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 verbose
descriptions explaining the output.
EXIT
fddist will sample until Ctrl-C is hit.
SEE ALSO
dtrace(1M)
version 0.70 June 8, 2005 fddist(1m)