RedHat Linux获取cpu占用率.docx
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2022-10-25
21:56:27
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
struct occupy
{
char name[20];
unsigned int user;
unsigned int nice;
unsigned int system;
unsigned int idle;
};
float g_cpu_used;
int cpu_num;
void cal_occupy(struct occupy *, struct occupy *);
void get_occupy(struct occupy *);
int main()
{
struct occupy ocpu[10];
struct occupy ncpu[10];
int i;
cpu_num = sysconf(_SC_NPROCESSORS_ONLN);
for(;;)
{
sleep(1);
get_occupy(ocpu);
sleep(1);
get_occupy(ncpu);
for (i=0; i<cpu_num; i++)
{
cal_occupy(&ocpu[i], &ncpu[i]);
printf("%f ", g_cpu_used);
}
}
}
void
cal_occupy (struct occupy *o, struct occupy *n)
{
double od, nd;
double id, sd;
double scale;
od = (double) (o->user + o->nice + o->system +
o->idle);
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