fddist(1m) USER COMMANDS fddist(1m)NAMEfddist - file descriptor usage distributions. Uses DTrace.
SYNOPSISfddist [-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.
EXITfddist will sample until Ctrl-C is hit.
SEE ALSOdtrace(1M)version 0.70 Jun 08, 2005 fddist(1m)