rwsnoop(1m) USER COMMANDS rwsnoop(1m)

NAME
       rwsnoop - snoop read/write events. Uses DTrace.

SYNOPSIS
       rrwwssnnoooopp [-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  the  root  user  or  users  with  the
       dtracekernel privilege can run this command.

OOPPTTIIOONNSS
       -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


EEXXAAMMPPLLEESS
       Default output,
              # rrwwssnnoooopp

       Print zone ID,
              # rrwwssnnoooopp -.TMPonitor processes named "bash", # rrwwssnnoooopp -n bash


FFIIEELLDDSS
       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 ""  as  the
              filename.


DDOOCCUUMMEENNTTAATTIIOONN
       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.

EEXXIITT
       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(1m)