Hi ,
It is observed that stack changes for a program
on its invocation mulitple times on linux.
Distribution - Fedora Core release 4 (Stentz)
Kernel Version - 2.6.11
$> cat hello.c
#######################################################
#include <stdio.h>
main()
{
printf("\n Hello \n ");
printf("\n Take a break by sleeping for 5 seconds
... \n ");
sleep(5) ;
}
#######################################################
STEP 1
**********
$> ./hello
and immediately run
STEP 2
***********
$> ps -aeo rss,vsize,comm | grep hello ; echo ; pmap
`ps -aeo pid,comm | grep hello | awk '{print $1}'`
You will see that if you repeat the above steps
multiple times ( after the program exits),
the stack in 'pmap' output &
'vsize' in ps output keeps changing , though
the Resident set size of the process remains
same across all invocations.
Could somebody please explain this behaviour .
Cheers
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