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Commit 378ccaf

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1 parent 69dd0bf commit 378ccaf

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5 files changed

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5 files changed

+572
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‎Part2/Code/fifo.cpp‎

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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 <unordered_set>
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using namespace std;
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//FIFO implementation
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int ffPR(const vector<int>& rStr, int fC) { //rstr as referenceString, fC as frameCount
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unordered_set<int> fam; //frames as fam, pagesQueue as pgQ
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queue<int> pgQ; // To maintain the fifo order
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int pgF = 0; //pageFaults as pgF
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for (int pg : rStr) { //page as pg
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if (fam.find(pg) == fam.end()) {
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pgF++;
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// If memory is full, remove the oldest page
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if (fam.size() == fC) {
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int oldPG = pgQ.front();
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pgQ.pop();
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fam.erase(oldPG);
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}
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// Add the new page to memory and the queue
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fam.insert(pg);
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pgQ.push(pg);
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}
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}
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return pgF;
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}
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void pTC(const string& fileName) { //pTC as processTestCase
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ifstream file(fileName);
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if (!file.is_open()) {
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cerr << "Error: Could not open file " << fileName << endl;
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return;
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}
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string line;
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vector<int> rStr;
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int fC = 0;
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while (getline(file, line)) {
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if (line.find("Reference String:") != string::npos) {
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// Extract reference string
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stringstream ss(line.substr(line.find(":") + 1));
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int pg;
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while (ss >> pg) {
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rStr.push_back(pg);
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if (ss.peek() == ',') ss.ignore();
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}
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} else if (line.find("Frame Count:") != string::npos) {
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// Extract frame count
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fC = stoi(line.substr(line.find(":") + 1));
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}
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}
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file.close();
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int totlPgF = ffPR(rStr, fC);
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cout << "File: " << fileName << endl;
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cout << "Reference String: ";
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for (int pg : rStr) cout << pg << " ";
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cout << "\nFrame Count: " << fC << endl;
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cout << "Total Page Faults: " << totlPgF << "\n" << endl;
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}
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int main(int argc, char *argv[]) {
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if (argc < 2) {
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cerr << "Usage: " << argv[0]
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<< " <referenceString1.txt> <referenceString2.txt> <referenceString3.txt> "
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<< "<referenceString4.txt> <referenceString5.txt> <referenceString6.txt> "
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<< "<referenceString7.txt> <referenceString8.txt> <referenceString9.txt> "
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<< "<referenceString10.txt>" << endl;
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return 1;
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}
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for (int i = 1; i < argc; ++i) {
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pTC(argv[i]);
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}
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return 0;
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}

‎Part2/Code/lfu.cpp‎

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#include <iostream>
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#include <fstream>
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#include <vector>
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#include <unordered_map>
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#include <sstream>
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#include <algorithm>
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#include <string>
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using namespace std;
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// Implementation of the function to find least frequency
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int findLFU(const vector<int>& fam, const unordered_map<int, int>& fqncy) {
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int lfu_pg = fam[0]; //lfu_page as lfupg
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int min_fqncy = fqncy.at(lfu_pg);
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for (int pg : fam) {
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if (fqncy.at(pg) < min_fqncy) {
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lfu_pg = pg;
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min_fqncy = fqncy.at(pg);
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}
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}
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return lfu_pg;
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}
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// LFU Page Replacement Algorithm
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int lfuPageReplacement(const vector<int>& rStr, int fC) {
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vector<int> fam; // To store current frames
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unordered_map<int, int> fqncy; // To store frequency of pages
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int pgF = 0;
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for (int pg : rStr) {
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fqncy[pg]++;
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if (find(fam.begin(), fam.end(), pg) != fam.end()) {
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continue; // No page fault
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}
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pgF++;
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if (fam.size() < fC) {
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fam.push_back(pg);
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} else {
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int lfu_pg = findLFU(fam, fqncy);
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auto it = find(fam.begin(), fam.end(), lfu_pg);
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if (it != fam.end()) {
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fam.erase(it); // Remove LFU page
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}
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fam.push_back(pg); // Add new page
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}
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}
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return pgF;
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}
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void pTC(const string& fileName) {
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ifstream inputFile(fileName);
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if (!inputFile.is_open()) {
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cerr << "Error opening file: " << fileName << endl;
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return;
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}
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string line, referenceStringLine, frameCountLine;
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vector<int> rStr;
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int fC = 0;
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while (getline(inputFile, line)) {
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if (line.find("Reference String:") != string::npos) {
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// Extract the reference string after "Reference String:"
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string refStr = line.substr(line.find(":") + 1);
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stringstream refStream(refStr);
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string pageStr;
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while (getline(refStream, pageStr, ',')) {
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rStr.push_back(stoi(pageStr)); // Parse pages
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}
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} else if (line.find("Frame Count:") != string::npos) {
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// Extract the frame count after "Frame Count:"
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string frameCountStr = line.substr(line.find(":") + 1);
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fC = stoi(frameCountStr); // Parse frame count
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}
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}
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inputFile.close();
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if (rStr.empty() || fC == 0) {
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cerr << "Invalid input format in file: " << fileName << endl;
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return;
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}
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int totlPgF = lfuPageReplacement(rStr, fC);
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cout << "File: " << fileName << endl;
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cout << "Reference String: ";
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for (int page : rStr) cout << page << " ";
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cout << "\nFrame Count: " << fC << endl;
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cout << "Total Page Faults: " << totlPgF << "\n" << endl;
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}
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int main(int argc, char* argv[]) {
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if (argc < 2) {
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cerr << "Usage: " << argv[0]
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<< " <referenceString1.txt> <referenceString2.txt> <referenceString3.txt> "
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<< "<referenceString4.txt> <referenceString5.txt> <referenceString6.txt> "
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<< "<referenceString7.txt> <referenceString8.txt> <referenceString9.txt> "
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<< "<referenceString10.txt>" << endl;
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return 1;
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}
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for (int i = 1; i < argc; ++i) {
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pTC(argv[i]);
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}
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return 0;
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}

‎Part2/Code/lru.cpp‎

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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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using namespace std;
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struct Page {
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int pgNum; //pageNumber as pgNum, referenceBit as refB, capacity as cap
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bool refB;
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Page(int pgNum) : pgNum(pgNum), refB(false) {}
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};
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// Implementation of LRU Approximation with Second Chance Page Replacement Algorithm
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int lruAproxSC(const vector<int>& pgs, int cap) {
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vector<Page> fams; // frames as fams, pageFaults as pgF, pointer as pntr
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int pgF = 0;
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int pntr = 0;
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for (int curntPg : pgs) {
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bool pgFnd = false; //pageFound as pgFnd
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for (auto &page : fams) {
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if (page.pgNum == curntPg) {
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page.refB = true; // if the Page is hit then Set the reference bit to 1
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pgFnd = true;
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break;
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}
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}
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if (!pgFnd) {
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pgF++;
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if (fams.size() < cap) {
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fams.push_back(Page(curntPg));
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} else {
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while (true) {
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if (!fams[pntr].refB) {
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// Incase reference bit is set to 0 then replace this page
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fams[pntr] = Page(curntPg);
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break;
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} else {
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// If reference bit is set to 1 the reset it to 0 and move the pointer
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fams[pntr].refB = false;
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pntr = (pntr + 1) % cap;
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}
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}
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}
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pntr = (pntr + 1) % cap;
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}
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}
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return pgF;
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}
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void pTC(const string& fileName) {
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ifstream file(fileName);
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if (!file.is_open()) {
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cerr << "Error: Could not open file " << fileName << endl;
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return;
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}
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string line;
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vector<int> rStr;
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int fC = 0;
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while (getline(file, line)) {
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if (line.find("Reference String:") != string::npos) {
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// Extract the reference string
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stringstream ss(line.substr(line.find(":") + 1));
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int page;
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while (ss >> page) {
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rStr.push_back(page);
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if (ss.peek() == ',') ss.ignore(); // Ignore commas
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}
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} else if (line.find("Frame Count:") != string::npos) {
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// Extract the frame count
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fC = stoi(line.substr(line.find(":") + 1));
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}
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}
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file.close();
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int totalPageFaults = lruAproxSC(rStr, fC);
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cout << "File: " << fileName << endl;
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cout << "Reference String: ";
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for (int page : rStr) cout << page << " ";
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cout << "\nFrame Count: " << fC << endl;
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cout << "Total Page Faults of LRU(Second Chance): " << totalPageFaults << "\n" << endl;
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}
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int main(int argc, char *argv[]) {
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if (argc < 2) {
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cerr << "Usage: " << argv[0]
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<< " <referenceString1.txt> <referenceString2.txt> <referenceString3.txt> "
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<< "<referenceString4.txt> <referenceString5.txt> <referenceString6.txt> "
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<< "<referenceString7.txt> <referenceString8.txt> <referenceString9.txt> "
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<< "<referenceString10.txt>" << endl;
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return 1;
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}
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for (int i = 1; i < argc; ++i) {
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pTC(argv[i]);
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}
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return 0;
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}

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