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Exercise 1

Perfile el siguiente programa usando gprof. ¿Hay alguna forma de decir cuánto del tiempo gastado en la rutina c se debe a llamadas recursivas?




      main()
      {
          int i, n=10;
          for (i=0; i<1000; i++) {
              c(n);
              a(n);
          }
      }
      c(n)
      int n;
      {
          if (n > 0) { 
              a(n-1); 
              c(n-1);
          }
      }
      a(n)
      int n;
      {
          c(n);
      }

Exercise 2

Perfile un código ingenieril (que haga uso intensivo de números de punto flotante) con la optimización completa activa y no activa. ¿Cómo cambia el perfil? ¿Puede explicar por qué?

Exercise 3

Escriba un programa para determinar la sobrecarga que representa invocar a getrusage y etime. Aparte del tiempo de procesador que consumen, ¿cómo altera el rendimiento de la aplicación, el hecho de invocar demasiado a menudo una llamada al sistema para cronometraje?

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