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UNIX for Dummies Questions & Answers
Write/read to file descriptors
Post 302275299 by machshev on Friday 9th of January 2009 05:08:34 PM
01-09-2009
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LEARN ABOUT MOJAVE
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)