RE: Hugepages question with multiple instances on 1 host

From: Hameed, Amir <Amir.Hameed_at_xerox.com>
Date: Tue, 30 Apr 2013 11:24:31 +0000
Message-ID: <AF02C941134B1A4AB5F61A726D08DCED0AF6722A_at_USA7109MB012.na.xerox.net>

There is no special configuration required in Solaris. The "_use_ism" (Intimate Shared Memory) parameter defaults to "TRUE" on Solaris and when it is set, the OS kernel implicitly locks the SGA into memory.

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Nuno Souto Sent: Tuesday, April 30, 2013 6:27 AM
To: oracle-l_at_freelists.org
Subject: Re: Hugepages question with multiple instances on 1 host

I understand it is provided in Solaris. Question is: how automatic is it then?
As in: all Oracle instances grab 4M pagesize for SGA? Or does the Oracle executable have to be pre-configured with the wanted size using ppgsz(1)?
Is 4M the default size? And is there an option to say some instances use larger page sizes, some don't?

-- 
Cheers
Nuno Souto
dbvision_at_iinet.net.au



On 30/04/2013 7:04 PM, Radoulov, Dimitre wrote:


> On 30/04/2013 09:28, Nuno Souto wrote:

>> [...]

>> Wonder if someone with Solaris experience on this could come up with a

>> similar page so we got most *n*xes covered?

> With Solaris it should be automatic,

> see www.solarisinternals.com/wiki/index.php/Multiple_Page_Size_Support

> and www.linkedin.com/groups/Solaris-Huge-pages-60651.S.78812448.

>

> Oracle 11.2 on Solaris 10 (the Pgsz column):

>

> $ uname -sr

> SunOS 5.10

> $ pmap -sx 10693 | nawk 'NR == 2 || $6 ~ /[MG]/'

>            Address     Kbytes        RSS       Anon     Locked Pgsz

> Mode   Mapped File

> 0000000100000000     151552     151552          -          -   4M r-x--

> oracle

> 0000000109C00000      36864      36864          -          -   4M r-x--

> oracle

> 0000000380000000    2097152    2097152          -    2097152  -2G

> rwxsR    [ ism shmid=0x47000064 ]

> 0000000400000000    1048576    1048576          -    1048576 256M

> rwxsR    [ ism shmid=0x47000064 ]

> FFFFFFFF7D800000       4096       4096          -          -   4M r-x--

> libhasgen11.so

>

>


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Received on Tue Apr 30 2013 - 13:24:31 CEST