RE: Linux and huge pages
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxx>
- To: "JC1706@xxxxxxx" <JC1706@xxxxxxx>, oracle-l <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 23 Jan 2013 08:47:50 -0500
Very cool. I wasn't aware of the 'AUTO' option. I'll need to play around with
that one!
Unfortunately, if you're looking to directly confirm whether a particular
memory segment was allocated with hugepages, I know of no way to do that.
I think it's probably possible, but I can't think of how.
You can look at /proc/meminfo, and see how many hugepages are allocated system
wide, and how many of them are in use.
You can look at alert.log to see if hugepages were used (and how many) when the
instance was started.
You can look at 'sysresv' (in $ORACLE_HOME/bin) to see which memory segments
are associated with a specific instance.
Hope that helps,
-Mark
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of CRISLER, JON A
Sent: Tuesday, January 22, 2013 6:59 PM
To: oracle-l
Subject: Linux and huge pages
We are trying to come up with a script to troubleshoot hugepages setup in
Linux. I see there is a parameter for USE_LARGE_PAGES which in 11.2.0.3 has 4
different values:
True - use huge pages if available, otherwise use regular mem
False- don't use huge pages
Only- only use huge pages, and if huge pages are not sufficient, throw an error
and shutdown instance.
Auto- new in 11.2.0.3 - use oradism to reconfigure kernel to allocate huge pages
(this is a subset of Oracle Support technote 1392497.1).
My question- is there a view or a method to determine where oracle is actually
using the huge pages ? Something besides sysctl or cat /proc/meminfo, ideally
similar to v$sgainfo.
--
//www.freelists.org/webpage/oracle-l
--
//www.freelists.org/webpage/oracle-l
Other related posts:
