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priclass.d(1)                   USER COMMANDS                  priclass.d(1)




NAME

       priclass.d - priority distribution by scheduling class. Uses DTrace.


SYNOPSIS

       priclass.d


DESCRIPTION

       This  is  a  simple  DTrace  script that samples at 1000 Hz the current
       thread's scheduling class and priority. A distribution plot is printed.

       With  priorities,  the higher the priority the better chance the thread
       has of being scheduled.

       This idea came from the script /usr/demo/dtrace/pri.d,  which  produces
       similar output for priority changes, not samples.

       Since  this  uses  DTrace, only users with root privileges can run this
       command.


EXAMPLES

       This samples until Ctrl-C is hit.
              # priclass.d



FIELDS

       value  process priority

       count  number of samples of at least this priority



SCHEDULING CLASSES

       TS     time sharing

       IA     interactive

       RT     real time

       SYS    system

       FSS    fair share scheduler



BASED ON

       /usr/demo/dtrace/pri.d



DOCUMENTATION

       DTrace Guide "profile Provider" 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

       priclass.d will sample until Ctrl-C is hit.


SEE ALSO

       pridist.d(1M), dispadmin(1M), dtrace(1M)




version 1.00                     Apr 22, 2006                   priclass.d(1)

Mac OS X 10.6 - Generated Thu Sep 17 20:08:56 CDT 2009
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