Re: 11g AMM tmpfs vs hugepages for best overall performance

Do we need huge pages with  64 bit Oracle?

On 23 July 2010 18:03, Kevin Closson <ora_kclosson@xxxxxxxxx> wrote:

> >does not have any performance conclusions
>
> It's a capacity issue more than a performance issue. However, if you run
> out of capacity your performance will be impacted. Don't confused Linux
> hugepages with most of the Unix derivations that implement huge pages with
> shared page tables. Shared page tables is a performance feature.
>
>
> http://kevinclosson.wordpress.com/kevin-closson-index/2009/07/28/quantifying-hugepages-memory-savings-with-oracle-database-11g/
> BTW, 11gR1? Really?
>
>
>  ------------------------------
> *From:* "Crisler, Jon" <Jon.Crisler@xxxxxxx>
> *To:* D'Hooge Freek <Freek.DHooge@xxxxxxxxx>; oracle-l@xxxxxxxxxxxxx
> *Sent:* Thu, July 22, 2010 4:51:47 PM
>
> *Subject:* RE: 11g AMM tmpfs vs hugepages for best overall performance
>
> Thanks- I saw this blog, but he does not have any performance conclusions
> on hugepages vs. 11g AMM for larger systems.  On smaller, 32 bit systems
> there was no clear winner.
>
> -----Original Message-----
> From: D'Hooge Freek [mailto:Freek.DHooge@xxxxxxxxx]
> Sent: Wednesday, July 21, 2010 12:11 PM
> To: Crisler, Jon; oracle-l@xxxxxxxxxxxxx
> Subject: RE: 11g AMM tmpfs vs hugepages for best overall performance
>
> Jon,
>
> Yes, you can still pick between AMM and "normal" memory parameters.
> For the comparison, I suggest you look at the following blogpost of Kevin
> Closson:
> http://kevinclosson.wordpress.com/2007/08/23/oracle11g-automatic-memory-management-and-linux-hugepages-support/
>
>
> Regards,
>
>
> Freek D'Hooge
> Uptime
> Oracle Database Administrator
> email: freek.dhooge@xxxxxxxxx
> tel +32(0)3 451 23 82
> http://www.uptime.be
> disclaimer: www.uptime.be/disclaimer
> ________________________________________
> From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> On Behalf Of Crisler, Jon
> Sent: woensdag 21 juli 2010 18:03
> To: oracle-l@xxxxxxxxxxxxx
> Subject: RE: 11g AMM tmpfs vs hugepages for best overall performance
>
> And a follow up question- if I implement a large /tmpfs - shm, I can still
> use choose to not use AMM and use hugepages, correct ?
>
> From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> On Behalf Of Crisler, Jon
> Sent: Wednesday, July 21, 2010 11:57 AM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: 11g AMM tmpfs vs hugepages for best overall performance
>
> Which is better for performance on large Red Hat 5 systems (64gb+ memory,
> 8+ cpu's) -  using 10g style shm settings and hugepages, OR the newer 11g
> Automatic Memory Manager (which does not support hugepages).
>
> The system I am building is a 6 node 11g R1 RAC, memory somewhere between
> 64gb and 256gb (not sure yet), 8 cpu per node.  This machine will support a
> huge workload.
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>
>


-- 
Howard A. Latham

Sent from my Nokia N97

Other related posts: