topic Re: kernel tunables: filecache_min and filecache_max in Operating System - HP-UX

kernel tunables: filecache_min and filecache_max

George N — Wed, 13 Jan 2010 21:44:28 GMT

I'm running 11.31 in an HP-VM environment on an rx6600. I have recently set the filecache_min kernel tunable to 5% and filecache_max to 20% in an effort to control how much memory gets used for this purpose.

My question is how can I determine the actual filecache usage? It should of course be somewhere between 5% and 20% of total system memory, but how do I determine the actual current utilization?

TIA

Re: kernel tunables: filecache_min and filecache_max

Fabian Briseño — Wed, 13 Jan 2010 22:18:13 GMT

Hello George.

check the following threads out.

Hope they help.

http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1263420864155+28353475&threadId=1359459

http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1263421050229+28353475&threadId=1332985

Re: kernel tunables: filecache_min and filecache_max

Tim Nelson — Wed, 13 Jan 2010 22:45:30 GMT

# kcusage -h filecache_max
Tunable: filecache_max
Setting: 812886424
Time Usage %
=============================================
Wed 01/13/10 15:45 CST 406900736 50.1
Wed 01/13/10 15:50 CST 358998016 44.2
Wed 01/13/10 15:55 CST 365375488 44.9
Wed 01/13/10 16:00 CST 657281024 80.9
Wed 01/13/10 16:05 CST 638189568 78.5
Wed 01/13/10 16:10 CST 696365056 85.7
Wed 01/13/10 16:15 CST 497078272 61.1
Wed 01/13/10 16:20 CST 490786816 60.4
Wed 01/13/10 16:25 CST 476106752 58.6
Wed 01/13/10 16:30 CST 153149440 18.8
Wed 01/13/10 16:35 CST 129527808 15.9
Wed 01/13/10 16:40 CST 132292608 16.3

filecache_min is what it is..
kctune filecache_min

Re: kernel tunables: filecache_min and filecache_max

SoorajCleris — Thu, 14 Jan 2010 04:04:21 GMT

Hi,

This is the parameter which defines your file cache ( buffer cache parameters dbc_max min obsolete)

You can check from glance if you have ,

Go to memory report (m)
Then in bottom line you can see the current usage

Total VM : 1.5gb Sys Mem : 1.2gb User Mem: 341mb Phys Mem : 4.0gb
Active VM: 418mb Buf Cache: 0mb Free Mem: 2.3gb FileCache: 132mb

Regards,
Sooraj