It consists of CPU scheduling algorithms, examples, scheduling problems, realtime scheduling algorithms and issues. Multiprocessing and multicore scheduling.
It consists of CPU scheduling algorithms, examples, scheduling problems, realtime scheduling algorithms and issues. Multiprocessing and multicore scheduling.
Hello....
Dear views
Scheduling is most important Role in OS..... in this ppt i described very Creatively about Process Scheduling...... I hope you like it..... and easily understand it...... :-) :-)
About real time system task scheduling basic concepts.It deals with task, instance,data sharing and their types.It also covers various important terminologies regarding scheduling algorithms.
Gives an overview about Process, PCB, Process States, Process Operations, Scheduling, Schedulers, Interprocess communication, shared memory and message passing systems
Operating Systems Process Scheduling Algorithmssathish sak
CPU scheduling big area of research in early ‘70s
Many implicit assumptions for CPU scheduling:
One program per user
One thread per program
Programs are independent
These are unrealistic but simplify the problem
Does “fair” mean fairness among users or programs?
If I run one compilation job and you run five, do you get five times as much CPU?
Often times, yes!
Goal: dole out CPU time to optimize some desired parameters of the system.
Hello....
Dear views
Scheduling is most important Role in OS..... in this ppt i described very Creatively about Process Scheduling...... I hope you like it..... and easily understand it...... :-) :-)
About real time system task scheduling basic concepts.It deals with task, instance,data sharing and their types.It also covers various important terminologies regarding scheduling algorithms.
Gives an overview about Process, PCB, Process States, Process Operations, Scheduling, Schedulers, Interprocess communication, shared memory and message passing systems
Operating Systems Process Scheduling Algorithmssathish sak
CPU scheduling big area of research in early ‘70s
Many implicit assumptions for CPU scheduling:
One program per user
One thread per program
Programs are independent
These are unrealistic but simplify the problem
Does “fair” mean fairness among users or programs?
If I run one compilation job and you run five, do you get five times as much CPU?
Often times, yes!
Goal: dole out CPU time to optimize some desired parameters of the system.
CPU Scheduling: Dispatcher, CPU scheduling is a process which allows one process to use the CPU while the execution of another process is on hold(in waiting state) due to unavailability of any resource like I/O etc., thereby making full use of CPU. The aim of CPU scheduling is to make the system efficient, fast and fair.
The dispatcher is the module that gives control of the CPU to the process selected by the
short-term scheduler.
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Srt algorithm
1.
2. Shortest Remaining Time (SRT)
Is the preemptive version of the SJN (Shortest
Job Next) algorithm. The processor is allocated
to the job closest to completion --- but even this
job can be preempted if the newer job in the
READY queue has a time to completion that’s
shorter.
3. This algorithm can be implemented in an interactive
system because it requires advance knowledge of
the CPU time required to finish each job. It is often
used in batch environments, when it is desirable to
give preference to short job; even though SRT
involves more overhead than SJN because the
operating system has to frequently monitor the CPU
time for all the jobs being swapped (switched) at
preemption time (not necessarily swapped out to the
disk although this might occur as well).
4. Example:
The example in Figure 1 shows how the SRT algorithm
works in four jobs that arrived in quick succession (one
CPU cycle part).
5. Figure 1. timeline for job sequence A, B,C,D using the preemptive SRT
algorithm. Each job is interrupted after one CPU cycle if another job is
waiting with less CPU time remaining
6. In this case, the turn around time is the completion time of each job
minus its arrival time:
Job A B C D
Turnaround 14 4 1 6
14+4+1+6
So the average turnaround time is:
4 = 6.25
