scheduling selective
TRANSCRIPT
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Shortest Job First Select the job with the shortest (expected) running time Non-Preemptive
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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
Same Job Mix
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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
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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
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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
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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
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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 55 8 2
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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 55 8 2
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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 55 8 2
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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 55 8 2
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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 55 8 2
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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 55 8 2
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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 55 8 2
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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 55 8 2
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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 0
2 2 6 1
3 4 4 7
4 6 5 95 8 2 1
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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 0 3
2 2 6 1 7
3 4 4 7 11
4 6 5 9 145 8 2 1 3
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Round-Robin Scheduling
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0 5 10 15 20
Arrival Processing
Process Time Time
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3 4 4
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5 8 2
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Round-Robin Scheduling
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Arrival Processing
Process Time Time
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3 4 4
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5 8 2
Ready List:
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Round-Robin Scheduling
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Arrival Processing
Process Time Time
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5 8 2
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Round-Robin Scheduling
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Arrival Processing
Process Time Time
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3 4 4
4 6 5
5 8 2
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Round-Robin Scheduling
•
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Arrival Processing
Process Time Time
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3 4 4
4 6 5
5 8 2
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d b h d l
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Round-Robin Scheduling
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Process Time Time
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5 8 2
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R d R bi S h d li
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Round-Robin Scheduling
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Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
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R d R bi S h d li
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Round-Robin Scheduling
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Arrival Processing
Process Time Time
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3 4 4
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5 8 2
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R d R bi S h d li
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Ready List:
Round-Robin Scheduling
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0 5 10 15 20
Arrival Processing
Process Time Time
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3 4 4
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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
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Round-Robin Scheduling
•
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Arrival Processing
Process Time Time
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2 2 6
3 4 4
4 6 5
5 8 2
Ready List:
Round Robin Scheduling
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Round-Robin Scheduling
•
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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
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Arrival Processing
Process Time Time
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3 4 4
4 6 5
5 8 2
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Round Robin Scheduling
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Round-Robin Scheduling
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Process Time Time
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4 6 5
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Round-Robin Scheduling
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Round-Robin Scheduling
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Process Time Time
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Round-Robin Scheduling
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Round Robin Scheduling
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Process Time Time
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Round Robin Scheduling
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Arrival Processing
Process Time Time
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3 4 4
4 6 5
5 8 2
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Round Robin Scheduling
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Process Time Time
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4 6 5
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Round Robin Scheduling
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Arrival Processing
Process Time Time
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3 4 4
4 6 5
5 8 2
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ound ob n Schedul ng
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Arrival Processing
Process Time Time
1 0 3
2 2 6
3 4 4
4 6 5
5 8 2
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g
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Arrival Processing
Process Time Time
1 0 3
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3 4 4
4 6 5
5 8 2
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Arrival Processing
Process Time Time
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3 4 4
4 6 5
5 8 2
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Process Time Time
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5 8 2
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Process Time Time
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5 8 2
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Arrival Processing
Process Time Time
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3 4 44 6 5
5 8 2
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Arrival Processing
Process Time Time
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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