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

Sharing System Memory

Gamaliel — Wed, 17 Mar 2010 19:44:07 GMT

Hi Folks,

My server has 14 GB of physical Memory.

It's a database dedicated server.

It's running a Sybase ASE 15.0.1 database with 6 GB asigned.

The distribution of memory is:
5.3 GB System
1.4 GB Buffer
1.3 GB Free

I expected that I can give 10 GB to the database... so:
-) Have I misconfigured the server parameters so the system is wasting a lot of memory?
-) Is healthy to have the same amount of memory for the db and the system?

Best Regard from Mexico!

Re: Sharing System Memory

Dennis Handly — Thu, 18 Mar 2010 05:22:39 GMT

What HP-UX version are you running? Are you up to date with your VM patches?

The system may be caching lots of data because you aren't making more demands on it?

Re: Sharing System Memory

Gamaliel — Fri, 19 Mar 2010 20:08:43 GMT

Hi DH,

HP-UX 11.11

The database inside (within the 6 GB asigned) uses a cache area.

Re: Sharing System Memory

Dennis Handly — Sat, 20 Mar 2010 09:37:37 GMT

>The database inside uses a cache area.

I was thinking about the buffer cache and other system caches.

>The distribution of memory is:

What tool did you use to get this?

Re: Sharing System Memory

John Guster — Mon, 22 Mar 2010 13:17:06 GMT

please post the output of commands
1. /usr/sbin/kmtune|grep dbc
2. swapinfo -mat

Re: Sharing System Memory

Gamaliel — Wed, 24 Mar 2010 19:12:14 GMT

Hi DH, JG,

The tool to mesure the memory is glance.

# kmtune|grep dbc
dbc_max_pct 10 - 10
dbc_min_pct 5 - 5
# swapinfo -mat
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 29 4067 1% 0 - 1 /dev/vg00/lvol2
dev 14000 29 13971 0% 0 - 1 /dev/vg00/lv_swap
reserve - 6037 -6037
total 18096 6095 12001 34% - 0 -