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From: Matthew Nuzum (matt.followers_at_gmail.com)
Date: Fri 01 Apr 2005 - 19:23:00 BST


> On Thu, Mar 31, 2005 at 09:22:10PM -0600, Matthew Nuzum wrote:
> > I think I can create a test case for this. I have a server that is not
> > currently running any vserver stuff that will be ok with a reboot now
> and
> > then.
>
> sounds good, please try to get 1.9.5.5 working there,
> because it already contains some blkio accounting
> and it would be very interesting to monitor those
> values ... (maybe with rrdtools)
>
> TIA,
> Herbert

I'm still doing my month-end backup, but when that's done I'll start
installing the vserver 1.9.5.5.

Here is the test case that seems most logical to me, but advice on how to
actually do concrete tests would be useful.

1. Create two vservers (vsa and vsb), start both.
2. In vsa start some heavily i/o intensive operation
3. In vsb try to do some tasks and notice how much i/o bandwidth I have
available.

Alternative plan:
1. Create 1 vserver and start it
2. In the vserver, start some heavily i/o intensive operation
3. In the host server try to do some tasks and notice how much i/o bandwidth
I have available
4. After step 2 completes, in host server start a heavily i/o intensive
operation
5. In vserver, try to do some tasks and notice how much i/o bandwidth I have
available

I have two ideas on heavily i/o intensive operation
1. I have a database with 35 million records. Doing any aggregate function
such as max() requires several sequential scans and takes a significant
amount of time.
2. Preparing my month end backup requires copying 13 GB of data.

Any other suggestions?

Question:
I have only subjectively noticed a dramatic decrease in server performance
when a vserver is performing i/o intensive tasks. How can I objectively
measure and produce concrete numbers?

-- 
Matthew Nuzum <matt_at_followers.net>
www.followers.net - Makers of "Elite Content Management System"
View samples of Elite CMS in action by visiting
http://www.followers.net/portfolio/

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