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05_2_SJF_Algorithm.c
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05_2_SJF_Algorithm.c
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/*
// #include<stdio.h>
// #include<stdbool.h>
// #include<limits.h>
// struct Process {
// int id;
// int at, wt, tat, rt, st, ct, bt;
// bool isCompleted;
// } p[100];
// int n = 0, cpuTime = 0, first = -1 , last = -1, completed = 0 ;
// float avgwt = 0, avgrt = 0, avgtat = 0, throughput = 0, cupUtilization = 0;
// void input( ) {
// printf("Enter no. of Process : ");
// scanf("%d",&n);
// printf("Enter Process Arrival Time : \n");
// for( int i =0 ; i < n ; i++ ){
// scanf("%d",&p[i].at);
// p[i].id = i;
// }
// printf("Enter Process Burst Time : \n");
// for( int i =0 ; i < n ; i++ ){
// scanf("%d",&p[i].bt);
// p[i].isCompleted = false;
// }
// }
// int getProcess( ) {
// int min = INT_MAX, minIndex = -1;
// for(int i = 0; i < n; i++) {
// if(p[i].at <= cpuTime && p[i].isCompleted == false) {
// if( p[i].bt < min ) {
// min = p[i].bt;
// minIndex = i;
// }
// if( p[i].bt == p[minIndex].bt) {
// if(p[i].at < p[minIndex].at) {
// min = p[i].bt;
// minIndex = i;
// }
// }
// }
// }
// return minIndex;
// }
// void SJF( ) {
// while( completed != n ) {
// int i = getProcess();
// if(i == -1) {
// cpuTime++;
// } else {
// if(completed == 0){
// first = i;
// } else if( completed == n-1){
// last = i;
// }
// p[i].st = cpuTime;
// p[i].ct = p[i].st + p[i].bt;
// cpuTime = p[i].ct;
// p[i].isCompleted = true;
// completed++;
// }
// }
// }
// void calculate( ) {
// int sumbt = 0, sumwt = 0, sumtat = 0, sumrt = 0 ;
// for( int i = 0 ; i < n ; i++ ) {
// p[i].tat = p[i].ct - p[i].at;
// p[i].wt = p[i].tat - p[i].bt;
// p[i].rt = p[i].st - p[i].at;
// }
// for( int i = 0 ; i < n ; i++ ) {
// sumbt = sumbt + p[i].bt;
// sumtat += p[i].tat;
// sumrt += p[i].rt;
// sumwt += p[i].wt;
// }
// avgrt = (float)sumrt/n;
// avgtat = (float)sumtat/n;
// avgwt = (float)sumwt/n;
// throughput = (float)n/p[last].ct;
// cupUtilization = (float)sumbt/p[last].ct * 100;
// }
// void print( ) {
// printf("Process Details : \n");
// printf(" ID\t AT\t BT\t ST\t CT\t TAT\t WT\t RT\n");
// for( int i =0 ; i < n ; i++) {
// printf(" %d\t %d\t %d\t %d\t %d\t %d\t %d\t %d\n",p[i].id, p[i].at, p[i].bt, p[i].st, p[i].ct, p[i].tat, p[i].wt, p[i].rt);
// }
// printf("\nAverage TAT : %f\nAverage WT : %f\nAverage RT : %f\nThroughput : %f\nCPU Utilization : %f\n", avgtat, avgwt, avgrt,throughput,cupUtilization);
// printf("\nFirst : %d\nLast : %d\n",first,last);
// }
// int main( ) {
// input();
// SJF();
// calculate();
// print();
// }
// #include<stdio.h>
// #include<stdbool.h>
// #include<limits.h>
// #include<stdlib.h>
// struct process {
// int id, at, bt, st, ct, tat, wt, rt;
// bool iscompleted;
// };
// struct process p[100];
// int n = 0, cputime = 0, first = 0, last = 0, completed = 0;
// float avgtat = 0, avgwt = 0, avgrt = 0, throughput = 0, cpuUtilization = 0;
// void input( ) {
// printf("Enter no. of Process : ");
// scanf("%d",&n);
// printf("Enter Process Arrival Time : \n");
// for( int i =0 ; i < n ; i++ ){
// scanf("%d",&p[i].at);
// p[i].id = i;
// }
// printf("Enter Process Burst Time : \n");
// for( int i =0 ; i < n ; i++ ){
// scanf("%d",&p[i].bt);
// p[i].iscompleted = false;
// }
// }
// int getProcess( ) {
// int max = INT_MIN, returnIndex = -1;
// for( int i = 0; i<n; i++){
// if( p[i].at <= cputime && p[i].iscompleted == false) {
// if( p[i].bt > max ) {
// max = p[i].bt;
// returnIndex = i;
// }
// if( p[i].bt == p[returnIndex].bt ) {
// if( p[i].at <= p[returnIndex].at ) {
// max = p[i].bt;
// returnIndex = i;
// }
// }
// }
// }
// return returnIndex;
// }
// void LJF( ) {
// while( completed != n ) {
// int i = getProcess();
// if( i == -1 ) {
// cputime++;
// } else {
// if( completed == 0 ) {
// first = i;
// } else if( completed == n-1) {
// last = i;
// }
// p[i].st = cputime;
// cputime = cputime + p[i].bt;
// p[i].ct = cputime;
// p[i].iscompleted = true;
// completed++;
// }
// }
// }
// void calculateSeprateTimes( ) {
// for( int i =0 ; i< n; i++) {
// p[i].tat = p[i].ct - p[i].at;
// p[i].wt = p[i].tat - p[i].bt;
// p[i].rt = p[i].st - p[i].at;
// }
// }
// void calculateAvgTimes( ) {
// int sumTAT = 0, sumWT = 0, sumRT = 0, sumBT = 0;
// for( int i = 0; i < n ; i++) {
// sumTAT = sumTAT + p[i].tat;
// sumRT = sumRT + p[i].rt;
// sumWT = sumWT + p[i].wt;
// sumBT = sumBT + p[i].bt;
// }
// avgrt = (float)sumRT/n;
// avgtat = (float)sumTAT/n;
// avgwt = (float)sumWT/n;
// throughput = (float)n/p[last].ct;
// cpuUtilization = (float) (sumBT/p[last].ct)*100;
// }
// void print( ) {
// printf("Process Details : \n");
// printf(" ID\t AT\t BT\t ST\t CT\t TAT\t WT\t RT\n");
// for( int i =0 ; i < n ; i++) {
// printf(" %d\t %d\t %d\t %d\t %d\t %d\t %d\t %d\n",p[i].id, p[i].at, p[i].bt, p[i].st, p[i].ct, p[i].tat, p[i].wt, p[i].rt);
// }
// printf("\nAverage TAT : %f\nAverage WT : %f\nAverage RT : %f\nThroughput : %f\nCPU Utilization : %f\n", avgtat, avgwt, avgrt,throughput,cpuUtilization);
// printf("\nFirst : %d\nLast : %d\n",first,last);
// }
// int main( ) {
// input();
// LJF();
// calculateSeprateTimes();
// calculateAvgTimes();
// print();
// }
*/
#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
#include<limits.h>
// Structure
typedef struct process {
int processId;
int arrivalTime;
int burstTime;
int startTime;
int completedTime;
int turnaroundTime;
int waitingTime;
int responseTime;
bool isCompleted;
};
// Variables
int n = 0, cpuTime = 0, completed = 0;
struct process p[100];
float sumWaitingTime = 0.0, sumTurnaroundTime = 0.0, sumResponseTime = 0.0, sumBurstTime = 0.0;
float averageWaitingTime = 0.0, averageTurnaroundTime = 0.0, averageResponseTime = 0.0;
float cpuUtilization = 0.0;
float throughput = 0.0;
// Function Declaration & Body
void input(){
printf("\nEnter Number of Process : ");
scanf("%d", &n);
printf("\nEnter Process Arrival Time & Burst Time (Space Seprated) -->");
for( int i = 0; i < n; i++) {
if( i == 0 ) printf("\n\t1'st Process : ");
else if( i == 1 ) printf("\t2'nd Process : ");
else if( i == 2 ) printf("\t3'rd Process : ");
else printf("\t%d'th Process : ", i+1);
scanf("%d%d", &p[i].arrivalTime, &p[i].burstTime);
p[i].processId = i;
p[i].isCompleted = false;
}
}
int getprocess() {
int id = -1;
int min = INT_MAX;
for( int i = 0 ; i<n ; i++) {
if( p[i].arrivalTime <= cpuTime && p[i].isCompleted == false ) {
if( p[i].burstTime < min ) {
min = p[i].burstTime;
id = p[i].processId;
}
if( p[i].burstTime == min && p[i].arrivalTime < p[id].arrivalTime ) {
min = p[i].burstTime;
id = p[i].processId;
} else if( p[i].burstTime == min && p[i].arrivalTime == p[id].arrivalTime ) {
if( p[i].processId < id ) {
min = p[i].burstTime;
id = p[i].processId;
}
}
}
}
return id;
}
void sjfAlgo() {
while( completed < n ) {
int id = getprocess();
if( id == -1 ) {
cpuTime++;
} else {
p[id].startTime = cpuTime;
cpuTime += p[id].burstTime;
p[id].completedTime = cpuTime;
p[id].turnaroundTime = p[id].completedTime - p[id].arrivalTime;
p[id].waitingTime = p[id].turnaroundTime - p[id].burstTime;
p[id].responseTime = p[id].startTime - p[id].arrivalTime;
p[id].isCompleted = true;
completed++;
}
}
}
void calclate( ) {
for( int i = 0 ; i<n ; i++ ) {
sumResponseTime += (float)p[i].responseTime;
sumTurnaroundTime += (float)p[i].turnaroundTime;
sumWaitingTime += (float)p[i].waitingTime;
sumBurstTime += (float)p[i].burstTime;
}
averageResponseTime = sumResponseTime/(float)n;
averageTurnaroundTime = sumTurnaroundTime/(float)n;
averageWaitingTime = sumWaitingTime/(float)n;
throughput = (float)n/(float)cpuTime;
cpuUtilization = (sumBurstTime * 100)/(float)cpuTime;
}
void output(){
printf("\nNumber of Process : %d\n", n);
printf("Process Table -->");
printf("\n ID AT BT ST CT TAT WT RT COMPLETE");
for( int i = 0; i < n; i++) {
printf("\n %7d %7d %7d %7d %7d %7d %7d %7d %11s", p[i].processId, p[i].arrivalTime, p[i].burstTime, p[i].startTime, p[i].completedTime, p[i].turnaroundTime, p[i].waitingTime, p[i].responseTime, p[i].isCompleted ? "TRUE" : "FAlSE" );
}
printf("\nAverage Turnaround Time : %f", averageTurnaroundTime);
printf("\nAverage Waiting Time : %f", averageWaitingTime);
printf("\nAverage Response Time : %f", averageResponseTime);
printf("\nThroughPut : %f", throughput);
printf("\nCPU Utilization : %f\n", cpuUtilization);
}
// Function Call
int main() {
input();
sjfAlgo();
calclate();
output();
}