test/pcpu/cpustat.c

   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 }