nfsstat --sleep=#

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I'd really like to have a way to output the nfsstat counters at regular intervals (every 3 seconds) where the output is the difference between 3 seconds ago and now. Frequently I'll run a test and want to watch the nfs call profile throughout the course of the test.

Does something like this already exist?
Are there objections to seeing a feature like this?

I'm thinking something like:
nfsstat --sleep=1

 nfs v3 call:   Server   Client
       total:        0     3476
        null:        0        0
     getattr:        0     1679
     setattr:        0        0
      lookup:        0      839
      access:        0      839
    readlink:        0        0
        read:        0        0
       write:        0        0
      create:        0        0
       mkdir:        0        0
     symlink:        0        0
       mknod:        0        0
      remove:        0        0
       rmdir:        0        0
      rename:        0        0
        link:        0        0
     readdir:        0        0
 readdirplus:        0        0
      fsstat:        0      119
      fsinfo:        0        0
    pathconf:        0        0
      commit:        0        0

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