topic Re: memory allocation in Operating System - HP-UX

memory allocation

Mohd Rasidi Che Mat — Thu, 29 May 2008 03:00:56 GMT

i i got this info from glance. is it possible to change its configuration?

Total VM : 6.2gb Sys Mem : 4.4gb User Mem: 14.5gb Phys Mem: 32.0gb
Active VM: 6.0gb Buf Cache: 13.0gb Free Mem: 215mb

Re: memory allocation

Jeeshan — Thu, 29 May 2008 03:44:23 GMT

Salam Rasidi

you can edir files in /ver/opt/perf directory to change the glance configuration.

Re: memory allocation

Jeeshan — Thu, 29 May 2008 03:44:35 GMT

Salam Rasidi

you can edit files in /ver/opt/perf directory to change the glance configuration.

Re: memory allocation

Mohd Rasidi Che Mat — Thu, 29 May 2008 04:45:49 GMT

actually we have user request to change memory allocation from:
Total VM : 6.2gb Sys Mem : 4.4gb User Mem: 14.5gb Phys Mem: 32.0gb
Active VM: 6.0gb Buf Cache: 13.0gb Free Mem: 210mb

To :
Total VM : 10.0gb Sys Mem : 3.2gb User Mem: 24.7gb Phys Mem: 32.0gb
Active VM: 9.8gb Buf Cache: 655mb Free Mem: 3.4gb

Is it can be changed?

Re: memory allocation

Jeeshan — Thu, 29 May 2008 05:13:38 GMT

for this you need to change the kernel parameters.

what is your dbc_max_pct and dbc_min_pct kernel parameters value now?

and what is your total memory?

Re: memory allocation

Jeeshan — Thu, 29 May 2008 05:15:53 GMT

i just exclude your output.

you have 32GB memory, right?

Re: memory allocation

Mohd Rasidi Che Mat — Thu, 29 May 2008 05:19:04 GMT

root@vinhdt01:(syslog)> kctune dbc_max_pct
Tunable Value Expression Changes
dbc_max_pct 50 Default Immed

root@vinhdt01:(syslog)> kctune dbc_min_pct
Tunable Value Expression Changes
dbc_min_pct 5 Default Immed

yes memory 32GB

Re: memory allocation

Asif Sharif — Thu, 29 May 2008 05:26:59 GMT

Salam Rasidi,

dbc_max_pct defines the maximum percentage of memory to be used by dynamic buffer cache.
Minimum 2
Maximum 90
Default 50

dbc_min_pct defines the minimum percentage of memory to be used by dynamic buffer cache.
Minimum 2
Maximum 90
Default 5

In your case you are using default values, Change them according to your need.

Regards,
Asif Sharif

Re: memory allocation

Mohd Rasidi Che Mat — Thu, 29 May 2008 05:31:16 GMT

salam asif,
is that means only Buf Cache can be tuned? how about others?

Re: memory allocation

Asif Sharif — Thu, 29 May 2008 06:01:52 GMT

Wa-Alaiakum Assalam,

read the following thread.
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=252307

Regards,
Asif Sharif