topic Re: Memory Page out in Operating System - HP-UX

Memory Page out

David Willams — Thu, 17 Feb 2011 07:17:22 GMT

1.What does memory page out mean,

2.what if it is high like 2.2 always and what if this is high only once or twice in a day... what does it mean

Re: Memory Page out

Manix — Fri, 02 Sep 2011 19:55:56 GMT

>.what if it is high like 2.2 always ??

Please explain that a bit !!

Do read these threads.

http://h30499.www3.hp.com/t5/System-Administration/How-to-decrease-page-out/m-p/4584406#M374193

http://h30499.www3.hp.com/t5/General/High-page-out-What-is-this-how-can-I-solve-this/m-p/4252755#M136579

Thanks
Manix

Re: Memory Page out

Ismail Azad — Thu, 17 Feb 2011 10:34:00 GMT

Hi,

"Page out" refers to a page that has been transferred from you RAM to swap space. If "paging activity" is high and the virtual memory subsystem continuosly pages in and pages out processes then, the system is said to be in a "thrashing" condition.

If your system is "thrashing" then, purchasing more RAM would be one approach. When you talk about "thrashing", the swapper daemon comes into the picture which is a daemon that starts very early in the booting process, even before init!

Regards
Ismail Azad

Re: Memory Page out

Rita C Workman — Thu, 17 Feb 2011 14:39:11 GMT

Paging out can be cause by a number of things, here's a few:

Poorly written program/querries.
Application not properly releasing resources when done.
Poorly tune kernel parms.
Not enough physical memory to meet demand.

Regards,
Rita

Re: Memory Page out

Emil Velez — Thu, 17 Feb 2011 23:43:51 GMT

IF it happends occasionally that usually means that your systems is running low on memory and close to out of memory.

You are on the boarder. Why not look at your long term performance agent data and see how much memory your sytem has free.

look at these parameters
dbc_max

or on 11.31
filecache_max

if these parameters are set to 50% of memory you really need to lower these.

THis is your file cache. I suggest that you lower this number a few percent and see if your system continues to be low on memory.

The filecache max is the maximum amount of memory used by the filecache.

you do not want to run low on memory since everything slows down and paging occasionally happens.

Good luck

Emil