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fix calculation of current cpu counters (needs 1 second sleep)

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This commit is contained in:
Babak Farrokhi 2018-05-19 21:59:33 +04:30
parent 95d4549d0f
commit ba200ff556
1 changed files with 23 additions and 6 deletions
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29
cpustat/cpustat.c
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@ -29,11 +29,13 @@
#include <kvm.h>
#include <math.h>
#include <stdio.h>
#include <stdbool.h>
#include <strings.h>
#include <unistd.h>
#include <sys/sysctl.h>
#include <sys/types.h>
static struct statinfo cur;
static struct statinfo cur, last;
kvm_t *kd = NULL;
static int readvar(kvm_t *kd, const char *name, int nlid, void *ptr,
@ -52,21 +54,36 @@ static int readvar(kvm_t *kd, const char *name, int nlid, void *ptr,
return (0);
}
static void cpustats(void) {
static void cpustats(bool print) {
int state;
long tmp;
double cptime = 0.0;
char *names[] = {"user", "nice", "system", "interrupt", "idle"};
readvar(kd, "kern.cp_time", 0, &cur.cp_time, sizeof(cur.cp_time));
for (state = 0; state < CPUSTATES; state++) {
tmp = cur.cp_time[state];
cur.cp_time[state] -= last.cp_time[state];
last.cp_time[state] = tmp;
}
for (state = 0; state < CPUSTATES; ++state)
cptime += cur.cp_time[state];
for (state = 0; state < CPUSTATES; ++state)
printf("%s.value %.0f\n", names[state],
rint(100. * cur.cp_time[state] / (cptime ? cptime : 1)));
if (print) {
for (state = 0; state < CPUSTATES; ++state)
printf("%s.value %.0f\n", names[state],
rint(100. * cur.cp_time[state] / (cptime ? cptime : 1)));
}
}
int main(void)
{
cpustats();
bzero(cur.cp_time, sizeof(cur.cp_time));
bzero(last.cp_time, sizeof(last.cp_time));
cpustats(false);
sleep(1);
cpustats(true);
}