topic Re: memory usage 11.23 in Operating System - HP-UX

memory usage 11.23

Philip J. Priest_1 — Mon, 29 Aug 2005 10:28:08 GMT

Would it be normal to expect 11.23 to be using this amount of memory:

glance
Total VM : 2.0gb Sys Mem : 522mb User Mem: 350mb Phys Mem: 1022mb
Active VM: 1.8gb Buf Cache: 102mb Free Mem: 48mb

swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 2048 247 1801 12% 0 - 1 /dev/vx/dsk/rootdg/swapvol
reserve - 718 -718
memory 1022 569 453 56%
total 3070 1534 1536 50% - 0 -

thanks!
Phil

Re: memory usage 11.23

RAC_1 — Mon, 29 Aug 2005 10:30:57 GMT

Your buffer cahe is at 1.8 GB
that is too much. you might be having default buffer cahe as follows.

dbc_max_pct is 1t 50%

Should not be that much. Depending upon apps/databases you run set it about 300-400mb.

Re: memory usage 11.23

Pedro Cirne — Mon, 29 Aug 2005 10:31:58 GMT

Hi,

I think that's a normal situation, of course that memory usage depends on the processes/applications running on the server, but from the information provided I think things are "normal"

Enjoy :)

Pedro

Re: memory usage 11.23

Pedro Cirne — Mon, 29 Aug 2005 10:34:00 GMT

Hi RAC,

I think Buffer Cache is 102Mb, not 1.8Gb! :-)

Enjoy!

Pedro

Re: memory usage 11.23

Steven E. Protter — Mon, 29 Aug 2005 10:36:49 GMT

I recommend dbc_max_pct to be 7% and dbc_min_pct to be 5%.

This will limit cpu expensive changes in the buffer cache.

The numbers are not as important as the difference between them.

UPERFKBAN00000726
http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&admit=-682735245+1125328248032+28353475&docId=200000077186712

That article might also be of use.

SEP

Re: memory usage 11.23

Tim Nelson — Mon, 29 Aug 2005 10:55:11 GMT

Looks to me that buffer cache is only 102MB as well.

2GB VM
522mb system
350mb user
1022mb phisical
102mb buffer cache
48mb free (you will be swapping soon)

All usages are look accurate and normal for a HPUX system.
Depending on the system, 1GB of physical RAM is not much.

first recommendation is to up physical to 2GB
if not possible start tuning down soem kernel settings. View systems table through glance and tune down those first.

Re: memory usage 11.23

Philip J. Priest_1 — Mon, 29 Aug 2005 11:54:29 GMT

Which kernel params would i take a look at first?

thanks!
Phil

Re: memory usage 11.23

Philip J. Priest_1 — Wed, 30 Nov 2005 11:37:28 GMT