1.) in preemptive scheduling we prempt the currently executing process, in non preemptive scheduling we allow the current process to finish its CPU burst time... 2.) in preemptive scheduling the process is forcibly sent to waiting state when a process with higher priority comes to CPU, in non preeemptive scheduling the process at running state can not be forced to leave the CPU until it completes........
In preemptive multitasking scheduling processes , scheduler can interrupt one running process and and allocate CUP to another process without letting the complete the task of first process. Window 95 introduced preemptive scheduling and Mac also uses this scheduling process. Bharat Rawal
scheduling algorithm
the objective of multiprograming is to have some processs running at aal time,so as to maximizing cpu utillization .this process is called scheduling.
dynamic job shop scheduling is the scheduling of the machine it can processes different jobs at time. it switches from one job to another job. in real time process jobs are executed based on the time.
Preemptive scheduler reruns scheduling decision when process becomes ready. If the new process has priority over running process, the CPU preempts the running process and executes the new process. Non-preemptive scheduler only does scheduling decision when running process voluntarily gives up CPU. In effect, it allows every running process to finish its CPU burst.
System Management
System Management
the total time that staying in the queue that wait for process of each process.
Round robin is the scheduling algorithm that is utilized by the CPU, or central processing unit, during the execution of the process. It is specifically designed for time sharing systems.
turn around time is the difference of time between the time of arrival of process and time of dispatch of process or we can say the time of completion of process
FCFS is "First come, first served" Scheduling: Processes are given time on the CPU in the order that they arrive. eg: Process | Arrival Time (ns) | Burst Time (ns) P1 0 20 P2 0 10 P3 0 5 Scheduling Diagram for FCFS: | P1 | P2 | P3 | 0ns 20ns 30ns 35ns