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