Re: [PATCH] NFS: Zeroing NFS and kNFSD stats

[Greg Banks <gnb@sgi.com>]

On Wed, Aug 04, 2004 at 04:14:11PM -0400, J. Bruce Fields wrote:
> On Mon, Aug 02, 2004 at 12:39:05PM +0200, Olaf Kirch wrote:
> > On Tue, Jul 13, 2004 at 11:17:59AM -0400, J. Bruce Fields wrote:
> > But it sucks. I had folks run something like 12-15 performance
> > measurements and take the NFS stats, and it was a huge mess to sort
> > through.  Telling folks "use nfsstat -z to wipe stats before each
> > command" is much easier.
> 
> Well, like I say, we could implement "nfsstat -z" by checkpointing as
> above but just writing to a file at some default path, though admittedly
> the choice of path might not be obvious.

FWIW, futzing with zeroing or checkpointing should not be necessary
on Altix systems because they ship with PCP, a stats gathering
package which samples the NFS stats (among many others) and does
rate conversion.

http://oss.sgi.com/projects/pcp/

> Having nfsstat just hang around till it's signaled (like tcpdump does)
> would also be easy.

IRIX' nfsstat has a -C option which uses curses to display every 1
sec the rates of various NFS stats, until interrupted.  It's a bit
like "watch nfsstat" but shows rate converted numbers instead of
changing counters.  Here's an example screen, for a machine getting
30 RPC calls/sec:



 4: Server   snort    Aug  5 15:21:21                           D: Delta/second

Server RPC:
calls      badcalls   nullrecv   badlen     xdrcall    duphits    dupage
30         0          0          0          0          0          40086.17

Server NFS V3:
calls        badcalls
30           0
null         getattr      setattr      lookup       access       readlink
1  0%        10 33%       1  2%        16 52%       1  0%        0  0%
read         write        create       mkdir        symlink      mknod
2  4%        1  3%        0  0%        0  0%        0  0%        0  0%
remove       rmdir        rename       link         readdir      readdir+
0  0%        0  0%        0  0%        0  0%        0  0%        0  0%
fsstat       fsinfo       pathconf     commit
1  1%        0  0%        0  0%        1  2%  

1: Client[V2]  2: Server[V2]  3: Client[V3]  4: Server[V3] 5: Daemons  DZR:mode



Something like that might be more useful than the -z option.


Greg.
-- 
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.


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