process scheduling

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process scheduling

Process Control Blocks(PCB)

Job 5 States

FINISHED

RUNNING

WAITING

READY

HOLD

Types of Scheduling

JOB SCHEDULING

Goal

keep most system components busy most of time

balance I/O interaction and computation

sequence jobs

functions

decides on job initiation criteria

places jobs in process queue

selects incoming job from queue

process sheduling based on certain criteria

determines execution steps

process scheduling responsibilities

lower-level scheduler

PROCESS SCHEDULING

function

recognizes job conclusion

determines which queues for job movement during execution

decides when to interrupt processing

determines which ob will get CPU resource

job initiation based on certain criteria

job scheduling responsibilities

first encounter for job/program

higher-level scheduler