Re: [Patch 0/2] blkiomon: I/O monitor based on blktrace data

[Martin Peschke <mp3@xxxxxxxxxx>]

On Wed, 2008-07-16 at 09:28 -0400, Alan D. Brunelle wrote:
> Martin Peschke wrote:
> > In order to analyse I/O performance problems which could be reported by
> > customers we want to provide a little monitoring tool. Primarily, we
> > would like to be able look at a history of request size and request
> > latency histograms per device.
> > 
> > The D and C traces provided by blktrace are exactly what we need for
> > that purpose. So, running blktrace with appropriate filters (-a option)
> > makes this approach feasible.
> > 
> > Patch 1/2 allows users to get binary output from blkparse on stdout.
> > 
> > Patch 2/2 contains blkiomon, an I/O monitoring tool, which reads
> > blkparse data from stdin and which periodically writes I/O statistics.
> > 
> > I would like to contribute this little tool to the blktrace source tree.
> > I think it would complement blkparse and btt quite well.
> > 
> > Martin
> 
> Hi Martin -
> 
> Is there some reason why you don't just parse the textual output from
> blkparse itself? [I believe that's what Chris Mason does w/ his
> seekwatcher for example.]

Hi Alan,
we would like to spend as few CPU cycles as possible.

Having a little c-program consuming binary data is less expensive than
having blkparse generate textual output which would be parsed by some
script.

This is a monitoring tool, and there might be millions of requests.

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