Java program to find CPU load using 'mpstat'

The following java program uses the linux command 'mpstat' to determine the CPU load .

To see the client-server version of the program with multiple clients, see here .


public class CpuLoad {
    public static void main(String args[]) {
      int i=1;
      float finalres;
      try{
        // execute the linux command
        Process p=Runtime.getRuntime().exec("mpstat");
        BufferedReader in=new BufferedReader(new   InputStreamReader(p.getInputStream()));
        String line=null;
        //read the row corresponding to cpu idle
        while((line=in.readLine())!=null && i<4){        
          i++;
        }      
        String res=line.substring(line.length()-5);
        finalres=Float.parseFloat(res);
        //convert the idle to cpuload
        System.out.println("CPU load:"+(100-finalres)+"%");
      }
      catch(Exception e){
        System.out.println(e);
      }
  }
}