topic Memory usage in Operating System - HP-UX

Memory usage

Fadia Almarei — Thu, 29 Dec 2011 12:16:27 GMT

Dear All

we have HP-UX 11.31 on rx6600 server , the server has 8GB RAM , running oracle 10g DB ,from top command and our monitoring tool (HP openview) and from oracle grib reports it shows that the server had full memory utilization , but when we check from swapinfo command and from what oracle SGA receives we have 45% used from memory only , we see something from oracle related to change kernel parameter filecache , but I checked that this parameter preferred to be the default , any suggestion related to have the real memory used , and should we change this parameter or what ?

BR;

Fadia Almarei

Re: Memory usage

Dennis Handly — Thu, 29 Dec 2011 12:23:44 GMT

What is the output of: swapinfo -tam

What are the values of filecache_max(5) and filecache_min(5)?

Re: Memory usage

Fadia Almarei — Sun, 15 Jan 2012 08:06:40 GMT

sorry for the da

Re: Memory usage

Aneesh Mohan — Thu, 19 Jan 2012 18:32:04 GMT

Hello,

The default values are

filecache_min: approximately 5% of physical memory

filecache_max: approximately 50% of physical memory

If your system is used for ORACLE DB only , you can reduce these values since Oracle use their own caching [ System Global Area ] mechanisim .

may be you can set

filecache_min: 2%

filecache_max: 5%

regards,

Aneesh

Re: Memory usage

safar — Mon, 04 Jun 2012 11:42:11 GMT

A part from memory other fact also need to check on the system

what is the value of vx_ninode

and time free lag

kctune | grep -i ninode

kctune | grep -i lag

for smooth running of hp-ux you need to tune your kernel and file system

Regards

Safar

salman.safar@gmail.com