/proc/stat gelezen met interval van 10 seconden maar zelfde inhoud

[xeross]

Ik heb een script gemaakt dat /proc/stat uitleest en in variables plaatst did om de cpu usage the berekenen:

// read a file into memory
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  int user1, nice1, system1, idle1, user2, nice2, system2, idle2, usageperc;
  float usage;
  long double user, nice, system, idle;
  string nothingness;

  ifstream is, is2;
  is.open("/proc/stat");

  if (!is) {
    cout << "Can't open file";
    is.close();
    exit(1);
  }

  is >> nothingness >> user1 >> nice1 >> system1 >> idle1;
  is.close();

  sleep(10);

  is2.open("/proc/stat");
  is2 >> nothingness >> user2 >> nice2 >> system2 >> idle2;
  user = user2 - user1;
  nice = nice2 - nice1;
  system = system2 - system1;
  idle = idle2 - idle1;
  usage = (user + system) / (user + system + nice + idle);
  cout << "\nuser1" << user1 << "\nuser2" << user2;
  return 0;
}

maar user1 en user2 zijn hetzelfde, hoe kan dit ?

MVG, Xeross