Re: "Out of Memory: Killed process" errors on server running Oracle

We're still weighing the options on our end.  We plan on upgrading to the
update 9 kernel and seeing if that resolves anything.  Also we're adding
another server to the cluster to see if that helps alleviate the problem.

I'll post more info as we get farther along.

-Gene


On 7/17/07, Eric Sisler <esisler-gij/PdVOEVy0Ho0B3j/[email protected]> wrote:
>
> Hi Gene,
>
> >   Every 5-6 days I'm getting "Out of Memory: Killed process" messages
> > on a Redhat AS 3 server running Oracle 9.20.  These errors will occur
> > for a couple hours and will eventually lead to Oracle shutting down.
> > The load on the server did increase recently, but there's still 1.8GB
> > memory free on the system during these errors.
> >
> >   The box is running the smp kernel.  Should I do something like
> > increase the stack size or use the hugemem kernel?
>
> Were you able to find a fix or workaround to this problem?  I'm seeing
> the same thing on one of my VMware GSX/Server hosts.  This is apparently
> related to the out of memory process killer on 2.6.x kernel series - in
> some cases it appears to be a little too aggressive when memory gets
> low.  The behavior of the OOM process killer also changed between the
> 2.4.x & 2.6.x kernels.  From a VMware KB article:
>
> "...This problem results from a change in the way the Linux version 2.6
> kernel's OOM process killer works. In the version 2.4 kernel, the OOM
> process killer killed the process that requested more memory than could
> be provided. In version 2.6, this behavior changed so that the OOM
> process killer kills the largest active process, regardless of the
> process whose request exceeded available memory."
>
> In my case it's the VM with the largest virtual memory that get's killed
> when resources get tight.
>
> I'm still researching possible solutions.
>
> -Eric
>
> --
> Eric Sisler <esisler-gij/PdVOEVy0Ho0B3j/[email protected]>
> Library Network Specialist
> Westminster Public Library
> Westminster, CO USA
>
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