linux 0.11 修改时间片大小后的表现

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2023/07/13/The-performance-of-linux-0.11-after-modifying-the-time-slice-size

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Linux

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new update day

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Oct 22, 2023 01:31 PM

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Last edited time

Oct 22, 2023 01:31 PM


(Unit: tick)
Process   Turnaround   Waiting   CPU Burst   I/O Burst
      0            0         0           0           0
      1         7871         1           0        7870
      2           20        19           0           0
      3         3011        10           0        3000
      4         7922       180           0        7742
      5            4         3           0           0
      6         2300       190           0        2110
      7         2298        98           0        2200
      8         3852      1887           0        1965
      9         5242      3481           0        1760
     10         5312      4881           0         431
     11            0         0           0           0
     12            1         0           0           0
     13            0         0           0           0
     14            0         0           0           0
     15            1         0           0           0
     16            0         0           0           0
     17           73        73           0           0
     18           15        15           0           0
     19            4         3           0           0
     20            1         0           0           0
Average:     1806.05    516.24
Throughout: 0.26/s


(Unit: tick)
Process   Turnaround   Waiting   CPU Burst   I/O Burst
      0            0         0           0           0
      1         5799         2           0        5797
      2           25        24           0           0
      3         3008         4           0        3003
      4         6375       170           0        6204
      5            3         3           0           0
      6         2251        10           0        2240
      7         2248       143           0        2105
      8         3789      1887           0        1901
      9         4404      3448           0         955
     10            0         0           0           0
     11            1         0           0           0
     12            1         0           0           0
     13            0         0           0           0
     14            1         0           0           0
     15            1         0           0           0
     16            0         0           0           0
     17            4         3           0           0
     18            5         5           0           0
     19            3         3           0           0
     20            1         0           0           0
Average:     1329.48    271.52
Throughout: 0.33/s


(Unit: tick)
Process   Turnaround   Waiting   CPU Burst   I/O Burst
      0            0         0           0           0
      1         6264         7           0        6257
      2           20        19           0           0
      3         3024        10           0        3013
      4         7269       220           0        7049
      5            4         3           0           0
      6         2590        10           0        2580
      7         2588       187           0        2400
      8         4112      1967           0        2145
      9         5183      3551           0        1631
     10         5162      4940           0         221
     11            0         0           0           0
     12            1         0           0           0
     13            1         0           0           0
     14            0         0           0           0
     15            1         0           0           0
     16            0         0           0           0
     17           23        22           0           0
     18           25        25           0           0
     19            4         3           0           0
     20            1         0           0           0
Average:     1727.24    522.10
Throughout: 0.29/s


(Unit: tick)
Process   Turnaround   Waiting   CPU Burst   I/O Burst
      0            0         0           0           0
      1         6788         7           0        6781
      2           20        19           0           0
      3         3033        10           0        3022
      4         7413       274           0        7139
      5            4         3           0           0
      6         2736        10           0        2725
      7         2733       233           0        2500
      8         4172      2008           0        2164
      9         4797      3586           0        1210
     10            0         0           0           0
     11            1         0           0           0
     12            1         0           0           0
     13            0         0           0           0
     14            1         0           0           0
     15            1         0           0           0
     16            0         0           0           0
     17           78        78           0           0
     18          130       130           0           0
     19            4         3           0           0
     20            1         0           0           0
Average:     1519.67    302.90
Throughout: 0.28/s

时间片变小，进程因时间片到时产生的进程调度次数变多，该进程等待时间越长。

然而随着时间片增大，进程因中断或者睡眠进入的进程调度次数也增多，等待时间随之变长。

故而需要设置合理的时间片，既不能过大，也不能过小。

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