1#!/bin/sh 2# 3# Copyright (c) 2012 George V. Neville-Neil 4# All rights reserved. 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions 8# are met: 9# 1. Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# 2. Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in the 13# documentation and/or other materials provided with the distribution. 14# 15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25# SUCH DAMAGE. 26# 27# $FreeBSD$ 28# 29# The hotopen D script periodically outputs table of which UIDs 30# are opening files. This is a very quick way to find out if 31# a paritcular user is thrashing a system with rapid calls to 32# open/close. 33# 34# Usage: hotopen 35# 36 37/usr/sbin/dtrace -n ' 38#pragma D option quiet 39BEGIN 40{ 41 printf("Files opened per UID in the last second.\n"); 42} 43 44syscall::open:entry 45{ 46 @files[uid] = count(); 47 output = 1; 48} 49 50tick-1sec 51/output != 0/ 52{ 53 printf("%-20Y \n", walltimestamp); 54 printa("uid %d\tcount %@d\n", @files, @files); 55 trunc(@files); 56 output = 0; 57} 58' 59