topic Re: Memory Issue in Operating System - HP-UX

Memory Issue

Alfonso_15 — Tue, 20 Sep 2005 17:29:21 GMT

Hi Guys:
I am using HP-UX9000/800
With command top i note my free memory is decreasing drastically. Yesterday the machine crashed. How I can to know the process that is consuming a lot o memory and causing this crash?
Thanks a lot

Re: Memory Issue

Geoff Wild — Tue, 20 Sep 2005 18:17:36 GMT

Try this script:

# cat memtop

#!/bin/sh
# memtop - show top memory users and pid
# VSZ is in KB
#
echo "VSZ(KB) PID RUSER COMMAND"
UNIX95= ps -e -o 'vsz pid ruser args' |sort -nr|head -30

Also, how much ram installed - and what is dbc_max_pct and dbc_min_pct set to?

Rgds...Geoff

Re: Memory Issue

Jon M Zellhoefer — Wed, 21 Sep 2005 14:02:09 GMT

Also look at ipcs -mob (you may have an application hogging your shared memory segments). If you have one with nattch = 0, with a large segsz, it's probably an app that had a large memory reserve which is not actually running and hasn't given that memory segment back to the system. You can remove these with ipcrm -m (shmid).

Re: Memory Issue

Raj D. — Wed, 21 Sep 2005 14:08:58 GMT

Hi Alfonso ,

Try checking the processes eating more memory..

# ps -el | sort -r -k10 | more

Also use ,
# glance

# sar -v
# glance -n
To see system table usuage..

Hope this will help,

Cheers,
Raj.

Re: Memory Issue

Steve Andrews_6 — Thu, 22 Sep 2005 07:41:04 GMT

You might also try the ipcs command to help determine who is locking up shared memory segments.
# ipcs -mob

Re: Memory Issue

Ted Buis — Mon, 26 Sep 2005 15:58:45 GMT

You might be able to get HP to analyze the core file from your dump if you are under software support.

Re: Memory Issue

Raj D. — Tue, 27 Sep 2005 03:28:20 GMT

Hi Alfonso ,

Get the crash dump , to send to HP ,
/var/adm/crash/crash.x [ Where x is the crash number ]

Also you can check the crash , by running the HP collection.sh script , also need the file crashinfo (binary) , in /var/adm/crash/ directory.

The output file will tell the cause of the crash.

Cheers,
Raj.