作业调度 高响应比优先
时间: 2024-02-10 21:08:14 浏览: 29
高响应比优先算法是一种作业调度算法,它综合考虑了作业的等待时间和作业运行时间,以改善处理机的调度性能。该算法优先选择响应比最高的作业进行调度,以确保短作业得到及时处理,同时避免长作业等待时间过长。
以下是一个用C语言实现的高响应比优先调度算法的示例:
```c
#include <stdio.h>
struct Job {
int id;
int arrivalTime;
int burstTime;
};
void calculateResponseRatio(struct Job jobs[], int n, float responseRatio[]) {
int i;
for (i = 0; i < n; i++) {
responseRatio[i] = (float)(jobs[i].burstTime + jobs[i].arrivalTime) / jobs[i].burstTime;
}
}
void sortJobs(struct Job jobs[], int n) {
int i, j;
struct Job temp;
for (i = 0; i < n - 1; i++) {
for (j = 0; j < n - i - 1; j++) {
if (jobs[j].arrivalTime > jobs[j + 1].arrivalTime) {
temp = jobs[j];
jobs[j] = jobs[j + 1];
jobs[j + 1] = temp;
}
}
}
}
void scheduleJobs(struct Job jobs[], int n) {
int i, j;
float responseRatio[n];
calculateResponseRatio(jobs, n, responseRatio);
sortJobs(jobs, n);
int waitingTime[n];
int turnaroundTime[n];
int totalWaitingTime = 0;
int totalTurnaroundTime = 0;
waitingTime[0] = 0;
for (i = 1; i < n; i++) {
waitingTime[i] = jobs[i - 1].burstTime + waitingTime[i - 1];
totalWaitingTime += waitingTime[i];
}
for (i = 0; i < n; i++) {
turnaroundTime[i] = jobs[i].burstTime + waitingTime[i];
totalTurnaroundTime += turnaroundTime[i];
}
printf("Job\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n");
for (i = 0; i < n; i++) {
printf("%d\t%d\t\t%d\t\t%d\t\t%d\n", jobs[i].id, jobs[i].arrivalTime, jobs[i].burstTime, waitingTime[i], turnaroundTime[i]);
}
float averageWaitingTime = (float)totalWaitingTime / n;
float averageTurnaroundTime = (float)totalTurnaroundTime / n;
printf("Average Waiting Time: %.2f\n", averageWaitingTime);
printf("Average Turnaround Time: %.2f\n", averageTurnaroundTime);
}
int main() {
int n, i;
printf("Enter the number of jobs: ");
scanf("%d", &n);
struct Job jobs[n];
for (i = 0; i < n; i++) {
printf("Enter arrival time and burst time for job %d: ", i + 1);
scanf("%d %d", &jobs[i].arrivalTime, &jobs[i].burstTime);
jobs[i].id = i + 1;
}
scheduleJobs(jobs, n);
return 0;
}
```