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

Memory leakage

Shivkumar — Mon, 27 Jun 2005 13:35:28 GMT

Dear Sirs,

How to find out memory leakage due to applications or programs or shared objects by using hpux commands ?

Thanks,
Shiv

Re: Memory leakage

Pete Randall — Mon, 27 Jun 2005 13:45:27 GMT

Shiv,

Check these threads:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=131413
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=104024
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=686131

Pete

Re: Memory leakage

RAC_1 — Mon, 27 Jun 2005 13:47:50 GMT

date;UNIX95= ps -C"your_prigrm_name" -o "vsz,args,pid" >> /tmp/mem.log

Run this through cron peridically. (for every 5 minutes or so)

If the values for vsz, go on increasing all the time, it may be memory leak problem.
If you have glance, there is alert defination for it. (I think /opt/perf/examples/adviser/proc_mem_leak)

Yuo can put that in alarmdef file and it will prompt you if it finds one.

Anil

Re: Memory leakage

Bill Hassell — Mon, 27 Jun 2005 17:05:58 GMT

All you can find is the size of the program and the size of any shared memory segments that the programs might use. There is no magic to finding a memory 'leak' because the program(s) may be working exactly as designed. As mentioned, you can use the extended ps command (the UNIX95 value) and record this into a file which you then monitor for growth. ps only shows local memory. Shared memory is monitored with ipcs -bmop and as before, you'll have to repeatedly store the results to look for growth. If you see a program that constantly grows, you have to talk to the programmer to see if this is a mistake or normal.