finding bottlenecks on ubuntu systems

[David Miller]

iostat - will show you what sort of IO operations are going on
vmstat - will show you whats happening in the memory management of the
system
top - will show you cpu activity broken down by processes

There is some overlap in the data from these tools but those are a good
place to start.

Other things that may be interesting to look into is what IO schedulers
you're using.  Deadline may be better for your workload than the default
CFQ.

To list the available io schedulers use this command.

cat /sys/block/sdb/queue/scheduler
This should return "noop anticipatory deadline [cfq]"

To change your scheduler to deadline use the following command on the
appropriate device.

sudo echo "deadline" > /sys/block/sdb/queue/scheduler
--
David

On Fri, Nov 13, 2009 at 9:14 AM, Mark van Harmelen <
markvanharmelen at gmail.com> wrote:

> Hi everyone
>
> I've never done this before so all hints would be gratefully received.
>
> We are running a 9.04 server, with a single unthreaded process that is of
> interest, basically one that is busy transforming the contents of a mysql
> db. I want to find out if we can improve the performance of this process.
>
> Seems potential limitations are
>
> - limited by CPU speed
> - limited by access to mysql data on disc
> - limited by memory size, and therefore spending its time paging
>
> I'm wondering if anyone has any great commands  and/or command options for
> me to start my investigations with, please.
>
> Or any strategies, words of advice, or (instructional) sources that you
> found useful in tuning your own systems.
>
> thanks
> mark
>
>
>
>
>
>
>
> --
> ubuntu-server mailing list
> ubuntu-server at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/ubuntu-server
> More info: https://wiki.ubuntu.com/ServerTeam
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-server/attachments/20091113/7e371e05/attachment.html>