NAME

pridist.d - process priority distribution. Uses DTrace.

SYNOPSIS

pridist.d

DESCRIPTION

This is a simple DTrace script that samples at 1000 Hz which process is on the CPUs, and what the priority is. A distribution plot is printed.

With priorities, the higher the priority the better chance the process (actually, thread) has of being scheduled.

This idea came from the script /usr/demo/dtrace/profpri.d, which produces similar output for one particular PID.

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

EXAMPLES

This samples until Ctrl-C is hit.: # pridist.d

FIELDS

CMD: process name
PID: process ID
value: process priority
count: number of samples of at least this priority

BASED ON

/usr/demo/dtrace/profpri.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

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