scheduling selective
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8/2/2019 Scheduling Selective
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7
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
8/2/2019 Scheduling Selective
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8
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 3/78
9
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
Arrival Times of the Jobs
8/2/2019 Scheduling Selective
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10
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 5/78
11
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 6/78
12
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 7/78
13
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 8/78
14
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 9/78
15
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 10/78
16
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 11/78
17
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 12/78
18
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 13/78
19
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 14/78
20
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 15/78
21
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 16/78
22
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3 0
2 2 6 1
3 4 4 5
4 6 5 7
5 8 2 10
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 17/78
23
First-Come, First-Served (FIFO) Start jobs in the order they arrive (FIFO queue) Run each job until completion
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3 0 3
2 2 6 1 7
3 4 4 5 9
4 6 5 7 12
5 8 2 10 12
Total time taken,from submission to
completion
8/2/2019 Scheduling Selective
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24
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
8/2/2019 Scheduling Selective
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25
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Same Job Mix
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 20/78
26
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 21/78
27
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
8/2/2019 Scheduling Selective
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Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 23/78
29
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 24/78
30
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 25/78
31
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
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32
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 27/78
33
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 28/78
34
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 29/78
35
Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 30/78
36
Shortest Job First
Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 31/78
37
Shortest Job First
Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 32/78
38
Shortest Job First
Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3 0
2 2 6 1
3 4 4 7
4 6 5 95 8 2 1
8/2/2019 Scheduling Selective
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39
Shortest Job First
Select the job with the shortest (expected) running time Non-Preemptive
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3 0 3
2 2 6 1 7
3 4 4 7 11
4 6 5 9 145 8 2 1 3
8/2/2019 Scheduling Selective
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40
Shortest Remaining Time
Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
Same Job Mix
8/2/2019 Scheduling Selective
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41
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
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42
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 37/78
43
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 38/78
44
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
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45
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 40/78
46
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 41/78
47
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 42/78
48
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 43/78
49
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 44/78
50
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 45/78
51
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 46/78
52
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 47/78
53
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3
2 2 6
3 4 4
4 6 55 8 2
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 48/78
54
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3 0
2 2 6 7
3 4 4 0
4 6 5 95 8 2 0
8/2/2019 Scheduling Selective
http://slidepdf.com/reader/full/scheduling-selective 49/78
55
Shortest Remaining Time
• Preemptive version of SJF
0 5 10 15 20
Arrival Processing Turnaround Process Time Time Delay Time
1 0 3 0 3
2 2 6 7 13
3 4 4 0 4
4 6 5 9 145 8 2 0 2
8/2/2019 Scheduling Selective
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Round-Robin Scheduling
Goal: Enable interactivity Limit the amount of CPU that a process can have at
one time.
Time quantum Amount of time the OS gives a process beforeintervention The “time slice” Typically: 1 to 100ms
8/2/2019 Scheduling Selective
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
8/2/2019 Scheduling Selective
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60
Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
d b h d l
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
R d R bi S h d li
8/2/2019 Scheduling Selective
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
R d R bi S h d li
8/2/2019 Scheduling Selective
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
R d R bi S h d li
8/2/2019 Scheduling Selective
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Ready List:
Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
R d R bi S h d li
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round Robin Scheduling
8/2/2019 Scheduling Selective
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round Robin Scheduling
8/2/2019 Scheduling Selective
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round Robin Scheduling
8/2/2019 Scheduling Selective
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round Robin Scheduling
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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Round-Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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Round Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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Round Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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Round Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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Round Robin Scheduling
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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ound ob n Schedul ng
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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g
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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g
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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g
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0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 44 6 5
5 8 2
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Round-Robin Scheduling
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g
•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 44 6 5
5 8 2
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Round-Robin Scheduling
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•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 44 6 5
5 8 2
Ready List:
Round-Robin Scheduling
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•
0 5 10 15 20
Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 44 6 5
5 8 2
Round-Robin Scheduling
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•
0 5 10 15 20
Arrival Processing Turnaround
Process Time Time Delay Time
1 0 3 1 4
2 2 6 10 16
3 4 4 9 134 6 5 9 14
5 8 2 5 7
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