1#!/usr/sbin/dtrace -s 2/* 3 * cswstat.d - context switch time stat. 4 * Uses DTrace (Solaris 10 03/05) 5 * 6 * This prints a context switch count and consumed time for context 7 * switching every second. 8 * 9 * 03-Nov-2005, ver 0.71 10 * 11 * USAGE: cswstat.d 12 * 13 * FIELDS: 14 * TIME Current time 15 * NUM Number of context switches 16 * CSWTIME Time consumed context switching, us 17 * AVGTIME Average context switch time, us 18 * 19 * THANKS: Toomas Soome 20 * 21 * COPYRIGHT: Copyright (c) 2005 Brendan Gregg. 22 * 23 * CDDL HEADER START 24 * 25 * The contents of this file are subject to the terms of the 26 * Common Development and Distribution License, Version 1.0 only 27 * (the "License"). You may not use this file except in compliance 28 * with the License. 29 * 30 * You can obtain a copy of the license at Docs/cddl1.txt 31 * or http://www.opensolaris.org/os/licensing. 32 * See the License for the specific language governing permissions 33 * and limitations under the License. 34 * 35 * CDDL HEADER END 36 * 37 * 17-May-2005 Brendan Gregg Created this. 38 */ 39 40#pragma D option quiet 41 42dtrace:::BEGIN 43{ 44 /* print header */ 45 printf("%-20s %8s %12s %12s\n", "TIME", "NUM", "CSWTIME", "AVGTIME"); 46 times = 0; 47 num = 0; 48} 49 50sched:::off-cpu 51{ 52 /* csw start */ 53 start[cpu] = timestamp; 54 num++; 55} 56 57sched:::on-cpu 58/start[cpu]/ 59{ 60 /* csw end */ 61 times += timestamp - start[cpu]; 62 start[cpu] = 0; 63} 64 65profile:::tick-1sec 66{ 67 /* print output */ 68 printf("%20Y %8d %12d %12d\n", walltimestamp, num, times/1000, 69 times/(1000*num)); /* assume num > 0 */ 70 times = 0; 71 num = 0; 72} 73