fifo added
This commit is contained in:
jazzy1902
parent
a6772502e8
commit
97d0d231e1
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@ -0,0 +1,124 @@
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#include <iostream>
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#include <fstream>
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#include <sstream>
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#include <vector>
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#include <queue>
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#include <iomanip>
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using namespace std;
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struct Process {
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int pid;
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int arrival_time;
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vector<int> burst_times;
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int current_burst_index;
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int completion_time;
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int waiting_time;
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int turnaround_time;
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bool in_cpu;
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};
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vector<Process> processes;
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void fifo() {
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queue<Process*> ready_queue;
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int current_time = 0;
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int completed_processes = 0;
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int process_count = processes.size();
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while (completed_processes < process_count) {
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// Add processes to the ready queue based on arrival time
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for (auto& process : processes) {
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if (process.arrival_time <= current_time && !process.in_cpu) {
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ready_queue.push(&process);
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process.in_cpu = true;
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}
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}
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if (!ready_queue.empty()) {
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Process* current_process = ready_queue.front();
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ready_queue.pop();
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// Simulate CPU execution
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for (int i = current_process->current_burst_index; i < current_process->burst_times.size(); i += 2) {
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int cpu_burst = current_process->burst_times[i];
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current_time += cpu_burst; // Advance time by CPU burst duration
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current_process->current_burst_index++;
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// Handle I/O burst if there's one
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if (i + 1 < current_process->burst_times.size()) {
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int io_burst = current_process->burst_times[i + 1];
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current_time += io_burst; // Advance time by I/O burst duration
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}
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}
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current_process->completion_time = current_time;
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current_process->turnaround_time = current_process->completion_time - current_process->arrival_time;
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current_process->waiting_time = current_process->turnaround_time - (current_process->burst_times.size() / 2);
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completed_processes++;
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} else {
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// No process is ready; advance time
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current_time++;
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}
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}
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// Calculate averages
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int total_waiting_time = 0, total_turnaround_time = 0;
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for (const auto& process : processes) {
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total_waiting_time += process.waiting_time;
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total_turnaround_time += process.turnaround_time;
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}
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double avg_waiting_time = static_cast<double>(total_waiting_time) / process_count;
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double avg_turnaround_time = static_cast<double>(total_turnaround_time) / process_count;
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// Output results
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cout << "FIFO Scheduling Results:\n";
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cout << "Processes:\n";
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for (const auto& process : processes) {
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cout << "Process ID: " << process.pid
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<< ", Completion Time: " << process.completion_time
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<< ", Waiting Time: " << process.waiting_time
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<< ", Turnaround Time: " << process.turnaround_time << endl;
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}
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cout << "Average Waiting Time: " << fixed << setprecision(2) << avg_waiting_time << endl;
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cout << "Average Turnaround Time: " << fixed << setprecision(2) << avg_turnaround_time << endl;
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}
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int main(int argc, char** argv) {
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if (argc != 3) {
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cout << "Usage: ./scheduler.out <path-to-workload-file> <scheduler_algorithm>\n";
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return -1;
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}
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ifstream file(argv[1]);
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string line;
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int pid = 0;
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while (getline(file, line)) {
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if (line.empty()) continue;
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Process process;
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process.pid = pid++;
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process.current_burst_index = 0;
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process.in_cpu = false;
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istringstream iss(line);
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iss >> process.arrival_time;
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int burst_time;
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while (iss >> burst_time && burst_time != -1) {
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process.burst_times.push_back(burst_time);
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}
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processes.push_back(process);
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}
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string algorithm = argv[2];
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if (algorithm == "fifo") {
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fifo();
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} else {
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cout << "Invalid scheduling algorithm. Please use 'fifo'.\n";
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}
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return 0;
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}
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@ -0,0 +1,4 @@
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P1 0 2
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P2 2 4
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P1 6 7
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P2 9 10
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@ -0,0 +1,225 @@
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#include <iostream>
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#include <fstream>
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#include <cstring>
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#include <unistd.h>
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#include <chrono>
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#include <sstream>
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#include <string>
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#include <bits/stdc++.h>
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using namespace std;
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struct process_detail {
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//cpu_burst_times[0] is arrival time
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int pid;
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vector<int> burst_times;
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int in_cpu;
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int ptr;
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};
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struct clock{
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int push_signal; //boolean
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int timer;
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};
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//// operator overloading
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//struct CompareHeight {
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// bool operator()(struct process_detail p1, struct process_detail p2)
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// {
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// // return "true" if "p1" is ordered
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// // before "p2", for example:
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// return p1.height < p2.height;
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// }
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//};
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vector<struct process_detail> processes;
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vector<struct process_detail> ready_queue;
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queue<struct process_detail*> ready_queue_fifo;
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vector<struct process_detail*> waiting;
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struct process_detail* CPU = NULL;
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void fifo() {
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//clock initialized to 0
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struct clock time;
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memset(&time, 0, sizeof(struct clock));
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int process_count = processes.size();
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//ready queue initialized as process 1 will arrive at time 0
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ready_queue_fifo.push(&processes[0]);
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processes[0].ptr++;
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int brk = 0;
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while(true){
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for(int i = 0; i < process_count; ++i) {
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if(processes[i].burst_times[processes[i].ptr] == -1) {
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brk = 1;
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}
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else brk = 0;
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}
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if(brk) break;
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//managing arrival times
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for(int i = 1; i < process_count; ++i) {
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//if process not in cpu
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if(processes[i].in_cpu != 1) {
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if(time.timer == processes[i].burst_times[0]) {
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ready_queue_fifo.push(&processes[i]);
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processes[i].ptr++;
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}
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}
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}
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//THE FIFO RULE
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if(CPU == NULL) {
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CPU = ready_queue_fifo.front();
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CPU->in_cpu = 1;
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ready_queue_fifo.pop();
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}
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else {
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//check cpu_burst complete
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for(int i = 0; i < process_count; ++i) {
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if(processes[i].in_cpu == 1) {
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if(time.push_signal + CPU->burst_times[processes[i].ptr] == time.timer){
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waiting.push_back(CPU); // process added to waiting queue
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CPU->in_cpu = 0;
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CPU = ready_queue_fifo.front(); // process added to CPU
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CPU->in_cpu = 1;
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ready_queue_fifo.pop();
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time.push_signal = time.push_signal + CPU->burst_times[processes[i].ptr] ;
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}
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}
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}
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// removing form waiting list
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for(int j = 0; j < waiting.size(); ++j) {
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if(waiting[j] != NULL) {
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if(waiting[j]->burst_times[waiting[j]->ptr] == 0) {
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ready_queue_fifo.push(waiting[j]);
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waiting[j]->ptr++;
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waiting[j] = NULL;
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}
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else waiting[j]->burst_times[waiting[j]->ptr]--; // reducing the io burst till it reaches 0
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}
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}
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}
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time.timer++;
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}
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cout << "fifo" << endl;
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return;
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}
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int main(int argc, char **argv) {
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if(argc != 3)
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{
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cout <<"usage: ./scheduler.out <path-to-workload-file> <scheduler_algorithm>\nprovided arguments:\n";
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for(int i = 0; i < argc; i++)
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cout << argv[i] << "\n";
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return -1;
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}
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char *file_to_search_in = argv[1];
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char *scheduler_algorithm = argv[2];
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ifstream file(file_to_search_in, ios::binary);
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string buffer;
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int pid = 0;
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while(getline(file, buffer)) {
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if(buffer[0] == '<'){
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continue;
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}
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istringstream iss(buffer);
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string word;
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struct process_detail pd;
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memset(&pd,0,sizeof(struct process_detail));
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pd.pid = pid++;
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pd.ptr = 0;
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while(iss>>word){
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// if(i == 0){
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// pd.cpu_burst_times.push_back(stoi(word));
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// }
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// else if(i % 2 == 0){
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// pd.io_burst_times.push_back(stoi(word));
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// }
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// else if(i % 2 == 1){
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// }
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pd.burst_times.push_back(stoi(word));
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// i++;
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// cout << stoi(word) << endl;
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}
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processes.push_back(pd);
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}
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map<string, int> temp;
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temp["fifo"] = 1;
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string temp1 = scheduler_algorithm;
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switch(temp[temp1]){
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case 1:
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fifo();
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break;
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default:
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cout << "enter fifo" << endl;
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}
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cout << processes[0].in_cpu << endl;
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cout << processes[0].ptr << endl;
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cout << processes[1].in_cpu << endl;
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cout << processes[1].ptr << endl;
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return 0;
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}
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I am writing the above code to as an answer for the following question:
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Process Scheduling
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Laboratory 3
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Duration: 3 weeks
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This assignment will help us learn different process scheduling algorithms and their relative pros
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and cons.
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To do this task, you will need to develop a simulator of a scheduler in C / C++. The simulator
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must take in the following command line arguments: <scheduling-algorithm>
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<path-to-workload-description-file>. The simulator must produce as output the following metrics:
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Makespan, Completion Time (average and maximum), and Waiting Time (average and
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maximum), Run Time of your simulator (not counting I/O). Also, report the schedule itself
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(choose a nice format which will also help you debug).
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For all the studies, we will use the workload description files given here. Each row in the file
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refers to one process. The row format is as follows:
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<process-arrival-time> <cpu-burst-1-duration> <io-burst-1-duration> <cpu-burst-2-duration>
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<io-burst-2-duration> … -1
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For example:
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0 100 2 200 3 25 -1 indicates arrival time = 0; CPU burst 1 duration = 100; I/O burst 1 duration =
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2; CPU burst 2 duration = 200; I/O burst 2 duration = 3; CPU burst 3 duration = 25; end of
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process.
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Assume that every line ends with -1. A process may have any number of CPU / I/O burst
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cycles terminated with a -1. There will be any number of processes, terminated by an end of file.
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The arrival times are in nondecreasing order.
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Part I
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Implement the following algorithms:
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A. First In First Out
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Also here is the input file:
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<html>
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<body>
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<pre>
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0 100 2 -1
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2 80 2 -1
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</pre></body></html>
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Help me write the appropriate code
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Binary file not shown.
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@ -13,9 +13,8 @@ struct process_detail {
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//cpu_burst_times[0] is arrival time
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int pid;
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vector<int> burst_times;
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// vector<int> io_burst_times;
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int in_cpu;
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int ptr = 0;
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int current_burst_index;
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};
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struct clock{
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@ -35,66 +34,112 @@ struct clock{
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//};
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vector<struct process_detail> processes;
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vector<struct process_detail> ready_queue;
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queue<struct process_detail> ready_queue_fifo;
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vector<struct process_detail> waiting;
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vector<process_detail> processes;
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queue<process_detail*> ready_queue_fifo;
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vector<process_detail*> waiting;
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struct process_detail* CPU = NULL;
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int clock = 0;
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ofstream output_file("cpu_times.txt");
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void fifo() {
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//clock initialized to 0
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struct clock time;
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memset(&time, 0, sizeof(struct clock));
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time.timer = 0;
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time.push_signal = 0;
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int process_count = processes.size();
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int completed_processes = 0;
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//ready queue initialized as process 1 will arrive at time 0
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ready_queue_fifo.push(processes[0]);
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processes[0].i++;
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while(completed_processes < process_count){
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while(true){
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// breaking from the infinite loop
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for(int i = 0; i < process_count; ++i) {
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if(processes[i].burst_times[processes[i].current_burst_index] == -1) {
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completed_processes++;
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}
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}
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//managing arrival times
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for(int i = 0; i < process_count; ++i) {
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//if process not in cpu
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if(proccesses[i].in_cpu != 1) {
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if(processes[i].in_cpu != 1) {
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if(time.timer == processes[i].burst_times[0]) {
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ready_queue_fifo.push(processes[ptr]);
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processes[i].i++;
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ready_queue_fifo.push(&processes[i]);
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processes[i].current_burst_index++;
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}
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}
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}
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//THE FIFO RULE
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if(CPU == NULL) {
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if(CPU == NULL && !ready_queue_fifo.empty()) {
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CPU = ready_queue_fifo.front();
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CPU->in_cpu = 1;
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// Record in_time when the process enters the CPU
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CPU->burst_times[CPU->current_burst_index]--;
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output_file << "P" << CPU->pid+1 << " " << time.timer;
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ready_queue_fifo.pop();
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}
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else{
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// else if(CPU == NULL && ready_queue_fifo.empty()) {
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// // removing form waiting list
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// for(int j = 0; j < waiting.size(); ++j) {
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// if(waiting[j] != NULL) {
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// if(waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
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// ready_queue_fifo.push(waiting[j]);
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// waiting[j]->current_burst_index++;
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// waiting[j] = NULL;
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// }
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// else waiting[j]->burst_times[waiting[j]->current_burst_index]--; // reducing the io burst till it reaches 0
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// }
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// }
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// time.push_signal++;
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// }
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else {
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// removing form waiting list
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for(int j = 0; j < waiting.size(); ++j) {
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if(waiting[j] != NULL) {
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if(waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
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ready_queue_fifo.push(waiting[j]);
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waiting[j]->current_burst_index++;
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waiting[j] = NULL;
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}
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else waiting[j]->burst_times[waiting[j]->current_burst_index]--; // reducing the io burst till it reaches 0
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}
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}
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//check cpu_burst complete
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for(int i = 0; i < process_count; ++i) {
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if(proccesses[i].in_cpu == 1) {
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if(timer.push_signal + CPU->burst_times[ptr] == time.timer){
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waiting.push_back(CPU); // process added to waiting queue
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if(processes[i].in_cpu == 1 && CPU != NULL) {
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if(CPU->burst_times[processes[i].current_burst_index] == 0){
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// Record out_time when the process exits the CPU
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output_file << " " << time.timer << endl;
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// time.push_signal = time.push_signal + CPU->burst_times[processes[i].current_burst_index] ;
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CPU->in_cpu = 0;
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CPU = ready_queue_fifo.front(); // process added to CPU
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CPU->in_cpu = 1;
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ready_queue_fifo.pop();
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timer.push_signal = timer.push_signal + CPU->burst_times[ptr] ;
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CPU->current_burst_index++;
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// CPU->burst_times[CPU->current_burst_index]--;
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waiting.push_back(CPU); // process added to waiting queue
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if(!ready_queue_fifo.empty()) {
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CPU = ready_queue_fifo.front(); // process added to CPU
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CPU->in_cpu = 1;
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// CPU->burst_times[CPU->current_burst_index]--;
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output_file << "P" << CPU->pid+1 << " " << time.timer; // New entry time
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ready_queue_fifo.pop();
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}
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else {
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CPU = NULL;
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}
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}
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else CPU->burst_times[CPU->current_burst_index]--;
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}
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}
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|
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// removing form wait
|
||||
|
||||
|
||||
}
|
||||
time.timer++;
|
||||
|
||||
// completed_processes++;
|
||||
}
|
||||
|
||||
output_file.close();
|
||||
cout << "fifo" << endl;
|
||||
return;
|
||||
}
|
||||
|
|
@ -113,8 +158,9 @@ int main(int argc, char **argv) {
|
|||
char *scheduler_algorithm = argv[2];
|
||||
|
||||
ifstream file(file_to_search_in, ios::binary);
|
||||
// ifstream file("process1.dat", ios::binary);
|
||||
string buffer;
|
||||
int pid = 1;
|
||||
int pid = 0;
|
||||
|
||||
while(getline(file, buffer)) {
|
||||
if(buffer[0] == '<'){
|
||||
|
|
@ -124,6 +170,8 @@ int main(int argc, char **argv) {
|
|||
string word;
|
||||
struct process_detail pd;
|
||||
memset(&pd,0,sizeof(struct process_detail));
|
||||
pd.pid = pid++;
|
||||
pd.current_burst_index = 0;
|
||||
|
||||
while(iss>>word){
|
||||
// if(i == 0){
|
||||
|
|
@ -138,13 +186,13 @@ int main(int argc, char **argv) {
|
|||
// i++;
|
||||
// cout << stoi(word) << endl;
|
||||
}
|
||||
pd.pid = pid;
|
||||
processes.push_back(pd);
|
||||
}
|
||||
|
||||
map<string, int> temp;
|
||||
temp["fifo"] = 1;
|
||||
string temp1 = scheduler_algorithm;
|
||||
// string temp1 = "fifo";
|
||||
|
||||
|
||||
switch(temp[temp1]){
|
||||
|
|
@ -154,5 +202,16 @@ int main(int argc, char **argv) {
|
|||
default:
|
||||
cout << "enter fifo" << endl;
|
||||
}
|
||||
|
||||
// cout << processes[0].in_cpu << endl;
|
||||
// cout << processes[0].current_burst_index << endl;
|
||||
|
||||
// cout << processes[1].in_cpu << endl;
|
||||
// cout << processes[1].current_burst_index << endl;
|
||||
|
||||
// cout << ready_queue_fifo.front()->pid << endl;
|
||||
// ready_queue_fifo.pop();
|
||||
// cout << ready_queue_fifo.front()->pid << endl;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,6 @@
|
|||
<html>
|
||||
<body>
|
||||
<pre>
|
||||
0 2 2 1 -1
|
||||
1 2 2 1 -1
|
||||
</pre></body></html>
|
||||
Loading…
Reference in New Issue