Ocfs2 users - Nov 2006 - out of memory problem concerning 64-bits?

Hello,
we are currently running in production the system based on Redhat 
Enterprise Linux 4 Update 3, ver. 32-bits. We are periodically 
encountering an OOM-killer problem. Problem was discussed in previous posts.

I have a question: does it concern only 32-bits systems or 64-bits as well?
On 32-bits system OCFS2 driver consumes Low Memory (only ~900 MB) and 
therefore causes oom-kills. What about 64-bits systems? Does it consume 
all memory available for system (in my case: 8 GB)  and therefore it 
takes much longer to encounter oom-kills?

It is a very important issue for me and a response would be greatly 
appreciated.

Regards
Michal Wilkowski

Are you sure it is ocfs2 that is eating memory?

# egrep 'ocfs|dlm|size-256 |size-32 ' /proc/slabinfo
# cat /proc/fs/ocfs2_dlm/*/stat

Email the outputs.

Micha? Wilkowski wrote:
> Hello,
> we are currently running in production the system based on Redhat 
> Enterprise Linux 4 Update 3, ver. 32-bits. We are periodically 
> encountering an OOM-killer problem. Problem was discussed in previous 
> posts.
>
> I have a question: does it concern only 32-bits systems or 64-bits as 
> well?
> On 32-bits system OCFS2 driver consumes Low Memory (only ~900 MB) and 
> therefore causes oom-kills. What about 64-bits systems? Does it 
> consume all memory available for system (in my case: 8 GB)  and 
> therefore it takes much longer to encounter oom-kills?
>
> It is a very important issue for me and a response would be greatly 
> appreciated.
>
> Regards
> Michal Wilkowski
>
> _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users@oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-users

I run 2 OCFSv2 clusters on SLES9 SP3 (last update) on x86_64, and never saw
something like OOM.

Through, when I tested it under a heavy load (I run it on a light load now,
putting heavy load onto traditional ReiserFS and heartbeat cluster),
I noticed extreme CPU usage of the OCFS2 (but never saw memory usage).

(But SLES9 have improved OCFS2 drivers, as I know. Anyway, lOCFSv2 in the
last SLES9 update looks pretty stable. I never installed OCFS2 from
sources to keep system consistant, and it shows some results).


----- Original Message ----- 
From: "Micha? Wilkowski" <michal.wilkowski@wolainfo.com.pl>
To: <ocfs2-users@oss.oracle.com>
Sent: Monday, November 13, 2006 11:36 AM
Subject: [Ocfs2-users] out of memory problem concerning 64-bits?

> Hello,
> we are currently running in production the system based on Redhat
> Enterprise Linux 4 Update 3, ver. 32-bits. We are periodically
> encountering an OOM-killer problem. Problem was discussed in previous
posts.
>
> I have a question: does it concern only 32-bits systems or 64-bits as
well?
> On 32-bits system OCFS2 driver consumes Low Memory (only ~900 MB) and
> therefore causes oom-kills. What about 64-bits systems? Does it consume
> all memory available for system (in my case: 8 GB)  and therefore it
> takes much longer to encounter oom-kills?
>
> It is a very important issue for me and a response would be greatly
> appreciated.
>
> Regards
> Michal Wilkowski
>
> _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users@oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-users
>