What is the status of the management process state when a process is waiting on the processor to handle the request?
READY – The process is waiting to be assigned to a processor. RUNNING – Instructions are being executed. WAITING – The process is waiting for some event to occur(such as an I/O completion or reception of a signal). TERMINATED – The process has finished execution.
What is the state of the processor when a process is waiting for some event to occur?
The process is in blocked state if it is waiting for some event to occur. This event may be I/O as the I/O events are executed in the main memory and don’t require the processor. After the event is complete, the process again goes to ready state.
What happen to a thread when transition from running to waiting state?
When the process needs some other event to be triggered, which is outsides it’s control (like another process to be completed), it transitions from RUNNING to WAITING queue. The thread then transitions from RUNNING to DELAYED queue.
What are the 5 basic states of a process?
This process model contains five states that are involved in the life cycle of a process.
- New.
- Ready.
- Running.
- Blocked / Waiting.
- Exit.
What is the ready state of the process?
5. What is the ready state of a process? Explanation: Ready state of the process means process has all necessary resources which are required for execution of that process when CPU is allocated. Process is ready for execution but waiting for the CPU to be allocated.
How do you become a scheduler?
The path to becoming a scheduler includes the following steps:
- Pursue education. In general, entry-level education requirements for schedulers include a high school diploma or equivalent.
- Gain relevant work experience.
- Prepare your resume.
- Apply to open scheduler positions.
Is process scheduling and CPU scheduling same?
CPU Scheduler or (Short-Term scheduler): Schedules the execution of processes in the ready queue of the system. Process Scheduler or (Long-Term scheduler): Selects which processes to be brought to the ready queue of the CPU.
Which is the best CPU scheduling algorithm?
The calculation of three algorithms shows the different average waiting time. The FCFS is better for a small burst time. The SJF is better if the process comes to processor simultaneously. The last algorithm, Round Robin, is better to adjust the average waiting time desired.
What is waiting time in CPU scheduling?
Waiting time is the total time spent by the process in the ready state waiting for CPU. For example, consider the arrival time of all the below 3 processes to be 0 ms, 0 ms, and 2 ms and we are using the First Come First Serve scheduling algorithm.
How do you calculate waiting time?
Hence, waiting time for P1 will be 0. P1 requires 21 ms for completion, hence waiting time for P2 will be 21 ms. Similarly, waiting time for process P3 will be execution time of P1 + execution time for P2, which will be (21 + 3) ms = 24 ms . For process P4 it will be the sum of execution times of P1, P2 and P3.
How do you calculate waiting time and turnaround time?
In Operating System, various times related to process are- Arrival time, Waiting time, Response time, Burst time, Completion time, Turn Around Time. TurnAround Time = Waiting Time + Burst Time.
What is average waiting time?
Average waiting time (WT) is the time a caller waits in the queue for getting his/her issues resolved by a call center services executive.
How long is it OK to keep a customer waiting?
On average, retail consumers believe that 5 to 10 minutes is the maximum acceptable amount of time that they are prepared to wait in a line. If a line appears to be too long, or the time limit has been exceeded, most customers will make the decision to put their purchases back and walk out the door.
What is an acceptable wait time on the phone?
The traditional call center industry standard service level is 80/20, or 80% of calls answered within 20 seconds, but there are a few reasons why this might not always be an optimal number.
How does SJF calculate waiting time?
For nonpreemptive SJF scheduling, the average waiting time is (10 + 32 + 0 + 3 + 20) / 5 = 13 ms. For RR, the average waiting time is (0 + 32 + 20 + 23 + 40) / 5 = 23ms.
How is waiting time calculated in priority scheduling?
Average waiting time is defined as the sum of total time waited before starting of the processes divided by the total number of processes. Here, average waiting time = (6 + 0 + 16 + 18 + 1) / 5 = 41 / 5 = 8.2.
What is the main problem with the shortest job scheduling and what is its solution?
The main problem with the shortest job first algorithm is starvation [1], [2]. If there is a steady supply of short process, the long process may never get the chance to be executed by the processor. There is a variety of scheduling algorithms proposed in the past to solve the issue of starvation of SJF.
What affect does using shortest job first policy on average turnaround time and on waiting time?
Shortest Job First (SJF) is an algorithm in which the process having the smallest execution time is chosen for the next execution. This scheduling method can be preemptive or non-preemptive. It significantly reduces the average waiting time for other processes awaiting execution.
Why is the shortest job first optimal?
SJF is a scheduling algorithm that assigns to each process the length of its next CPU burst/execution time. SJF is provably optimal, in that for a given set of processes and their CPU bursts/execution times it gives the least average waiting time for each process.
Is Priority Scheduling preemptive?
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.
Which of the following scheduling algorithm the average waiting time for the process to start execution is often quite long?
Explanation : Note that the FCFS scheduling algorithm is nonpreemptive ,the major Disadvantages of FCFS policy is the average waiting time under the FCFS policy is often quite long.
What is first come first serve algorithm?
First Come First Serve (FCFS) is an operating system scheduling algorithm that automatically executes queued requests and processes in order of their arrival. It is the easiest and simplest CPU scheduling algorithm. This is managed with a FIFO queue.
What is true for FCFS scheduling algorithm?
With first come, first served, what comes first is handled first; the next request in line will be executed once the one before it is complete.
What Is First In First Out Scheduling?
First in, first out (FIFO), also known as first come, first served (FCFS), is the simplest scheduling algorithm. FIFO simply queues processes in the order that they arrive in the ready queue. Here we are considering that arrival time for all processes is 0.
What are the disadvantages of FCFS scheduling?
Disadvantages: This scheduling method is nonpreemptive, that is, the process will run until it finishes. Because of this nonpreemptive scheduling, short processes which are at the back of the queue have to wait for the long process at the front to finish.
Which algorithm tends to minimize the process flow time?
Discussion Forum
| Que. | Which of the following algorithms tends to minimize the process flow time ? |
|---|---|
| b. | Shortest Job First |
| c. | Earliest Deadline First |
| d. | Longest Job First |
| Answer:Shortest Job First |