OSi protsessi ressursijaotus

http://www.tutorialspoint.com/operating_system/os_process_scheduling.htm

Saalimine:
Medium Term Scheduler

Comparison between Scheduler

S.N. Long Term Scheduler Short Term Scheduler Medium Term Scheduler
1 It is a job scheduler It is a CPU scheduler It is a process swapping scheduler.
2 Speed is lesser than short term scheduler Speed is fastest among other two Speed is in between both short and long term scheduler.
3 It controls the degree of multiprogramming It provides lesser control over degree of multiprogramming It reduces the degree of multiprogramming.
4 It is almost absent or minimal in time sharing system It is also minimal in time sharing system It is a part of Time sharing systems.
5 It selects processes from pool and loads them into memory for execution It selects those processes which are ready to execute It can re-introduce the process into memory and execution can be continued.

Context Switch

FCFS:

First Come First Serve Scheduling Algorithm

SJF:

Shortest Job First Scheduling Algorithm

PBS:

Priority Scheduling Algorithm

RRS:

Round Robin Scheduling Algorithm

MQS:

Multi Queue Scheduling Algorithm

Lõim:

Single vs Multithreaded Process

Lõime on lihtsam luua ja lihtsam hallata kui protsesse.

Mitmelõimelised rankendused ei oma eelist mitmikprotsesside korral.

One to one mudelit enam ei kasutata, see on vana.

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