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Risposte Compito di Sistemi Operativi, 16/01/2001


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

P1
P4
P1 P3 P4 P2 P1 P5 P3 P2 P1 P5 P3 P5
0-6ms 6-12 12-18 18-24 24-26 26-32 32-38 38-44 44-50 50-51 51-53 53-59 59-60 60-61
                Tempo medio d'attesa: 146/5
                Turn Around medio: 207/5=36

  1.  
    1. ALGORITMO LRU

    2. Pagina Riferita

 

  10 11 6 9 12 3 6 11 10 12 3 9 0 5 2 1 3 9 5 0
0 10 10 10 10 10 3 3 3 3 3 3 3 3 3 3 1 1 1 1 1
1 11 11 11 11 11 11 11 11 11 11 11 0 0 0 0 0 9 9 9
2 6 6 6 6 6 6 6 6 6 9 9 9 9 9 3 3 3 3
3 9 9 9 9 9 10 10 10 10 10 5 5 5 5 5 5 5
4 12 12 12 12 12 12 12 12 12 12 2 2 2 2 2 0
P P P P P P P P P P P P P P P
                        5 + 10 = 15 page fault
 


  1. ALGORITMO SECOND CHANCE

 

  10 11 6 9 12 3 6 11 10 12 3 9 0 5 2 1 3 9 5 0
0 101 101 101 101 101 31 31 31 30 30 31 30 30 30 21 20 20 20 20 01
1 111 111 111 111 110 110 111 110 110 110 91 90 90 90 90 31 30 30 30
2 61 61 61 60 61 61 60 60 60 60 01 00 00 00 00 91 91 90
3 91 91 90 90 90 101 101 101 100 100 100 100 11 10 10 10 10
4 121 120 120 120 120 121 121 120 120 51 50 50 50 50 51 50
P P P P P P P P P P P P P P P
                        5 + 10 = 15 page fault
     

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






 
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