Re: linux memory settings on OL 6.2 ( red hat compatible )
Date: Mon, 10 Sep 2012 18:58:49 +0000 (UTC)
Message-ID: <pan.2012.09.10.18.58.48_at_gmail.com>
On Mon, 10 Sep 2012 01:16:14 -0700, Matthias Hoys wrote:
> Mladen,
>
> Are there any tools to measure/tune the performance impact of these VM
> subsystem settings? Do you have any idea what the performance gain can
> be on a optimal configured system with Oracle running on it?
>
> Thanks,
> Matthias http://matthiashoys.wordpress.com
Mathias, the only tools available are the Linux tools that measure the
consumption of Linux resources. Those are the usual suspects: top, sar,
iostat, vmstat, dstat, atop and iotop, the last one being available only
on RH 6.x kernels.
I was solving problems on case by case basis and it has always included
other things as well, like using direct IO, putting the database on ASM
and alike. Those, however, are palliative measures and I would be
unwilling to attribute any significant savings to them. I still have to
play with chrt and make LGWR a real-time process to see whether that makes
any palpable difference.
As a holistic, soul searching measures, setting this parameters makes
sense, at least in my eyes, despite the fact that I don't have any numbers
to back my advice.
-- Mladen Gogala http://mgogala.freehostia.comReceived on Mon Sep 10 2012 - 13:58:49 CDT