topic Re: Swap Utilization in Operating System - HP-UX

Swap Utilization

Sridhar — Mon, 18 Jul 2011 09:49:39 GMT

In my sysystem swap utilization is always on 74% as shown below.

#-> swapping -tam
             Mb      Mb      Mb   PCT START/      Mb
TYPE      AVAIL    USED    FREE USED   LIMIT RESERVE PRI NAME
dev        8192     725    7467    9%       0       -    1 /dev/vg00/lvol2
dev       12288     725   11563    6%       0       -    1 /dev/vg00/lvswap
reserve       -   19030 -19030
memory    12719    4071    8648   32%
total     33199   24551    8648   74%       -       0    - ====> I need to know what this TOTAL states... Is this is the actual swap utilization %

Re: Swap Utilization

raj — Mon, 18 Jul 2011 10:13:49 GMT

You can refer this link

http://fixunix.com/hp-ux/143657-swapinfo-memory.html

Re: Swap Utilization

Steven E. Protter — Mon, 18 Jul 2011 14:02:36 GMT

Shalom,

swap is reserved when a process is launched, based on memory requirements. For many daemon processes this never changes.

HP-UX factoid:
Memory is calculated by physical memory plus swap.

Therefore 74% of your total which is approximately 32 GB is being "used"

This may or may not be a problem. I would take a look at vmstat output to see if there is paging.

reserving swap is not necessarily a problem. Once processes are being paged to and from swap, in and out of active memory, then this may be a problem.

If there is a problem, the normal responses are:
1) Reduce memory use.
2) Increase physical memory.

If you wish to pursue details, post vmstat output and the output of the command model.

SEP

Re: Swap Utilization

Dennis Handly — Mon, 18 Jul 2011 16:58:09 GMT

>I need to know what this TOTAL states. Is this is the actual swap utilization %?

Yes, that's what Total means. 24.5 Gb is 74% of 33.2 Gb.

Note this is how much swap that's reserved, not how much has been swapped yet.

(Notice the large "reserve" but small used under "dev".