chapter9

lottery.py参数

第一题

问题

计算 3 个工作在随机种子为 1、2 和 3 时的模拟解。

输出太长了，不截图了，直接把结果复制了。

随机种子为1时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -j 3 -s 1 -c
ARG jlist 
ARG jobs 3
ARG maxlen 10
ARG maxticket 100
ARG quantum 1
ARG seed 1

Here is the job list, with the run time of each job: 
  Job 0 ( length = 1, tickets = 84 )
  Job 1 ( length = 7, tickets = 25 )
  Job 2 ( length = 4, tickets = 44 )


** Solutions **

Random 651593 -> Winning ticket 119 (of 153) -> Run 2
  Jobs:
 (  job:0 timeleft:1 tix:84 )  (  job:1 timeleft:7 tix:25 )  (* job:2 timeleft:4 tix:44 ) 
Random 788724 -> Winning ticket 9 (of 153) -> Run 0
  Jobs:
 (* job:0 timeleft:1 tix:84 )  (  job:1 timeleft:7 tix:25 )  (  job:2 timeleft:3 tix:44 ) 
--> JOB 0 DONE at time 2
Random 93859 -> Winning ticket 19 (of 69) -> Run 1
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (* job:1 timeleft:7 tix:25 )  (  job:2 timeleft:3 tix:44 ) 
Random 28347 -> Winning ticket 57 (of 69) -> Run 2
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (  job:1 timeleft:6 tix:25 )  (* job:2 timeleft:3 tix:44 ) 
Random 835765 -> Winning ticket 37 (of 69) -> Run 2
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (  job:1 timeleft:6 tix:25 )  (* job:2 timeleft:2 tix:44 ) 
Random 432767 -> Winning ticket 68 (of 69) -> Run 2
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (  job:1 timeleft:6 tix:25 )  (* job:2 timeleft:1 tix:44 ) 
--> JOB 2 DONE at time 6
Random 762280 -> Winning ticket 5 (of 25) -> Run 1
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (* job:1 timeleft:6 tix:25 )  (  job:2 timeleft:0 tix:--- ) 
Random 2106 -> Winning ticket 6 (of 25) -> Run 1
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (* job:1 timeleft:5 tix:25 )  (  job:2 timeleft:0 tix:--- ) 
Random 445387 -> Winning ticket 12 (of 25) -> Run 1
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (* job:1 timeleft:4 tix:25 )  (  job:2 timeleft:0 tix:--- ) 
Random 721540 -> Winning ticket 15 (of 25) -> Run 1
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (* job:1 timeleft:3 tix:25 )  (  job:2 timeleft:0 tix:--- ) 
Random 228762 -> Winning ticket 12 (of 25) -> Run 1
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (* job:1 timeleft:2 tix:25 )  (  job:2 timeleft:0 tix:--- ) 
Random 945271 -> Winning ticket 21 (of 25) -> Run 1
  Jobs:
 (  job:0 timeleft:0 tix:--- )  (* job:1 timeleft:1 tix:25 )  (  job:2 timeleft:0 tix:--- ) 
--> JOB 1 DONE at time 12

随机种子分别为2，3时的输出就不给出了，只给出相关命令：

随机种子为2时：

python lottery.py -j 3 -s 2 -c

随机种子为3时：

python lottery.py -j 3 -s 3 -c

第二题

问题

现在运行两个具体的工作：每个长度为 10，但是一个（工作 0）只有一张彩票，另一个（工作 1）有 100 张（−l 10∶1,10∶100）。彩票数量如此不平衡时会发生什么？在工作 1 完成之前，工作 0 是否会运行？多久？一般来说，这种彩票不平衡对彩票调度的行为有什么影响？

输出太长了，不截图了，直接把结果复制了。

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 10:1,10:100 -c
ARG jlist 10:1,10:100
ARG jobs 3
ARG maxlen 10
ARG maxticket 100
ARG quantum 1
ARG seed 0

Here is the job list, with the run time of each job: 
  Job 0 ( length = 10, tickets = 1 )
  Job 1 ( length = 10, tickets = 100 )


** Solutions **

Random 844422 -> Winning ticket 62 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:10 tix:100 ) 
Random 757955 -> Winning ticket 51 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:9 tix:100 ) 
Random 420572 -> Winning ticket 8 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:8 tix:100 ) 
Random 258917 -> Winning ticket 54 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:7 tix:100 ) 
Random 511275 -> Winning ticket 13 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:6 tix:100 ) 
Random 404934 -> Winning ticket 25 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:5 tix:100 ) 
Random 783799 -> Winning ticket 39 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:4 tix:100 ) 
Random 303313 -> Winning ticket 10 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:3 tix:100 ) 
Random 476597 -> Winning ticket 79 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:2 tix:100 ) 
Random 583382 -> Winning ticket 6 (of 101) -> Run 1
  Jobs:
 (  job:0 timeleft:10 tix:1 )  (* job:1 timeleft:1 tix:100 ) 
--> JOB 1 DONE at time 10
Random 908113 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:10 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 504687 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:9 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 281838 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:8 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 755804 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:7 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 618369 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:6 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 250506 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:5 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 909747 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:4 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 982786 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:3 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 810218 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:2 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
Random 902166 -> Winning ticket 0 (of 1) -> Run 0
  Jobs:
 (* job:0 timeleft:1 tix:1 )  (  job:1 timeleft:0 tix:--- ) 
--> JOB 0 DONE at time 20

在工作1完成之前，工作0基本没有机会运行。这种不平衡会造成进程饥饿现象。

第三题

问题

如果运行两个长度为 100 的工作，都有 100 张彩票（−l100∶100,100∶100），调度程序有多不公平？运行一些不同的随机种子来确定（概率上的）答案。不公平性取决于一项工作比另一项工作早完成多少。

输出太长，给出命令和工作结束时间：

随机种子为1时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 1 -c

--> JOB 1 DONE at time 196

--> JOB 0 DONE at time 200

随机种子为2时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 2 -c

--> JOB 1 DONE at time 190

--> JOB 0 DONE at time 200

随机种子为3时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 3 -c

--> JOB 0 DONE at time 196

--> JOB 1 DONE at time 200

随机种子为4时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 4 -c

--> JOB 1 DONE at time 199

--> JOB 0 DONE at time 200

随机种子为5时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 5 -c

--> JOB 1 DONE at time 181

--> JOB 0 DONE at time 200

所以还是蛮公平的

第四题

问题

随着量子规模（-q）变大，你对上一个问题的答案如何改变？

输出太长，给出命令和工作结束时间：

随机种子为1，量子规模为10时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 1 -q 10 -c

--> JOB 1 DONE at time 160

--> JOB 0 DONE at time 200

随机种子为2, 量子规模为10时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 2 -q 10 -c

--> JOB 1 DONE at time 190

--> JOB 0 DONE at time 200

随机种子为3，量子规模为10时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 3 -q 10 -c

--> JOB 0 DONE at time 190

--> JOB 1 DONE at time 200

随机种子为4，量子规模为10时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 4 -q 10 -c

--> JOB 1 DONE at time 190

--> JOB 0 DONE at time 200

随机种子5，量子规模为10时：

[whq@whq01 cpu-sched-lottery]$ python lottery.py -l 100:100,100:100 -s 5 -q 10 -c

--> JOB 1 DONE at time 160

--> JOB 0 DONE at time 200

由于量子规模变大，相当于工作长度缩短了，因此进程的不公平性增加。

书上也给出了相关说明：

第五题

问题

你可以制作类似本章中的图表吗？

还有什么值得探讨的？用步长调度程序，图表看起来如何？

用步长调度程序制作图表，如果选取调度周期作为采样时间点，那么图表会是精确的完全公平直线。如果同时选用非调度周期作为时间点，那么在直线附近会有一些起伏，且起伏程度越来越小。