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ALL > Computer and Education > courses > university courses > undergraduate courses > Operating System > ZSTU-(2020-2021)-1 > student homework > >
hw_12 Version 0
👤 Author: by hokyeejaufoxmailcom 2021-01-07 01:24:38

  • Work Queue: 23, 89, 132, 42, 187

  • there are 200 cylinders numbered from 0 - 199

  • the diskhead stars at number 100



  1. FCFS 
     total time is estimated by total arm motion

  2. SSTF 

  3. SCAN

    • assume we are going inwards (i.e., towards 0)





  4. LOOK



    • reduce variance compared to SCAN



  5. C-SCAN


  6. C-LOOK


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