1235368Sgnn#!/usr/sbin/dtrace -s 2235368Sgnn/* 3235368Sgnn * cswstat.d - context switch time stat. 4235368Sgnn * Uses DTrace (Solaris 10 03/05) 5235368Sgnn * 6235368Sgnn * This prints a context switch count and consumed time for context 7235368Sgnn * switching every second. 8235368Sgnn * 9235368Sgnn * $Id: cswstat.d 15 2007-09-11 09:09:25Z brendan $ 10235368Sgnn * 11235368Sgnn * USAGE: cswstat.d 12235368Sgnn * 13235368Sgnn * FIELDS: 14235368Sgnn * TIME Current time 15235368Sgnn * NUM Number of context switches 16235368Sgnn * CSWTIME(us) Time consumed context switching, us 17235368Sgnn * AVGTIME(us) Average context switch time, us 18235368Sgnn * 19235368Sgnn * THANKS: Toomas Soome 20235368Sgnn * 21235368Sgnn * COPYRIGHT: Copyright (c) 2005 Brendan Gregg. 22235368Sgnn * 23235368Sgnn * CDDL HEADER START 24235368Sgnn * 25235368Sgnn * The contents of this file are subject to the terms of the 26235368Sgnn * Common Development and Distribution License, Version 1.0 only 27235368Sgnn * (the "License"). You may not use this file except in compliance 28235368Sgnn * with the License. 29235368Sgnn * 30235368Sgnn * You can obtain a copy of the license at Docs/cddl1.txt 31235368Sgnn * or http://www.opensolaris.org/os/licensing. 32235368Sgnn * See the License for the specific language governing permissions 33235368Sgnn * and limitations under the License. 34235368Sgnn * 35235368Sgnn * CDDL HEADER END 36235368Sgnn * 37235368Sgnn * 17-May-2005 Brendan Gregg Created this. 38235368Sgnn * 03-Nov-2005 " " Last update. 39235368Sgnn */ 40235368Sgnn 41235368Sgnn#pragma D option quiet 42235368Sgnn 43235368Sgnndtrace:::BEGIN 44235368Sgnn{ 45235368Sgnn /* print header */ 46235368Sgnn printf("%-20s %8s %12s %12s\n", "TIME", "NUM", "CSWTIME(us)", 47235368Sgnn "AVGTIME(us)"); 48235368Sgnn times = 0; 49235368Sgnn num = 0; 50235368Sgnn} 51235368Sgnn 52235368Sgnnsched:::off-cpu 53235368Sgnn{ 54235368Sgnn /* csw start */ 55235368Sgnn num++; 56235368Sgnn start[cpu] = timestamp; 57235368Sgnn} 58235368Sgnn 59235368Sgnnsched:::on-cpu 60235368Sgnn/start[cpu]/ 61235368Sgnn{ 62235368Sgnn /* csw end */ 63235368Sgnn times += timestamp - start[cpu]; 64235368Sgnn start[cpu] = 0; 65235368Sgnn} 66235368Sgnn 67235368Sgnnprofile:::tick-1sec 68235368Sgnn{ 69235368Sgnn /* print output */ 70235368Sgnn printf("%20Y %8d %12d %12d\n", walltimestamp, num, times/1000, 71235368Sgnn num == 0 ? 0 : times/(1000 * num)); 72235368Sgnn times = 0; 73235368Sgnn num = 0; 74235368Sgnn} 75