osx man page for fddist

fddist(1m)							   USER COMMANDS							fddist(1m)

NAME
       fddist - file descriptor usage distributions. Uses DTrace.

SYNOPSIS
       fddist [-r|-w]

DESCRIPTION
       This  prints  distributions for read and write events by file descriptor, by process. This can be used to determine which file descriptor a
       process is doing the most I/O with.

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

OPTIONS
       -r     reads only

       -w     writes only

EXAMPLES
       Sample both read and write activity,
	      # fddist

       Sample reads only,
	      # fddist -r

FIELDS
       EXEC   process name

       PID    process ID

       value  file descriptor

       count  number of events

BASED ON
       /usr/demo/dtrace/lquantize.d

DOCUMENTATION
       DTrace Guide "Aggregations" chapter (docs.sun.com)

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

EXIT
       fddist will sample until Ctrl-C is hit.

SEE ALSO
       dtrace(1M)

version 0.70							   Jun 08, 2005 							fddist(1m)