Introduction Job Scheduling Versus Process Scheduling Process Scheduler Process Identification Process Status Process State Accounting Process Scheduling Policies Process Scheduling Algorithms Cache Memory Interrupts. Job Scheduling Process Scheduling Interrupt Management.
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Maximize CPU efficiency by keeping CPU busy 100 % of time.
Ensure fairness for all jobs by giving everyone an equal amount of CPU and I/O time.
Minimize response time by quickly turning around interactive requests.
Minimize turnaround time by moving entire jobs in/out of system quickly.
Minimize waiting time by moving jobs out of READY queue as quickly as possible.A Good Scheduling Policy
Process CPU Burst (Turnaround Time)
A 15 milliseconds
B 2 milliseconds
C 1 millisecond
What does the time line look like?
What’s the average turnaround time?
first come first served
multiple level queues
non-preemptive scheduling policyKey Terms
Process Control Block
process scheduling algorithm
process scheduling policyprocess status
shortest job next (SJN)
shortest remaining time
turnaround timeKey Terms - 2