轮询调度的实时系统的CPU占用率代码实现
时间: 2023-10-29 18:07:12 浏览: 33
对于实时系统的轮询调度,可以使用以下代码实现CPU占用率的计算:
```c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define NUM_TASKS 3
#define QUANTUM 1
struct task {
int id;
int priority;
int burst_time;
int remaining_time;
};
int get_random_int(int min, int max) {
return min + rand() % (max - min + 1);
}
int main() {
srand(time(NULL));
struct task tasks[NUM_TASKS];
int total_burst_time = 0;
int remaining_burst_time = 0;
int current_time = 0;
int cpu_utilization = 0;
int i, j;
// Initialize tasks
for (i = 0; i < NUM_TASKS; i++) {
tasks[i].id = i + 1;
tasks[i].priority = get_random_int(1, 10);
tasks[i].burst_time = get_random_int(1, 10);
tasks[i].remaining_time = tasks[i].burst_time;
total_burst_time += tasks[i].burst_time;
}
// Run tasks
while (remaining_burst_time > 0) {
for (i = 0; i < NUM_TASKS; i++) {
if (tasks[i].remaining_time > 0) {
printf("Time %d: Running task %d\n", current_time, tasks[i].id);
tasks[i].remaining_time -= QUANTUM;
remaining_burst_time -= QUANTUM;
cpu_utilization += QUANTUM;
if (tasks[i].remaining_time <= 0) {
printf("Time %d: Task %d completed\n", current_time, tasks[i].id);
}
}
}
current_time += QUANTUM;
}
// Print CPU utilization
printf("Total burst time: %d\n", total_burst_time);
printf("CPU utilization: %f\n", (float)cpu_utilization / total_burst_time * 100);
return 0;
}
```
该代码模拟了三个随机生成的任务的轮询调度过程,并计算了CPU的占用率。在每个时间片中,程序会遍历所有任务,并将当前时间片的时间加到CPU利用率中。任务完成后,程序会输出相应的信息。最后,程序会输出总的任务执行时间和CPU占用率。