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Risposte Compito di Sistemi Operativi, 30/01/2001


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

P1
P3
P1 P4 P3 P2 P1 P5 P4 P2 P1 P5 P4 P5
3-9ms 9-15 15-21 21-27 27-29 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: 209/5

  1.  
    1. ALGORITMO LRU

    2. Pagina Riferita

 

  1 12 3 2 0 10 12 3 9 0 5 2 1 3 9 5 0 9 0 2
0 1 1 1 1 1 10 10 10 10 10 5 5 5 5 5 5 5 5 5 5
1 12 12 12 12 12 12 12 12 12 12 2 2 2 2 2 0 0 0 0
2 3 3 3 3 3 3 3 3 3 3 1 1 1 1 1 1 1 2
3 2 2 2 2 2 9 9 9 9 9 3 3 3 3 3 3 3
4 0 0 0 0 0 0 0 0 0 0 9 9 9 9 9 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

 

  1 12 3 2 0 10 12 3 9 0 5 2 1 3 9 5 0 9 0 2
0 11 11 11 11 11 101 101 101 101 101 100 100 100 31 31 31 30 30 30 30
1 121 121 121 121 120 121 121 120 51 51 51 51 51 51 01 01 01 01 01
2 31 31 31 30 30 31 30 30 30 21 21 21 21 21 20 20 20 21
3 21 21 20 20 20 91 91 91 91 90 90 91 91 90 91 91 91
4 01 00 00 00 00 01 00 00 11 11 11 11 10 10 10 10
P P P P P P P P P P P P
                        5 + 7 = 12 page fault
     

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






 
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