1#!/bin/sh 2 3# 4# Copyright (c) 2014 EMC Corp. 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 30 31# Show scheduler fairness for ULE vs. 4BSD. 32 33. ../default.cfg 34 35here=`pwd` 36cd /tmp 37sed '1,/^EOF/d' < $here/$0 > sched.c 38mycc -o sched -Wall -Wextra -O0 sched.c || exit 1 39rm -f sched.c 40cd $here 41 42mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint 43mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart 44 45mdconfig -a -t swap -s 1g -u $mdstart || exit 1 46newfs $newfs_flags md$mdstart > /dev/null 47mount /dev/md$mdstart $mntpoint 48chmod 777 $mntpoint 49 50cpus=`sysctl hw.ncpu | sed 's/.*: //'` 51uname -v 52(cd $mntpoint; /tmp/sched $((cpus + 1))) > /dev/null 2>&1 & 53sleep 30 54export LANG=C 55top -U nobody -d 1 | grep nobody | awk '{print $11}' | sed 's/%//' | 56 ministat -A -w 73 | tail -1 | awk '{if ($NF > 1.0) exit 1}' || 57{ echo Broken; top -U nobody -d 1 | grep nobody; } 58killall sched 59wait 60 61for i in `jot 3`; do 62 echo "run #$i" 63 (cd $mntpoint; /tmp/sched $((cpus + 1))) 64done 65 66while mount | grep $mntpoint | grep -q /dev/md; do 67 umount $mntpoint || sleep 1 68done 69rm -f /tmp/sched 70mdconfig -d -u $mdstart 71exit 72EOF 73#include <sys/param.h> 74#include <sys/stat.h> 75#include <sys/time.h> 76#include <sys/wait.h> 77 78#include <err.h> 79#include <errno.h> 80#include <fcntl.h> 81#include <fts.h> 82#include <libutil.h> 83#include <pwd.h> 84#include <sched.h> 85#include <stdint.h> 86#include <stdio.h> 87#include <stdlib.h> 88#include <string.h> 89#include <unistd.h> 90 91#define N 100 * 1024 * 1024 92 93double r; 94int parallel; 95 96void 97work(void) 98{ 99 struct passwd *pw; 100 struct timespec start, finish; 101 double d1, d2; 102 int i, j; 103 volatile char *cp; 104 105 while (access("rendezvous", R_OK) != 0) 106 usleep(1); 107 108 if ((pw = getpwnam("nobody")) == NULL) 109 err(1, "no such user: nobody"); 110 if (setgroups(1, &pw->pw_gid) || 111 setegid(pw->pw_gid) || setgid(pw->pw_gid) || 112 seteuid(pw->pw_uid) || setuid(pw->pw_uid)) 113 err(1, "Can't drop privileges to \"nobody\""); 114 endpwent(); 115 116 d1 = d2 = 0; 117 cp = malloc(N); 118 clock_gettime(CLOCK_REALTIME_PRECISE, &start); 119 for (i = 0; i < 1; i++) { 120 for (j = 0; j < INT_MAX; j++) { 121 d1 = d1 + 1.0 / j; 122 d2 = d1 + 0.8 / j; 123 if (j % 1000 == 0) { 124 cp[arc4random() % N] = j % 255; 125 } 126 } 127 } 128 r = d1 + d2; 129 clock_gettime(CLOCK_REALTIME_PRECISE, &finish); 130 timespecsub(&finish, &start, &finish); 131#if defined(DEBUG) 132 fprintf(stderr, "Elapsed time for pid %d: %.4f\n", getpid(), 133 finish.tv_sec + (double)finish.tv_nsec / 1e9); 134#endif 135 136 _exit(0); 137} 138 139int 140main(int argc, char **argv) 141{ 142 int fd, i; 143 144 if (argc == 2) 145 parallel = atoi(argv[1]); 146 else 147 errx(1, "Usage: %s <cpus>", argv[0]); 148 149 for (i = 0; i < parallel; i++) { 150 if (fork() == 0) 151 work(); 152 } 153 if ((fd = open("rendezvous", O_CREAT, 0644)) == -1) 154 err(1, "open()"); 155 close(fd); 156 for (i = 0; i < parallel; i++) 157 wait(NULL); 158 159 return (0); 160} 161