FW: 11g RedHat 5 and Hugepages? anybody successful ?

From: "Crisler, Jon" <Jon.Crisler@xxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Date: Mon, 11 Oct 2010 17:17:30 -0400
Don- I think this covers what you were looking for-  I think our earlier
emails crossed paths.

 

cat /proc/meminfo | grep uge

HugePages_Total: 35000

HugePages_Free:  35000

HugePages_Rsvd:      0

Hugepagesize:     2048 kB

 

#vm.nr_hugepages=0

vm.nr_hugepages=35000

 

# End of file

oracle soft nproc 2047

oracle hard nproc 16384

oracle soft nofile 1024

oracle hard nofile 65536

#* hard memlock 83886080 

#* soft memlock 83886080 

* hard memlock 83886080 

* soft memlock 83886080

 

[root@m218176dcss3001 ~]# ipcs -m

 

------ Shared Memory Segments --------

key        shmid      owner      perms      bytes      nattch     status


0xe7553358 32768      oracle    660        4096       0


0x09907c08 720897     oracle    660        4096       0   

 

From: Don Seiler [mailto:don@xxxxxxxxx] 
Sent: Monday, October 11, 2010 5:06 PM
To: Crisler, Jon
Cc: Jared Still; oracle-l@xxxxxxxxxxxxx
Subject: Re: 11g RedHat 5 and Hugepages? anybody successful ?

 

If you have HugePages properly configured, then these parameters aren't
required.

 

From note 361468.1:

 

        On Linux and some other platforms the Oracle Database
initialization parameters PRE_PAGE_SGA and LOCK_SGA3  can be set to TRUE
to pin the SGA pages into memory. HugePages already makes the SGA pages
non-swappable, so those parameters are not needed to have SGA pages
unswappable. But those parameters still can provide additional
performance advantages for the internal mechanism of Oracle Database
memory management.

 

I'd like to see the output of these 4 commands:

 

grep Huge /proc/meminfo

grep huge /etc/sysctl.conf

grep memlock /etc/security/limits.conf

ipcs -m 

 

On Mon, Oct 11, 2010 at 3:53 PM, Crisler, Jon <Jon.Crisler@xxxxxxx>
wrote:

Jared- both lock_sga and pre_page_sga are set to FALSE.

 

From: Jared Still [mailto:jkstill@xxxxxxxxx] 
Sent: Monday, October 11, 2010 3:54 PM
To: Crisler, Jon


Subject: Re: 11g RedHat 5 and Hugepages? anybody successful ?

 

Jon,

 

Do you have the LOCK_SGA and PRE_PAGE_SGA parameters set?


Jared 

On Mon, Oct 11, 2010 at 10:59 AM, Crisler, Jon <Jon.Crisler@xxxxxxx>
wrote:

I have been trying to get hugepages working on 11gR1 without success.
Has anybody been able to get this to work properly? In order to use
hugepages, you have to turn off 11g ASMM which uses the /dev/shm memory
mapping.

Hugepages are configured properly in OS, /etc/security/limits.conf
updated for hugepages.  If I attempt to set memory_target  and
memory_max_target to zero (or reset them) then I get ORA-00849
SGA_TARGET ### cannot be set to more than MEMORY_MAX_TARGET.  I am
following technote 749851.1, and even opened a support case with Oracle,
and I am not getting anywhere.

Any clues as to what I am missing?  Thanks- Jon
--
//www.freelists.org/webpage/oracle-l

 




-- 
Don Seiler
http://seilerwerks.wordpress.com
ultimate: http://www.mufc.us
FW: 11g RedHat 5 and Hugepages? anybody successful ?

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