RE: 11g RedHat 5 and Hugepages
- From: "Crisler, Jon" <Jon.Crisler@xxxxxxx>
- To: "Kevin Closson" <ora_kclosson@xxxxxxxxx>, <tgascard@xxxxxxxxx>
- Date: Tue, 12 Oct 2010 14:33:45 -0400
Actually Kevin- I ran across your updated blog posts on hugepages last
night and was reading them twice J So far I have not found any silver
bullet. One of my coworkers was speculating that it might have
something to do with ASM- we are running a mixed 11.2 ASM/CRS with 11.1
db config (due to compatibility issues with the app). My opinion is
that it would not matter- either ASM is in huge page memory, or its not-
as long as there is memory to support it I think it would not matter.
The libnuma symlinks are new to me, I was unaware of any issues.
From: Kevin Closson [mailto:ora_kclosson@xxxxxxxxx]
Sent: Tuesday, October 12, 2010 2:27 PM
To: Crisler, Jon; tgascard@xxxxxxxxx
Cc: Oracle-L@xxxxxxxxxxxxx
Subject: Re: 11g RedHat 5 and Hugepages
hugetlb_shm_group is not needed on Red Hat
Have you googled to see whether I've already blogged the solution to you
problem?
If you are on 11.1 you probably don't have the libnuma symlinks right.
If you can't find it with google let me know
Also, this notion that 32bit OS deployments don't need hugepages is
quite wrong. Any system with large connection count is not going to be
able to afford the wasted page table memory.
Use hugepages.
________________________________
From: "Crisler, Jon" <Jon.Crisler@xxxxxxx>
To: tgascard@xxxxxxxxx
Cc: Oracle-L@xxxxxxxxxxxxx
Sent: Tue, October 12, 2010 7:45:03 AM
Subject: RE: 11g RedHat 5 and Hugepages
This is pretty much what I am doing, however the parameter-
vm.hugetlb_shm_group=1300
- I am under the impression that this does not apply to RedHat 5, only
to SUSE and a few other varients.
Can anybody that has done this on RedHat 5 verify if this parameter is
needed in /etc/sysctl.conf ?
-----Original Message-----
From: tgascard@xxxxxxxxx [mailto:tgascard@xxxxxxxxx]
Sent: Tuesday, October 12, 2010 3:48 AM
To: Crisler, Jon
Cc: Oracle-L@xxxxxxxxxxxxx
Subject: 11g RedHat 5 and Hugepages
Hi,
I did it and is working perfectly well.
My configuration :
Not Using AMM with ASM and database
/etc/sysctl.conf :
vm.nr_hugepages= 12288 -- page size 2MB => 24 GB
vm.hugetlb_shm_group=1300 --id dba, be careful if it's a different user
between ASM and Database
kernel.shmmax=25769803776 -- => 24 GB
kernel.shmall=6291456 -- page size 4KB =>24 GB
/etc/security/limits.conf :
memlock=25165824 -- KB => 24 GB
/etc/profile
ulimit -u 16384 -n 65536 -l 25165824
To check you are using Huge Page
grep Huge /proc/meminfo
I hope it 'will help.
Thierry.
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