SUMMARY: Solaris 10 Scheduling question

Hi,

The consensus is to use FSS and the justification is below. There was
one response against it but I did not receive feedback on what the
technical reasons were as yet.

Thanks greatly to:
Aleks Feltin
Francisco Roque

Regards
Sugan Moodley

-----Original Message-----
From: francisco roque
Sent: 20 November 2008 07:54 AM
To: Moodley, Sugan S
Subject: Re: Solaris 10 Scheduling question

We allocate a number of shares foreach zone based on its priority.
Let's say a machine has 5 zones, of which 2 are production, 2 are
development and 1 is the global.  Let's also say that 1 of those
production zones is more important than the other.  In that case we
would divvy it up as:

200 shares to global
100 shares to important production zone
50 shares to less important production zone 10 shares to each
development zone

We give the global much more since if something goes wrong with the
local zones (e.g. processes spinning out of control), we need to get on
the globabl to fix the issue.

In theory you can become much more fine-grained than this, in practice
using this standard works ok for us.

Also i highly recommend moving to FSS.  We've had a couple cases where
performance improved a lot, even on machines that weren't taxed before.

Good luck,

-f

-----Original Message-----
From: Aleks Feltin
Sent: 19 November 2008 10:58 AM
To: Moodley, Sugan S
Subject: Re: Solaris 10 Scheduling question

Hi Sugan,

Here is a link for blog resource covering both theory and implementation
- http://number9.hellooperator.net/articles/2007/04/14/thinking-cap

This should provide answers to your questions.

regards,

Aleks F.

On 19/11/08 10:20 +0200, Moodley, Sugan S wrote:
>Hi,
>
>I have various releases of Solaris 10 running zones on SPARC hardware.
>Recently we have been advised to change our scheduler from the default
>Time Based scheduling to Fair Share Scheduler on the grounds that it is

>"better" than the default.
>
>The documentation on this subject is very complex and docs.sun.com does

>not give real world examples.
>
>What would be the best way to use this FSS and TM ?
>
>Thank you kindly,
>Sugan Moodley
>UNIX sysadm

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