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kernel tunables: filecache_min and filecache_max

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George N
Advisor

kernel tunables: filecache_min and filecache_max

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
3 REPLIES
Fabian Briseño
Esteemed Contributor

Re: kernel tunables: filecache_min and filecache_max

Tim Nelson
Honored Contributor
Solution

Re: kernel tunables: filecache_min and filecache_max

# 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

SoorajCleris
Honored Contributor

Re: kernel tunables: filecache_min and filecache_max

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
"UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity" - Dennis Ritchie