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

fddist - file descriptor usage distributions. Uses DTrace.

fddist [-r|-w]

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.

reads only
writes only

# fddist
# fddist -r

process name
process ID
file descriptor
number of events


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 verbose descriptions explaining the output.

fddist will sample until Ctrl-C is hit.


June 8, 2005 version 0.70