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rwsnoop(1)                      USER COMMANDS                     rwsnoop(1)




NAME

       rwsnoop - snoop read/write events. Uses DTrace.


SYNOPSIS

       rwsnoop [-jPtvZ] [-n name] [-p PID]


DESCRIPTION

       This  is  measuring  reads  and  writes  at the application level. This
       matches the syscalls read, write, pread and pwrite.

       Since this uses DTrace, only users with root privileges  can  run  this
       command.


OPTIONS

       -j     print project ID

       -P     print parent process ID

       -t     print timestamp, us

       -v     print time, string

       -Z     print zone ID

       -n name
              process name to track

       -p PID PID to track



EXAMPLES

       Default output,
              # rwsnoop

       Print zone ID,
              # rwsnoop -.Monitor processes named "bash", # rwsnoop -n bash



FIELDS

       TIME   timestamp, us

       TIMESTR
              time, string

       ZONE   zone ID

       PROJ   project ID

       UID    user ID

       PID    process ID

       PPID   parent process ID

       CMD    command name for the process

       D      direction, Read or Write

       BYTES  total bytes during sample

       FILE   filename,  if  file  based.   Reads and writes that are not file
              based, for example with sockets, will print "<unknown>"  as  the
              filename.



DOCUMENTATION

       See  the  DTraceToolkit for further documentation under the Docs direc-
       tory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.


EXIT

       rwsnoop will run forever until Ctrl-C is hit.


AUTHOR

       Brendan Gregg [Sydney, Australia]


SEE ALSO

       rwtop(1M), dtrace(1M)




version 0.70                     Jul 24, 2005                      rwsnoop(1)

Mac OS X 10.6 - Generated Thu Sep 17 20:09:05 CDT 2009
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