What happens when two processes have the same priority?

If two processes have the same priority then tie is broken using FCFS. The waiting time for the highest priority process is always zero in preemptive mode while it may not be zero in case of non preemptive mode.

Which algorithm is used for the same priority processes?

If several processes have the same priority, then it will use FCFS algorithm. Scheduling priority consists of two schemes, non-preemptive and preemptive. If there is a process P1 comes on when P0 is running, it will be a priority P1.

Can 2 process have same arrival time?

1 Answer. On a machine with multiple processors, it’s possible that two processors make a request at the same time.

How does an operating system deal with processes when two or more processes have equal priority in priority scheduling algorithm?

Priority scheduling is a non-preemptive algorithm and one of the most common scheduling algorithms in batch systems. Each process is assigned a priority. Process with highest priority is to be executed first and so on. Processes with same priority are executed on first come first served basis.

When a higher priority process is to be executed the current process is?

9. If a higher priority process arrives and wants service, the memory manager can swap out the lower priority process to execute the higher priority process. When the higher priority process finishes, the lower priority process is swapped back in and continues execution.

What is first come first serve scheduling algorithm?

First come first serve (FCFS) scheduling algorithm simply schedules the jobs according to their arrival time. The job which comes first in the ready queue will get the CPU first. The lesser the arrival time of the job, the sooner will the job get the CPU.

Is priority and arrival time same?

Priority scheduling is a non-preemptive algorithm and one of the most common scheduling algorithms in batch systems. Each process is assigned first arrival time (less arrival time process first) if two processes have same arrival time, then compare to priorities (highest process first).

What is first come first serve scheduling?

What are the two steps of a process execution I O & Os burst CPU & I O burst memory & I O burst OS & Memory burst?

Process execution consists of a cycle of CPU execution and I/O wait. Processes alternate between these two states. Process execution begins with a CPU burst. That is followed by an I/O burst, which is followed by another CPU burst, then another I/O burst, and so on.

What are the two steps of a process execution * I O & Os burst CPU & I O burst memory & I O burst OS & Memory burst?

Discussion Forum

Which processes have the highest priority?

A process’ priority can range between 0 (lowest priority) and 127 (highest priority). User mode processes run at lower priorities (lower values) than system mode processes. A user mode process can have a priority of 0 to 65, whereas a system mode process has a priority of 66 to 95.