From: Garrick Staples <garrick@usc.edu>
Subject: Re: [PATCH] NFS: Zeroing NFS and kNFSD stats
Date: Tue, 13 Jul 2004 14:09:50 -0700
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20040713210950.GB22659@polop.usc.edu>
References: <40F3D483.8020507@RedHat.com> <20040713143044.GA3023@fieldses.org> <40F3FAD8.7090707@RedHat.com> <20040713151759.GC3023@fieldses.org> <20040713180108.GF3023@fieldses.org>
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On Tue, Jul 13, 2004 at 02:01:08PM -0400, J. Bruce Fields alleged:
> On Tue, Jul 13, 2004 at 11:17:59AM -0400, J. Bruce Fields wrote:
> > On Tue, Jul 13, 2004 at 11:08:08AM -0400, Steve Dickson wrote:
> > > Starting up a test run, zeroing out the stats give you a very clear
> > > picture of what exactly is going on...
> >=20
> > But you could exactly the same thing by recording the values at the
> > beginning of the test run and then subtracting.  In practice this is
> > likely to be annoying, so you'd want to write utilities that did this
> > for you, like say
> >=20
> > checkpoint_stats stats.txt
> > display_stats --since stats.txt
> >=20
> > That'd do what you want, right?
>=20
> The problem I have, by the way, is that zeroing is going to cause
> confusing problems whenever there are two simultaneous attempts to
> collect statistics.
>=20
> For example, imagine that your NFS server has a persistent
> performance-monitoring daemon that checks the statistics every now and
> then and emails the adminstrator a summary once a week.

It's about choice, isn't it?  Some sites may want to maintain the same numb=
ers
over time, other sites might want to zero them.

If someone zeros the numbers and messes up something else, that's the admin=
's
perogative to break things.

--=20
Garrick Staples, Linux/HPCC Administrator
University of Southern California

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