2. INTRODUCTION
Scheduling:-
Scheduling is key concept in
computer multitasking, multiprocessing
operating system and real time operating system
.
CPU Scheduling:-
CPU scheduling is a
multiprogramming operating system allows more
than one process then one process to be loaded
into the executable memory at a time and for the
loaded process to share the CPU using time
multiplexing.
3. PROCESS SCHEDULER
Long-term scheduler:-
It selects the process from the job pool and loads
into the memory for execution.
Short-term scheduler:-
Ready to execute and allocates the CPU to one of
them.
Medium-term scheduler:
Time sharing , remove processes from memory
and thus reduce degree of multiprogramming.
4. SCHEDULING ALGORITHMS
• Non-Preemptive:-
Put the process at the head of the ready
queue and execute the process for the
completion
• Preemptive: -
Preempt the process if the priority of the
newly arrived process is higher than the
priority of the currently running process and
execute the first newly running process .
6. FCFS
First Come First Served (FCFS):-
• FCFS is the non-preemptive in nature will have
negligible amount of context switching as a
process.
• The execution of the FCFS algorithm is easily
managed with a FIFO queue.
7. SJF
Shortest Job First (SJF):-
This algorithm associates with each the length of
the process next CPU burst.
Shortest job first scheduling algorithm is used for
minimizing response time (Response time is the
from the submission of a request until the first is
produced).
8. RRS
Round Robin Scheduling (RRS):-
One of the oldest, simplest, fairest and widely
used algorithms is Round Robin.
RRS algorithm is designed especially for time
sharing system (sharing computing resources
among many users by means of
multiprogramming and multitasking).
9. CONCLUSION
• Conclusion is all process to be suggested the
algorithm needed to increment process OS
system and scheduling. SJF scheduling tends
to result in increased waiting time for long
processes.
