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 directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output.

EXIT

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