Re: 11g AMM tmpfs vs hugepages for best overall performance
- From: Kevin Closson <ora_kclosson@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 23 Jul 2010 10:03:19 -0700 (PDT)
>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.
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