Process Scheduling

Operating System: Process Scheduling
Topics discussed:
Process Scheduling
1) Objectives of multiprogramming and time-sharing.
2) Process Scheduler.
3) Scheduling Queues.
4) Job Queue.
5) Ready Queue.

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[quratraja]

Thank You.
So process scheduling is ond of the important service of operating system. Job Queue contains all the process while ready Queue contains those that are ready for execution and waiting for CPU to be assigned. When a process is taken by processor and has started execution, it can either end, swap, or go to wait for I/O. Swapped processes and those waiting for I/O's have their own respective queues.

[hoangminhchau]

Multiprogramming: multiple processes running at all time, to maximize CPU utilization
Time sharing: switching CPU between processes happens so frequently that user can interact with programs while running
A process scheduler will select an available process (from a list of ready processes) to be executed

There are 2 queues:
- Job queue: when a process enters the system, it will be pushed to this queue. So this queue represents all the processes of the system
- Ready queue: all the processes waiting in the memory to be assigned a CPU to execute

When a process is assigned a CPU, and then another higher priority process come, it will be swapped out, and pushed to the parially executed processes queue, and then swapped in back to the ready queue.

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[Jay-ljbv]

The ready queue is a queue of all processes that are waiting to be scheduled on a core/CPU.
The job queue is the list of processes that reside on mass storage/secondary storage and await main memory allocation.

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