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Risposte Compito di Sistemi Operativi, 5/06/2001


  1. b,d,f,h
  2. a,c,e,f,g
  3. a,f,g
  4. c,d,i
  5. d,g
  6.  
  7.  
  8. Politica Round Robin
 

P1
P4
P1 P3 P4 P2 P1 P5 P3 P2 P1 P5 P3 P5
4-10ms 10-16 16-22 22-28 28-29 29-35 35-41 41-47 47-53 53-54 54-56 56-62 62-64 64-65

                Tempo medio d'attesa: 147/5
                Turn Around medio: 208/5


  1.  
    1. ALGORITMO LRU

    2. Pagina Riferita

 

  4 12 3 2 1 5 3 4 9 1 2 5 9 5 1 2 10 12 3 9
0 4 4 4 4 4 5 5 5 5 5 2 2 2 2 2 2 2 2 2 2
1 12 12 12 12 12 12 4 4 4 4 4 4 4 4 4 10 10 10 10
2 3 3 3 3 3 3 3 3 3 5 5 5 5 5 5 5 3 3
3 2 2 2 2 2 9 9 9 9 9 9 9 9 9 12 12 12
4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 9
P P P P P P P P P P P P P P
                        5 + 9 = 14 page fault
 


  1. ALGORITMO SECOND CHANCE

  2. TurnoMS

 

  4 12 3 2 1 5 3 4 9 1 2 5 9 5 1 2 10 12 3 9
0 41 41 41 41 41 51 51 51 51 51 50 51 51 51 51 51 50 50 50 91
1 121 121 121 121 120 120 41 41 41 40 40 40 40 40 40 101 101 101 101
2 31 31 31 30 31 31 30 30 21 21 21 21 21 21 21 20 20 20
3 21 21 20 20 20 91 91 91 91 91 91 91 91 90 121 121 121
4 11 10 10 10 10 11 10 10 10 10 11 11 10 10 31 31
P P P P P P P P P P P P P
                        5 + 8 = 13 page fault
     

Topic revision: r1 - 2001-12-27 - AntonioValletta






 
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