[Lustre-discuss] How to determine which lustre clients are loading filesystem.

[Wojciech Turek]

Thank you all for very useful suggestions. The Andreas's way which uses
rpc_history gave out exactly what I was looking for in a quite easy to read
form.

On 9 July 2010 18:26, Andreas Dilger <andreas.dilger at oracle.com> wrote:

> On 2010-07-08, at 16:11, Bernd Schubert wrote:
> >> Bernd, would you (or anyone) be interested to enhance those tools to be
> able to show stats data from multiple files at once (each prefixed by the
> device name and/or client NID)?  I don't think it makes sense to create
> separate tools for this.
> >
> > I'm not sure if the existing lustre tools are really what we need. If you
> have a cluster with 200 or more clients and then want to figure out which
> clients are doing most IO, several lines per client provide too much output.
>
> I agree, but having a 200-column line is also not very useful.  I like the
> "llobdstat" output where it prints the IO numbers, and then appends only the
> abbreviated values that are changing for that interval, instead of printing
> all of the values.
>
> > One line sorted by IO seems to be better, IMHO.
>
> The commands that I posted using the rpc_history file will print out a
> summary of all client RPC counts sorted by maximum user.  Something similar
> could be done by aggregating all of the per-client stats as well, though it
> would mean touching a lot more input files for each interval.
>
> > I would be for interested to enhance the existing tools, but then if I
> look into the number of open bugs I have, several of those have a higher
> priorty (btw, this script is among my bug list (bug 22469)).
>
> I was actually hoping that someone else might take it up.  The llstat and
> llobdstat scripts are perl, and there should be a good number of people who
> could do a bit of perl hacking.
>
> The scripts are currently "vmstat" or "iostat" like, in that they print out
> the parameters as they change over time.  It might also be interesting (if
> someone has the perl-fu to do it) to have a "top" mode, where it resets the
> screen position each time and sorts the output from all of the clients.
>
> Cheers, Andreas
> --
> Andreas Dilger
> Lustre Technical Lead
> Oracle Corporation Canada Inc.
>
>


-- 
--
Wojciech Turek
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