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#!/usr/sbin/dtrace -s
/*
* cswstat.d - context switch time stat.
* Uses DTrace (Solaris 10 03/05)
*
* This prints a context switch count and consumed time for context
* switching every second.
*
* $Id: cswstat.d 15 2007-09-11 09:09:25Z brendan $
*
* USAGE: cswstat.d
*
* FIELDS:
* TIME Current time
* NUM Number of context switches
* CSWTIME(us) Time consumed context switching, us
* AVGTIME(us) Average context switch time, us
*
* THANKS: Toomas Soome
*
* COPYRIGHT: Copyright (c) 2005 Brendan Gregg.
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at Docs/cddl1.txt
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* CDDL HEADER END
*
* 17-May-2005 Brendan Gregg Created this.
* 03-Nov-2005 " " Last update.
*/
#pragma D option quiet
dtrace:::BEGIN
{
/* print header */
printf("%-20s %8s %12s %12s\n", "TIME", "NUM", "CSWTIME(us)",
"AVGTIME(us)");
times = 0;
num = 0;
}
sched:::off-cpu
{
/* csw start */
num++;
start[cpu] = timestamp;
}
sched:::on-cpu
/start[cpu]/
{
/* csw end */
times += timestamp - start[cpu];
start[cpu] = 0;
}
profile:::tick-1sec
{
/* print output */
printf("%20Y %8d %12d %12d\n", walltimestamp, num, times/1000,
num == 0 ? 0 : times/(1000 * num));
times = 0;
num = 0;
}
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