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Plan 9 - man page for iostats (plan9 section 4)

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IOSTATS(4)									       IOSTATS(4)

       iostats - file system to measure I/O

       iostats cmd [ args...  ]

       Iostats is a user-level file server that interposes itself between a program and the regu-
       lar file server, which allows it to gather statistics of file system use at the	level  of
       the  Plan  9 file system protocol, 9P.  After a program exits a report is printed on stan-
       dard error.

       The report consists of three sections.  The first section reports the amount of user  data
       in  read and write messages sent by the program and the average rate at which the data was
       transferred.  The protocol line reports the amount of data sent as message  headers,  that
       is, protocol overhead.  The rpc line reports the total number of file system transactions.

       The  second  section  gives the number of messages, the fastest, slowest, and average turn
       around time and the amount of data involved with each 9P message type.  The final  section
       gives  an  I/O  summary	for  each  file  used by the program in terms of opens, reads and


       Poor clock resolution means that large amounts of I/O must be done to  get  accurate  rate

       Can be fooled by programs that do fresh mounts outside its purview.

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