topic Re: Problem with memory in Operating System - HP-UX

Problem with memory

CSA-PROD — Fri, 15 Mar 2002 13:28:19 GMT

I have a server k570 with hp-ux 11.0. This server has total physical memory 1024 Mb.Five days ago after reboot i see with glance that user mem was 130 Mb,today user mem is 300 Mb.I think that it's strange because on the system, there aren't any database or application.What is the cause of this situation?Thanks a lot!

Re: Problem with memory

Peter Scott — Fri, 15 Mar 2002 16:06:27 GMT

It would be impossible to tie down what the memory was used for at any one time without looking at exactly what processes were running at that instant, and what user memory utilisation each running process was making at that time.

Memory allocation is dynamic and will fluctuate as time passes.

Re: Problem with memory

Steven Gillard_2 — Fri, 15 Mar 2002 16:14:42 GMT

This may be normal, or you may have a process with a memory leak. The only way to find out is to keep your eye on what is happening. To get a sorted list of processes and their memory usage, run:

$ UNIX95= ps -eo "vsz args" | sort -n

You can then see which processes are using the most memory. If you have measureware running you will be able to view historical data as well.

One common memory leak issue on hpux 11 is with the mib2agt process - if you see this process at the top of the list then apply patch PHSS_26138.

Regards,
Steve

Re: Problem with memory

CSA-PROD — Fri, 15 Mar 2002 16:25:29 GMT

Thanks,

I do some controls with glance, top, vmstat, sar, but i don't found nothing significant.
The other resource have not problems; cpu, disk and network are ok, but the memory is strangely used.Is it normal that without any particular application, the usage of memory is 300 mb?
what do you suggest me to try?

BYE

Re: Problem with memory

John Payne_2 — Fri, 15 Mar 2002 20:20:37 GMT

If you are really worried about seeing where this memory is going, I suggest you run the x-version of glance, gpm. (gpm is the command to type.) You should open the process list if it is not opened for you. (Reports -> Process list) The process list has a column for Res Mem and Virtual memory. The Res Mem entry is the actual physical memory the process has 'Resident.'

If you go to 'help' and turn On Item to on, you can click on just about anything in gpm, and a help window will open.

You can configure gpm to list processes above a certain threshhold of Res. Mem by using the filters (Configure -> Filters).

Good Luck

John

Re: Problem with memory

CSA-PROD — Mon, 18 Mar 2002 09:33:48 GMT

Thanks!
I do some other controls but i don't found any particular process that has a RSS value higher than normal.User mem is always about 350Mb (of 1024Mb)