1 /* 2 * Copyright (c) 2004, 2005 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Hiten Pandya <hmp@dragonflybsd.org> and Matthew Dillon 6 * <dillon@backplane.com> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $DragonFly: src/test/pcpu/cpustat.c,v 1.1 2005/08/08 03:31:00 hmp Exp $ 36 */ 37 38 /* 39 * CPUSTAT - Utility for displaying per-cpu cpu load statistics. 40 * 41 * NB: this program should be either made part of top(1) or part 42 * of a new accounting program that has the ability to display 43 * per-cpu break-up for statistics that support them. 44 */ 45 #include <sys/param.h> 46 #include <sys/sysctl.h> 47 48 #include <stdlib.h> 49 #include <stdio.h> 50 #include <errno.h> 51 #include <err.h> 52 #include <kinfo.h> 53 #include <unistd.h> 54 55 static int numcpus = 0; 56 57 #define INTERVAL 1 58 59 static int 60 cputime_get(struct kinfo_cputime **percpu) 61 { 62 int error = 0; 63 size_t len = sizeof(struct kinfo_cputime) * numcpus; 64 65 if ((*percpu = malloc(len)) == NULL) { 66 error = ENOMEM; 67 } 68 69 /* retrieve per-cpu statistics from kernel */ 70 if (error == 0) { 71 bzero(*percpu, len); 72 error = sysctlbyname("kern.cputime", *percpu, &len, NULL, 0); 73 if (error < 0) { 74 warn("sysctl: kern.cputime"); 75 error = EINVAL; 76 } 77 } 78 79 /* cross-check size */ 80 if (error == 0 && (len / sizeof(struct kinfo_cputime)) != numcpus) { 81 error = EINVAL; 82 } 83 84 if (error) { 85 free(*percpu); 86 *percpu = NULL; 87 } 88 return (error); 89 } 90 91 static void 92 cputime_get_diff(struct kinfo_cputime *old, struct kinfo_cputime *new, 93 struct kinfo_cputime *delta) 94 { 95 delta->cp_user = new->cp_user - old->cp_user; 96 delta->cp_nice = new->cp_nice - old->cp_nice; 97 delta->cp_sys = new->cp_sys - old->cp_sys; 98 delta->cp_intr = new->cp_intr - old->cp_intr; 99 delta->cp_idle = new->cp_idle - old->cp_idle; 100 } 101 102 static __inline uint64_t 103 cputime_get_total(struct kinfo_cputime *cpt) 104 { 105 return( 106 cpt->cp_user + cpt->cp_nice + cpt->cp_sys + cpt->cp_intr + cpt->cp_idle); 107 } 108 109 int 110 main(void) 111 { 112 int i, error = 0; 113 114 /* get number of cpus */ 115 if ( kinfo_get_cpus(&numcpus) ) 116 exit(-1); 117 118 printf("%d cpus\n", numcpus); 119 120 for (;;) { 121 struct kinfo_cputime *old, *new, delta; 122 123 error = cputime_get(&old); 124 if (error) 125 return -1; 126 127 sleep(INTERVAL); 128 129 error = cputime_get(&new); 130 if (error) 131 return -1; 132 133 for (i = 0; i < numcpus; ++i) { 134 uint64_t total = 0; 135 #define pct(t) (total == 0 ? 0.0 : ((double)t * 100.0 / (double)total)) 136 cputime_get_diff(&old[i], &new[i], &delta); 137 total = cputime_get_total(&delta); 138 printf("CPU-%d state: ", i); 139 printf("%6.2f%% user, %6.2f%% nice, %6.2f%% sys, " 140 "%6.2f%% intr, %6.2f%% idle\n", 141 pct(delta.cp_user), pct(delta.cp_nice), 142 pct(delta.cp_sys), 143 pct(delta.cp_intr), pct(delta.cp_idle)); 144 } 145 free(old); 146 free(new); 147 } 148 } 149