fddist(1) USER COMMANDS fddist(1)
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 direc-
tory. 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(1)
Mac OS X 10.6 - Generated Thu Sep 17 20:07:36 CDT 2009