11:55 PM

Yes but how do i verify that the 23rd parameter is the heap size?There is no documentation available from redhat and also the man page says it is vmsize..does this mean it is the virtual memory size??how do i calculate the heap size from the number of pages used by a process?

DrLove73 · 08-30-2010, 06:51 AM

Then either ask Red Hat support or install kernel sources and look at /usr/src/linux/fs/proc/array.c file for answers.

You can also use codes from "man proc" about stats to format data in "ps" command, like:

Code:

ps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm | grep <PID number>

Choose what you like to see and awk from that.

Or mix and match and find what you need (field number) with ps command and then use my code from previous post.

marifran · 08-31-2010, 12:01 AM

thanks a lot!please let me know if you find some documentation or some other way.
what about the stack size?

syg00 · 08-31-2010, 02:15 AM

Quote:

Originally Posted by marifran

I read that the 23rd parameter in the file /proc/pid/stat gives the heap size.

Show us a reference for this assertion.