memory.cpp

#include <unistd.h>
#include <ios>
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

void mem_usage(double& vm_usage, double& resident_set) 
{
    vm_usage = 0.0;
    resident_set = 0.0;
    ifstream stat_stream("/proc/self/stat", ios_base::in);

    string pid, comm, state, ppid, pgrp, session, tty_nr;
    string tpgid, flags, minflt, cminflt, majflt, cmajflt;
    string utime, stime, cutime, cstime, priority, nice;
    string O, itrealvalue, starttime;
    unsigned long vsize;
    long rss;

    stat_stream >> pid >> comm >> state >> ppid >> pgrp >> session >> tty_nr >>
        tpgid >> flags >> minflt >> cminflt >> majflt >> cmajflt >> utime >>
        stime >> cutime >> cstime >> priority >> nice >> O >> itrealvalue >> 
        starttime >> vsize >> rss;
    stat_stream.close();
    long page_size_kb = sysconf(_SC_PAGE_SIZE) / 1024;
    vm_usage = vsize / 1024.0;
    resident_set = rss * page_size_kb;
}

int main() 
{
    double vm, rss;
    mem_usage(vm, rss);
    cout << "Virtual Memory: " << vm << "\nResident set size: " << rss << endl;
}