Re: when to use hugepages
- From: Robert Freeman <robertgfreeman@xxxxxxxxx>
- To: Dave.Herring@xxxxxxxxxx, jkstill@xxxxxxxxx, guillermo.bort@xxxxxxx
- Date: Tue, 21 Oct 2008 09:45:24 -0700 (PDT)
An interesting post by Kevin Closson on the topic ...
http://kevinclosson.wordpress.com/2007/08/23/oracle11g-automatic-memory-management-and-linux-hugepages-support/
Robert G. Freeman
Author:
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----- Original Message ----
From: Herring Dave - dherri <Dave.Herring@xxxxxxxxxx>
To: jkstill@xxxxxxxxx; guillermo.bort@xxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Sent: Tuesday, October 21, 2008 10:08:43 AM
Subject: RE: when to use hugepages
For a new set of servers, all 16 to 32GB RAM, I've asked that hugepages be used
(RHEL 4.x). But sys admin folks have warned that if I plan on upgrading to 11g
soon then we'd loose advantages of hugepages, due to MEMORY_MAX_TARGET and
MEMORY_TARGET with 11g. I know zero about 11g, so I'd prefer to hear from you
all. Is this true? If I have them set up hugepages then upgrade to 11g, do I
loose all performance gains with that feature?
Dave
___________________________________
Dave Herring, DBA | A c x i o m M I C S / C S O
630-944-4762 office | 630-430-5988 wireless | 630-944-4989 fax
________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Jared Still
Sent: Monday, October 20, 2008 1:52 PM
To: guillermo.bort@xxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: when to use hugepages
The following ML Notes may be helpful
361323.1
401749.1
397568.1
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
On Mon, Oct 20, 2008 at 7:30 AM, Bort, Guillermo <guillermo.bort@xxxxxxx> wrote:
Hi all,
After the thread about hugepages a while ago I became interested in them, and
told the SA about them. He said it's viable in most of our environments, so it
now lies with me to decide where to use hugepages. As I have no experience with
this, I'd very much appreciate any pointers as to how to decide whether to use
hugepages or not in a given environment. Also, if you know of a way to
'benchmark' de performance to have something to show the customer (as the
change would require some downtime). I think it goes without saying that this
will be tested in (redundantly enough) testing and QA environments way before
we even consider trying it in pre-productive and productive environmets.
Thanks in advanced
Guillermo Alan Bort
DBA / DBA Main Team
EDS, an HP company
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