lab 3 halway
This commit is contained in:
jazzy1902
parent
5bd1211f9e
commit
0361dedfab
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@ -0,0 +1,390 @@
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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_cpu1;
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int in_cpu2;
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int current_burst_index;
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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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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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process_detail* CPU1 = NULL;
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process_detail* CPU2 = NULL;
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ofstream output_file("cpu_times.txt");
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// ------------------------------------- THE FIFO ---------------------------------------
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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 = 5;
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int process_count = processes.size();
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int completed_processes = 0;
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string out_string1 = "";
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string out_string2 = "";
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while(completed_processes < process_count) {
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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] == -2) {
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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(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 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].current_burst_index++;
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}
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}
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}
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// Managing waiting queue
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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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}
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}
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if (CPU1 == NULL && !ready_queue_fifo.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU1 = ready_queue_fifo.front();
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CPU1->in_cpu1 = 1;
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// Record in_time when the process enters the CPU
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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// output_file << "P" << CPU1->pid + 1 << ",1 " << time.timer;
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ready_queue_fifo.pop();
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}
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if (CPU2 == NULL && !ready_queue_fifo.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU2 = ready_queue_fifo.front();
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CPU2->in_cpu2 = 1;
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// Record in_time when the process enters the CPU
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// output_file << endl;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid + 1 << ",2 " << time.timer;
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ready_queue_fifo.pop();
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}
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// Check CPU1
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if(CPU1 != NULL) {
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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_cpu1 == 1) {
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if(CPU1->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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out_string1 += " " + to_string(time.timer);
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output_file << out_string1 << endl;
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// output_file << " " << time.timer << endl;
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CPU1->in_cpu1 = 0;
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CPU1->current_burst_index++;
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waiting.push_back(CPU1); // process added to waiting queue
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if(!ready_queue_fifo.empty()) {
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CPU1 = ready_queue_fifo.front(); // process added to CPU
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CPU1->in_cpu1 = 1;
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// output_file << "P" << CPU1->pid+1 << ",1" << " " << time.timer; // New entry time
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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ready_queue_fifo.pop();
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}
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else {
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CPU1 = NULL;
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}
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}
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}
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}
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}
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if(CPU2 != NULL) {
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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_cpu2 == 1) {
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if(CPU2->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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out_string2 += " " + to_string(time.timer);
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output_file << out_string2 << endl;
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// output_file << " " << time.timer << endl;
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CPU2->in_cpu2 = 0;
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CPU2->current_burst_index++;
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waiting.push_back(CPU2); // process added to waiting queue
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if(!ready_queue_fifo.empty()) {
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CPU2 = ready_queue_fifo.front(); // process added to CPU
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CPU2->in_cpu2 = 1;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid+1 << ",2" << " " << 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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CPU2 = NULL;
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}
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}
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}
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}
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}
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if(CPU1 != NULL) {
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CPU1->burst_times[CPU1->current_burst_index]--;
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}
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if(CPU2 != NULL) {
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CPU2->burst_times[CPU2->current_burst_index]--;
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}
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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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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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}
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// Increment the timer
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time.timer++;
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}
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output_file.close();
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return;
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}
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// ----------------------------------------THE Shortest Job First----------------------------------
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// Custom comparator for the priority queue
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struct Compare {
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bool operator()(process_detail* a, process_detail* b) {
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// Compare the elements in the vector at the given indices
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return a->burst_times[a->current_burst_index] > b->burst_times[b->current_burst_index];
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}
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};
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priority_queue<process_detail*, vector<process_detail*>, Compare> ready_queue;
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void sjf() {
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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 = 5;
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int process_count = processes.size();
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int completed_processes = 0;
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string out_string1 = "";
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string out_string2 = "";
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while(completed_processes < process_count) {
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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] == -2) {
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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(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
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if(time.timer == processes[i].burst_times[0]) {
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ready_queue.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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// Managing waiting queue
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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.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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}
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}
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if (CPU1 == NULL && !ready_queue.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU1 = ready_queue.top();
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CPU1->in_cpu1 = 1;
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// Record in_time when the process enters the CPU
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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// output_file << "P" << CPU1->pid + 1 << ",1 " << time.timer;
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ready_queue.pop();
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}
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if (CPU2 == NULL && !ready_queue.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU2 = ready_queue.top();
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CPU2->in_cpu2 = 1;
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// Record in_time when the process enters the CPU
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// output_file << endl;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid + 1 << ",2 " << time.timer;
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ready_queue.pop();
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}
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// Check CPU1
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if(CPU1 != NULL) {
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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_cpu1 == 1) {
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if(CPU1->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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out_string1 += " " + to_string(time.timer);
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output_file << out_string1 << endl;
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// output_file << " " << time.timer << endl;
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CPU1->in_cpu1 = 0;
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CPU1->current_burst_index++;
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waiting.push_back(CPU1); // process added to waiting queue
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if(!ready_queue.empty()) {
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CPU1 = ready_queue.top(); // process added to CPU
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CPU1->in_cpu1 = 1;
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// output_file << "P" << CPU1->pid+1 << ",1" << " " << time.timer; // New entry time
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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ready_queue.pop();
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}
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else {
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CPU1 = NULL;
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}
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}
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}
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}
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}
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if(CPU2 != NULL) {
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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_cpu2 == 1) {
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if(CPU2->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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out_string2 += " " + to_string(time.timer);
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output_file << out_string2 << endl;
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// output_file << " " << time.timer << endl;
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CPU2->in_cpu2 = 0;
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CPU2->current_burst_index++;
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waiting.push_back(CPU2); // process added to waiting queue
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if(!ready_queue.empty()) {
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CPU2 = ready_queue.top(); // process added to CPU
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CPU2->in_cpu2 = 1;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid+1 << ",2" << " " << time.timer; // New entry time
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ready_queue.pop();
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}
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else {
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CPU2 = NULL;
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}
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}
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}
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}
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}
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if(CPU1 != NULL) {
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CPU1->burst_times[CPU1->current_burst_index]--;
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}
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if(CPU2 != NULL) {
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CPU2->burst_times[CPU2->current_burst_index]--;
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}
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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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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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}
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// Increment the timer
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time.timer++;
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}
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output_file.close();
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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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// ifstream file("temp.dat", 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.current_burst_index = 0;
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while(iss>>word){
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pd.burst_times.push_back(stoi(word));
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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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temp["sjf"] = 2;
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temp["pre_sjf"] = 3;
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temp["rr"] = 4;
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string temp1 = scheduler_algorithm;
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// string temp1 = "fifo";
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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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case 2:
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sjf();
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break;
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// case 3:
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// pre_sjf();
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// break;
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// case 4:
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// round_robin();
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// break;
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default:
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cout << "enter fifo or sjf or pre_sjf or rr" << endl;
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}
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return 0;
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}
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225
lab3/prompt
225
lab3/prompt
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@ -1,225 +0,0 @@
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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;
|
||||
ready_queue_fifo.pop();
|
||||
time.push_signal = time.push_signal + CPU->burst_times[processes[i].ptr] ;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// removing form waiting list
|
||||
|
||||
for(int j = 0; j < waiting.size(); ++j) {
|
||||
if(waiting[j] != NULL) {
|
||||
if(waiting[j]->burst_times[waiting[j]->ptr] == 0) {
|
||||
ready_queue_fifo.push(waiting[j]);
|
||||
waiting[j]->ptr++;
|
||||
waiting[j] = NULL;
|
||||
}
|
||||
else waiting[j]->burst_times[waiting[j]->ptr]--; // reducing the io burst till it reaches 0
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
time.timer++;
|
||||
}
|
||||
|
||||
cout << "fifo" << endl;
|
||||
return;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
|
||||
if(argc != 3)
|
||||
{
|
||||
cout <<"usage: ./scheduler.out <path-to-workload-file> <scheduler_algorithm>\nprovided arguments:\n";
|
||||
for(int i = 0; i < argc; i++)
|
||||
cout << argv[i] << "\n";
|
||||
return -1;
|
||||
}
|
||||
|
||||
char *file_to_search_in = argv[1];
|
||||
char *scheduler_algorithm = argv[2];
|
||||
|
||||
ifstream file(file_to_search_in, ios::binary);
|
||||
string buffer;
|
||||
int pid = 0;
|
||||
|
||||
while(getline(file, buffer)) {
|
||||
if(buffer[0] == '<'){
|
||||
continue;
|
||||
}
|
||||
istringstream iss(buffer);
|
||||
string word;
|
||||
struct process_detail pd;
|
||||
memset(&pd,0,sizeof(struct process_detail));
|
||||
pd.pid = pid++;
|
||||
pd.ptr = 0;
|
||||
|
||||
while(iss>>word){
|
||||
// if(i == 0){
|
||||
// pd.cpu_burst_times.push_back(stoi(word));
|
||||
// }
|
||||
// else if(i % 2 == 0){
|
||||
// pd.io_burst_times.push_back(stoi(word));
|
||||
// }
|
||||
// else if(i % 2 == 1){
|
||||
// }
|
||||
pd.burst_times.push_back(stoi(word));
|
||||
// i++;
|
||||
// cout << stoi(word) << endl;
|
||||
}
|
||||
processes.push_back(pd);
|
||||
}
|
||||
|
||||
map<string, int> temp;
|
||||
temp["fifo"] = 1;
|
||||
string temp1 = scheduler_algorithm;
|
||||
|
||||
|
||||
switch(temp[temp1]){
|
||||
case 1:
|
||||
fifo();
|
||||
break;
|
||||
default:
|
||||
cout << "enter fifo" << endl;
|
||||
}
|
||||
|
||||
cout << processes[0].in_cpu << endl;
|
||||
cout << processes[0].ptr << endl;
|
||||
|
||||
cout << processes[1].in_cpu << endl;
|
||||
cout << processes[1].ptr << endl;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
I am writing the above code to as an answer for the following question:
|
||||
Process Scheduling
|
||||
Laboratory 3
|
||||
Duration: 3 weeks
|
||||
This assignment will help us learn different process scheduling algorithms and their relative pros
|
||||
and cons.
|
||||
To do this task, you will need to develop a simulator of a scheduler in C / C++. The simulator
|
||||
must take in the following command line arguments: <scheduling-algorithm>
|
||||
<path-to-workload-description-file>. The simulator must produce as output the following metrics:
|
||||
Makespan, Completion Time (average and maximum), and Waiting Time (average and
|
||||
maximum), Run Time of your simulator (not counting I/O). Also, report the schedule itself
|
||||
(choose a nice format which will also help you debug).
|
||||
For all the studies, we will use the workload description files given here. Each row in the file
|
||||
refers to one process. The row format is as follows:
|
||||
<process-arrival-time> <cpu-burst-1-duration> <io-burst-1-duration> <cpu-burst-2-duration>
|
||||
<io-burst-2-duration> … -1
|
||||
For example:
|
||||
0 100 2 200 3 25 -1 indicates arrival time = 0; CPU burst 1 duration = 100; I/O burst 1 duration =
|
||||
2; CPU burst 2 duration = 200; I/O burst 2 duration = 3; CPU burst 3 duration = 25; end of
|
||||
process.
|
||||
Assume that every line ends with -1. A process may have any number of CPU / I/O burst
|
||||
cycles terminated with a -1. There will be any number of processes, terminated by an end of file.
|
||||
The arrival times are in nondecreasing order.
|
||||
Part I
|
||||
Implement the following algorithms:
|
||||
A. First In First Out
|
||||
|
||||
|
||||
Also here is the input file:
|
||||
<html>
|
||||
<body>
|
||||
<pre>
|
||||
0 100 2 -1
|
||||
2 80 2 -1
|
||||
</pre></body></html>
|
||||
|
||||
|
||||
Help me write the appropriate code
|
||||
Loading…
Reference in New Issue