Re: [PATCH 0/7] nfsstat: adding -D/--diff-stat to nfsstat

[Trond Myklebust <trond.myklebust@fys.uio.no>]

On Wed, 2007-08-01 at 13:48 -0400, david m. richter wrote:
> On Wed, 1 Aug 2007, Trond Myklebust wrote:
> 
> > On Wed, 2007-08-01 at 13:35 -0400, david m. richter wrote:
> > > > Can I make one more attempt to interest someone in implementing the
> > > > --since=baseline-file approach?  It'd be fun, and would make some more
> > > > flexible use cases very simple.  You could still get a time interval:
> > > > 
> > > > 	nfsstat >tmp
> > > > 	sleep 30
> > > > 	nfsstat --since=tmp
> > > > 
> > > > or you could do other stuff:
> > > > 
> > > > 	nfsstat >tmp
> > > > 	run-my-weird-test-case-here
> > > > 	nfsstat --since=tmp
> > 
> > Exactly. Being able to zero out the stats is way more flexible than the
> > -D stuff...
> 
> 	perhaps i don't follow: how is zeroing the stats address the same 
> use-case as --diff-stat/--sleep?  one can already zero the stats by 
> unmounting, e.g., but that's a pain.  ?  i'm missing something.

You can emulate the --sleep stuff using a simple script:

while true
do
	nfsstat >tmp
	sleep 30
	nfsstat --since=tmp
done

Actually, you can do better if you also introduce an '--input' command
which causes nfsstat to read from a file instead of reading
from /proc/net/rpc/nfs and /proc/net/rpc/nfsd. That could be used to
eliminate a race in the above using something like the following script
to return client diff output.

cat /proc/sys/rpc/nfs >prev
while true
	sleep 30
	cat /proc/sys/rpc/nfs >new
	nfsstat -c --since=prev --input=new
	mv new prev
done

Unfortunately the client and server raw formats differ, so you probably
need to require the user to specify '-c' and '-s' in order to tell
nfsstat what kind of file you are giving it.

Trond


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