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rwbytype.d(1)                   USER COMMANDS                  rwbytype.d(1)




NAME

       rwbytype.d - read/write bytes by vnode type. Uses DTrace.


SYNOPSIS

       rwbytype.d


DESCRIPTION

       This program identifies the vnode type of read/write activity - whether
       that is for regular files, sockets,  character  special  devices,  etc.
       This  is  measuring at the application level, so file activity may well
       be cached by the system.

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


EXAMPLES

       This samples until Ctrl-C is hit.
              # rwbytype.d



FIELDS

       PID    process ID

       CMD    process name

       VNODE  vnode type (describes I/O type)

       DIR    direction, Read or Write

       BYTES  total bytes



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

       rwbytype.d will sample until Ctrl-C is hit.


AUTHOR

       Brendan Gregg [Sydney, Australia]


SEE ALSO

       rwbypid.d(1M), rwbbypid.d(1M), dtrace(1M)




version 0.70                     Jan 11, 2006                   rwbytype.d(1)

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