2 also cpu completed

This commit is contained in:
jazzy1902 2024-09-26 03:44:04 +05:30
parent 296c926b7e
commit b032ac4783
7 changed files with 517 additions and 171 deletions

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@ -1,124 +0,0 @@
#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <queue>
#include <iomanip>
using namespace std;
struct Process {
int pid;
int arrival_time;
vector<int> burst_times;
int current_burst_index;
int completion_time;
int waiting_time;
int turnaround_time;
bool in_cpu;
};
vector<Process> processes;
void fifo() {
queue<Process*> ready_queue;
int current_time = 0;
int completed_processes = 0;
int process_count = processes.size();
while (completed_processes < process_count) {
// Add processes to the ready queue based on arrival time
for (auto& process : processes) {
if (process.arrival_time <= current_time && !process.in_cpu) {
ready_queue.push(&process);
process.in_cpu = true;
}
}
if (!ready_queue.empty()) {
Process* current_process = ready_queue.front();
ready_queue.pop();
// Simulate CPU execution
for (int i = current_process->current_burst_index; i < current_process->burst_times.size(); i += 2) {
int cpu_burst = current_process->burst_times[i];
current_time += cpu_burst; // Advance time by CPU burst duration
current_process->current_burst_index++;
// Handle I/O burst if there's one
if (i + 1 < current_process->burst_times.size()) {
int io_burst = current_process->burst_times[i + 1];
current_time += io_burst; // Advance time by I/O burst duration
}
}
current_process->completion_time = current_time;
current_process->turnaround_time = current_process->completion_time - current_process->arrival_time;
current_process->waiting_time = current_process->turnaround_time - (current_process->burst_times.size() / 2);
completed_processes++;
} else {
// No process is ready; advance time
current_time++;
}
}
// Calculate averages
int total_waiting_time = 0, total_turnaround_time = 0;
for (const auto& process : processes) {
total_waiting_time += process.waiting_time;
total_turnaround_time += process.turnaround_time;
}
double avg_waiting_time = static_cast<double>(total_waiting_time) / process_count;
double avg_turnaround_time = static_cast<double>(total_turnaround_time) / process_count;
// Output results
cout << "FIFO Scheduling Results:\n";
cout << "Processes:\n";
for (const auto& process : processes) {
cout << "Process ID: " << process.pid
<< ", Completion Time: " << process.completion_time
<< ", Waiting Time: " << process.waiting_time
<< ", Turnaround Time: " << process.turnaround_time << endl;
}
cout << "Average Waiting Time: " << fixed << setprecision(2) << avg_waiting_time << endl;
cout << "Average Turnaround Time: " << fixed << setprecision(2) << avg_turnaround_time << endl;
}
int main(int argc, char** argv) {
if (argc != 3) {
cout << "Usage: ./scheduler.out <path-to-workload-file> <scheduler_algorithm>\n";
return -1;
}
ifstream file(argv[1]);
string line;
int pid = 0;
while (getline(file, line)) {
if (line.empty()) continue;
Process process;
process.pid = pid++;
process.current_burst_index = 0;
process.in_cpu = false;
istringstream iss(line);
iss >> process.arrival_time;
int burst_time;
while (iss >> burst_time && burst_time != -1) {
process.burst_times.push_back(burst_time);
}
processes.push_back(process);
}
string algorithm = argv[2];
if (algorithm == "fifo") {
fifo();
} else {
cout << "Invalid scheduling algorithm. Please use 'fifo'.\n";
}
return 0;
}

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@ -1,9 +1,287 @@
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@ -16,41 +16,44 @@ struct process_detail {
int in_cpu1;
int in_cpu2;
int current_burst_index;
int arrvival_time = 0;
int wait_time = 0;
int cpu_time = 0;
int completion_time = 0;
};
struct clock{
int push_signal; //boolean
int timer;
};
vector<process_detail> processes;
queue<process_detail*> ready_queue_fifo;
vector<process_detail*> waiting;
process_detail* CPU1 = NULL;
process_detail* CPU2 = NULL;
vector<string> out_cpu1;
vector<string> out_cpu2;
ofstream output_file("cpu_times.txt");
// ------------------------------------- THE FIFO ---------------------------------------
void fifo() {
// Clock initialized to 0
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
time.push_signal = 5;
int process_count = processes.size();
int completed_processes = 0;
string out_string1 = "";
string out_string2 = "";
vector<process_detail*> waiting(process_count, NULL);
while(completed_processes < process_count) {
// Breaking from the infinite loop
for (int i = 0; i < process_count; ++i) {
if (processes[i].burst_times[processes[i].current_burst_index] == -2) {
for (int j = 0; j < process_count; ++j) {
if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
waiting[j] = NULL;
completed_processes++;
}
}
@ -59,6 +62,7 @@ void fifo() {
for (int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
if(time.timer == processes[i].burst_times[0]) {
processes[i].arrvival_time = time.timer;
ready_queue_fifo.push(&processes[i]);
processes[i].current_burst_index++;
}
@ -96,12 +100,13 @@ void fifo() {
//check cpu_burst complete
for(int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu1 == 1) {
processes[i].cpu_time += 1;
if(CPU1->burst_times[processes[i].current_burst_index] == 0){
out_string1 += " " + to_string(time.timer);
out_cpu1.push_back(out_string1);
CPU1->in_cpu1 = 0;
CPU1->current_burst_index++;
waiting.push_back(CPU1); // process added to waiting queue
waiting[CPU1->pid] = CPU1; // process added to waiting queue
if(!ready_queue_fifo.empty()) {
CPU1 = ready_queue_fifo.front(); // process added to CPU
CPU1->in_cpu1 = 1;
@ -120,12 +125,13 @@ void fifo() {
//check cpu_burst complete
for(int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu2 == 1) {
processes[i].cpu_time += 1;
if(CPU2->burst_times[processes[i].current_burst_index] == 0){
out_string2 += " " + to_string(time.timer);
out_cpu2.push_back(out_string2);
CPU2->in_cpu2 = 0;
CPU2->current_burst_index++;
waiting.push_back(CPU2); // process added to waiting queue
waiting[CPU2->pid] = CPU2; // process added to waiting queue
if(!ready_queue_fifo.empty()) {
CPU2 = ready_queue_fifo.front(); // process added to CPU
CPU2->in_cpu2 = 1;
@ -158,7 +164,6 @@ void fifo() {
// Increment the timer
time.timer++;
}
// output_file.close();
return;
}
@ -168,7 +173,16 @@ void fifo() {
struct Compare {
bool operator()(process_detail* a, process_detail* b) {
// Compare the elements in the vector at the given indices
return a->burst_times[a->current_burst_index] > b->burst_times[b->current_burst_index];
if (a->current_burst_index == 0) {
return a->burst_times[a->current_burst_index + 1] > b->burst_times[b->current_burst_index];
}
else if(b->current_burst_index == 0) {
return a->burst_times[a->current_burst_index] > b->burst_times[b->current_burst_index+1];
}
else if(b->current_burst_index == 0 && a->current_burst_index == 0)
return a->burst_times[a->current_burst_index+1] > b->burst_times[b->current_burst_index+1];
else return a->burst_times[a->current_burst_index] > b->burst_times[b->current_burst_index];
}
};
@ -179,17 +193,19 @@ void sjf() {
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
time.push_signal = 5;
int process_count = processes.size();
int completed_processes = 0;
vector<process_detail*> waiting(process_count, NULL);
string out_string1 = "";
string out_string2 = "";
while(completed_processes < process_count) {
// Breaking from the infinite loop
for (int i = 0; i < process_count; ++i) {
if (processes[i].burst_times[processes[i].current_burst_index] == -2) {
// breaking from the infinite loop
for (int j = 0; j < process_count; ++j) {
if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
waiting[j] = NULL;
completed_processes++;
}
}
@ -241,6 +257,7 @@ void sjf() {
//check cpu_burst complete
for(int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu1 == 1) {
processes[i].cpu_time += 1;
if(CPU1->burst_times[processes[i].current_burst_index] == 0){
// Record out_time when the process exits the CPU
out_string1 += " " + to_string(time.timer);
@ -248,7 +265,7 @@ void sjf() {
out_cpu1.push_back(out_string1);
CPU1->in_cpu1 = 0;
CPU1->current_burst_index++;
waiting.push_back(CPU1); // process added to waiting queue
waiting[CPU1->pid] = CPU1; // process added to waiting queue
if(!ready_queue.empty()) {
CPU1 = ready_queue.top(); // process added to CPU
CPU1->in_cpu1 = 1;
@ -267,6 +284,7 @@ void sjf() {
//check cpu_burst complete
for(int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu2 == 1) {
processes[i].cpu_time += 1;
if(CPU2->burst_times[processes[i].current_burst_index] == 0){
// Record out_time when the process exits the CPU
out_string2 += " " + to_string(time.timer);
@ -274,7 +292,7 @@ void sjf() {
out_cpu2.push_back(out_string2);
CPU2->in_cpu2 = 0;
CPU2->current_burst_index++;
waiting.push_back(CPU2); // process added to waiting queue
waiting[CPU2->pid] = CPU2; // process added to waiting queue
if(!ready_queue.empty()) {
CPU2 = ready_queue.top(); // process added to CPU
CPU2->in_cpu2 = 1;
@ -307,7 +325,6 @@ void sjf() {
// Increment the timer
time.timer++;
}
// output_file.close();
return;
}
// --------------------------- The Pre-emptive Shortest Job First ---------------------------------
@ -318,17 +335,20 @@ void pre_sjf() {
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
time.push_signal = 5;
int process_count = processes.size();
int completed_processes = 0;
string out_string1 = "";
string out_string2 = "";
vector<process_detail*> waiting(process_count, NULL);
while(completed_processes < process_count) {
// Breaking from the infinite loop
for (int i = 0; i < process_count; ++i) {
if (processes[i].burst_times[processes[i].current_burst_index] == -2) {
// breaking from the infinite loop
for (int j = 0; j < process_count; ++j) {
if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
waiting[j] = NULL;
completed_processes++;
}
}
@ -436,7 +456,7 @@ void pre_sjf() {
out_cpu1.push_back(out_string1);
CPU1->in_cpu1 = 0;
CPU1->current_burst_index++;
waiting.push_back(CPU1); // process added to waiting queue
waiting[CPU1->pid] = CPU1; // process added to waiting queue
if(!ready_queue.empty()) {
CPU1 = ready_queue.top(); // process added to CPU
CPU1->in_cpu1 = 1;
@ -462,7 +482,7 @@ void pre_sjf() {
out_cpu2.push_back(out_string2);
CPU2->in_cpu2 = 0;
CPU2->current_burst_index++;
waiting.push_back(CPU2); // process added to waiting queue
waiting[CPU2->pid] = CPU2;// process added to waiting queue
if(!ready_queue.empty()) {
CPU2 = ready_queue.top(); // process added to CPU
CPU2->in_cpu2 = 1;
@ -495,10 +515,167 @@ void pre_sjf() {
// Increment the timer
time.timer++;
}
// output_file.close();
return;
}
// ---------------------------------- The Round Robin--------------------------------------------
void round_robin() {
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
int process_count = processes.size();
int completed_processes = 0;
int time_quantum = 5;
int current_quantum1 = 0;
int current_quantum2 = 0;
string out_string1 = "";
string out_string2 = "";
// Initialize waiting vector with NULLs for each process slot
vector<process_detail*> waiting(process_count, NULL);
while (completed_processes < process_count) {
// Check for process completion
for (int j = 0; j < process_count; ++j) {
if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] == -2) {
waiting[j]->completion_time = time.timer - waiting[j]->arrvival_time - 1;
waiting[j] = NULL;
completed_processes++;
}
}
// Managing arrival times
for (int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
if(time.timer == processes[i].burst_times[0]) {
processes[i].arrvival_time = time.timer;
ready_queue_fifo.push(&processes[i]);
processes[i].current_burst_index++;
}
}
}
// Managing waiting queue
for (int j = 0; j < waiting.size(); ++j) {
if (waiting[j] != NULL) {
if (waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
ready_queue_fifo.push(waiting[j]);
waiting[j]->current_burst_index++;
waiting[j] = NULL;
}
}
}
// Assign a process to CPU1 if available
if (CPU1 == NULL && !ready_queue_fifo.empty()) {
CPU1 = ready_queue_fifo.front();
CPU1->in_cpu1 = 1;
out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
// output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
ready_queue_fifo.pop();
current_quantum1 = time_quantum;
}
// Assign a process to CPU2 if available
if (CPU2 == NULL && !ready_queue_fifo.empty()) {
CPU2 = ready_queue_fifo.front();
CPU2->in_cpu2 = 1;
out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
// output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
ready_queue_fifo.pop();
current_quantum2 = time_quantum;
}
if (CPU1 != NULL) {
for(int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu1 == 1){
processes[i].cpu_time += 1;
if (CPU1->burst_times[CPU1->current_burst_index] == 0 || current_quantum1 == 0) {
// output_file << " " << time.timer << endl;
out_string1 += " " + to_string(time.timer);
out_cpu1.push_back(out_string1);
CPU1->in_cpu1 = 0;
if (CPU1->burst_times[CPU1->current_burst_index] == 0){
CPU1->current_burst_index++;
waiting[CPU1->pid] = CPU1;
}
else if (current_quantum1 == 0) ready_queue_fifo.push(CPU1);
// Place the process in its corresponding waiting slot by pid
if (!ready_queue_fifo.empty()) {
CPU1 = ready_queue_fifo.front();
CPU1->in_cpu1 = 1;
out_string1 = "P" + to_string(CPU1->pid+1) + "," + to_string((CPU1->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
// output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
ready_queue_fifo.pop();
current_quantum1 = time_quantum;
} else {
CPU1 = NULL;
}
}
}
}
}
if (CPU2 != NULL) {
for(int i = 0; i < process_count; ++i) {
if(processes[i].in_cpu2 == 1){
processes[i].cpu_time += 1;
if (CPU2->burst_times[CPU2->current_burst_index] == 0 || current_quantum2 == 0) {
// output_file << " " << time.timer << endl;
out_string2 += " " + to_string(time.timer);
out_cpu2.push_back(out_string2);
CPU2->in_cpu2 = 0;
if (CPU2->burst_times[CPU2->current_burst_index] == 0){
CPU2->current_burst_index++;
waiting[CPU2->pid] = CPU2;
}
else if (current_quantum2 == 0) ready_queue_fifo.push(CPU2);
// Place the process in its corresponding waiting slot by pid
if (!ready_queue_fifo.empty()) {
CPU2 = ready_queue_fifo.front();
CPU2->in_cpu2 = 1;
out_string2 = "P" + to_string(CPU2->pid+1) + "," + to_string((CPU2->current_burst_index + 1 ) / 2) + " " + to_string(time.timer);
// output_file << "P" << CPU->pid + 1 << "," << (CPU->current_burst_index + 1) / 2 << " " << time.timer;
ready_queue_fifo.pop();
current_quantum2 = time_quantum;
} else {
CPU2 = NULL;
}
}
}
}
}
if(CPU1 != NULL) {
CPU1->burst_times[CPU1->current_burst_index]--;
current_quantum1--;
}
if(CPU2 != NULL) {
CPU2->burst_times[CPU2->current_burst_index]--;
current_quantum2--;
}
// Manage IO bursts in waiting queue
for (int j = 0; j < process_count; ++j) {
if (waiting[j] != NULL && waiting[j]->burst_times[waiting[j]->current_burst_index] != 0) {
waiting[j]->burst_times[waiting[j]->current_burst_index]--;
}
}
// Increment the timer
time.timer++;
}
}
int main(int argc, char **argv) {
if(argc != 3)
@ -543,6 +720,9 @@ int main(int argc, char **argv) {
string temp1 = scheduler_algorithm;
// string temp1 = "pre_sjf";
// Start time point
auto start = std::chrono::high_resolution_clock::now();
switch(temp[temp1]){
case 1:
fifo();
@ -553,12 +733,15 @@ int main(int argc, char **argv) {
case 3:
pre_sjf();
break;
// case 4:
// round_robin();
// break;
case 4:
round_robin();
break;
default:
cout << "enter fifo or sjf or pre_sjf or rr" << endl;
}
auto end = std::chrono::high_resolution_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
output_file << "CPU1" << endl;
for(int i = 0; i < out_cpu1.size(); ++i) {
output_file << out_cpu1[i] << endl;
@ -568,5 +751,21 @@ int main(int argc, char **argv) {
for(int i = 0; i < out_cpu2.size(); ++i) {
output_file << out_cpu2[i] << endl;
}
float tot = 0;
int count = processes.size();
for(int i = 0; i < processes.size(); ++i) {
tot += processes[i].completion_time;
cout << "Process " << i+1 << " Completion Time: " << processes[i].completion_time << endl;
}
cout << "Average Completion Time: " << tot/count << endl;
tot = 0;
for(int i = 0; i < processes.size(); ++i) {
tot += processes[i].completion_time - processes[i].cpu_time;
cout << "Process " << i+1 << " Waiting Time: " << processes[i].completion_time - processes[i].cpu_time << endl;
// cout << "Process " << i+1 << " Waiting Time: " << processes[i].wait_time << endl;
}
cout << "Average Waiting Time: " << tot/count << endl;
std::cout << "Execution time: " << duration.count() << " ms" << std::endl;
return 0;
}

View File

@ -22,15 +22,12 @@ struct process_detail {
};
struct clock{
int push_signal; //boolean
int timer;
};
vector<process_detail> processes;
queue<process_detail*> ready_queue_fifo;
struct process_detail* CPU = NULL;
ofstream output_file("cpu_times.txt");
vector<string> out_strings;
@ -43,7 +40,6 @@ void fifo() {
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
time.push_signal = 0;
int process_count = processes.size();
int completed_processes = 0;
vector<process_detail*> waiting(process_count, NULL);
@ -169,7 +165,6 @@ void sjf() {
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
time.push_signal = 0;
int process_count = processes.size();
int completed_processes = 0;
// Initialize waiting vector with NULLs for each process slot
@ -276,7 +271,6 @@ void pre_sjf() {
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
time.push_signal = 0;
int process_count = processes.size();
int completed_processes = 0;
// Initialize waiting vector with NULLs for each process slot
@ -404,12 +398,11 @@ void pre_sjf() {
// ------------------------------------------- Round Robin --------------------------------------------------
// vector<process_detail*> waiting;
void round_robin() {
struct clock time;
memset(&time, 0, sizeof(struct clock));
time.timer = 0;
time.push_signal = 0;
int process_count = processes.size();
int completed_processes = 0;
int time_quantum = 5;