topic kctune for filecache_max in Operating System - HP-UX

kctune for filecache_max

Timothy P. Jackson — Sun, 19 Jun 2011 02:38:57 GMT

Hello everyone,

I am looking to change the kernel parameter for filecache_max and filecache_min. If I use smh it tells me that it is an (Automatic) parameter. What is the correct syntax for kctune to change this. I want to change them to a fixed percentage.

filecache_min=5
filecache_max=13

System: rx3600
OS: HP-UX 11.31

Any help would be greatly appreciated!

Tim

Re: kctune for filecache_max

Dennis Handly — Sun, 19 Jun 2011 07:09:45 GMT

filecache_max(5) says you need to add a "%":
kctune filecache_min=5%
kctune filecache_max=13%

Re: kctune for filecache_max

Sajjad Sahir — Sun, 19 Jun 2011 09:17:11 GMT

Dear Friend

before doing just read it

It is recommended that these tunables are left in the automatic (default) state, to allow the system to better balance the memory usage among filesystem I/O-intensive processes and other types of processes.
Default

filecache_min: approximately 5% of physical memory

filecache_max: approximately 50% of physical memory

The defaults are computed and adjusted automatically, based on the amount physical memory on the system.

The current default value, when displayed by kctune, will be expressed as the current value used internally by the system (representing bytes). The displayed value will vary as the internal value is automatically adjusted.

The command is

# kctune filecache_min=10% filecache_max=13

thanks and regards

Sajjad Sahir

Re: kctune for filecache_max

Timothy P. Jackson — Sun, 19 Jun 2011 13:56:07 GMT

Thanks for your responses!

I have 16gig of physical memory so there is no way I need 8 gig of it taken up by filecache. I have tuned this down before, I just couldn't remember the correct syntax.

Thanks again!