CS 140 Lecture Notes: Protection

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Presentation transcript:

CS 140 Lecture Notes: Protection Scenario #1 Ready Queue C 2ms B 1ms A 100ms FCFS A B C Avg: 101.3 time 100 101 103 Round Robin A B C A C A Avg: 36.7 time 2 5 103 CS 140 Lecture Notes: Protection

CS 140 Lecture Notes: Protection Scenario #2 Ready Queue C 10ms B 10ms A 10ms FCFS A B C Avg: 20 time 10 20 30 Round Robin ... A B C A B C A B C A B C Avg: 29 time 28 29 30 CS 140 Lecture Notes: Protection

Scenario #1 Ready Queue A B C A B C A C A B C A C 2ms B 1ms A 100ms FCFS A B C Avg: 101.3 time 100 101 103 Round Robin A B C A C A Avg: 36.7 time 2 5 103 STCF B C A Avg: 35.7 1 3 103

... Scenario #2 Ready Queue A B C A B C A B C A B C A B C A B C C 10ms B 10ms A 10ms FCFS A B C Avg: 20 time 10 20 30 Round Robin ... A B C A B C A B C A B C Avg: 29 time 28 29 30 STCF A B C Avg: 20 time 10 20 30