What are the data gathering procedures?
The definition of data gathering procedure is that it is the technique used to obtain the information used in a dissertation to substantiate the claims made by a writer.
Which is an example of gathering primary data?
Primary data is a type of data that is collected by researchers directly from main sources through interviews, surveys, experiments, etc. For example, when doing a market survey, the goal of the survey and the sample population need to be identified first.
What is the main drawback of schedule?
Lack of Flexibility With a production schedule, you may not be able to adapt quickly enough to avoid problems. Once the materials are on the way and the staff is scheduled to work, it can be very difficult to stop the process and do something else if you experience a problem.
What are the advantages of first come first serve?
Advantages of the First Come First Serve Scheduling
- It is the simplest and easy to implement algorithm programmatically. The FCFS algorithm is implemented using a FIFO Queue in the data structure.
- It works well with the processes that have long burst time.
What is the drawback of SJF algorithm?
SJF may cause starvation, if shorter processes keep coming. This problem is solved by aging. It cannot be implemented at the level of short term CPU scheduling.
What is drawback of FCFS scheduling algorithm?
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. Throughput is not efficient.
What is the best 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 FCFS 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 the difference between FCFS and SJF?
Shortest Job First (SJF) Scheduling Algorithm is based upon the burst time of the process….Note –
| First Come First Served (FCFS) | Shortest Job First (SJF) |
|---|---|
| FCFS is non preemptive in nature. | SJF is also non-preemptive but its preemptive version is also there called Shortest Remaining Time First (SRTF) algorithm. |
What happens if Q is too large in RR scheduling?
If time quantum is too large, the response time of the processes is too much which may not be tolerated in interactive environment. If time quantum is too small, it causes unnecessarily frequent context switch leading to more overheads resulting in less throughput.
What are different scheduling algorithms?
Six types of process scheduling algorithms are: First Come First Serve (FCFS), 2) Shortest-Job-First (SJF) Scheduling 3) Shortest Remaining Time 4) Priority Scheduling 5) Round Robin Scheduling 6) Multilevel Queue Scheduling. The CPU uses scheduling to improve its efficiency.
What is starvation OS?
Starvation is the problem that occurs when high priority processes keep executing and low priority processes get blocked for indefinite time. In heavily loaded computer system, a steady stream of higher-priority processes can prevent a low-priority process from ever getting the CPU.
How starvation is avoided in OS?
A possible solution to starvation is to use a scheduling algorithm with priority queue that also uses the aging technique. Aging is a technique of gradually increasing the priority of processes that wait in the system for a long time.
Why Semaphore is used in OS?
Semaphores are integer variables that are used to solve the critical section problem by using two atomic operations, wait and signal that are used for process synchronization. The wait operation decrements the value of its argument S, if it is positive. If S is negative or zero, then no operation is performed.
What are the two options to break the deadlock?
There are two approaches of breaking a Deadlock:
- Process Termination: To eliminate the deadlock, we can simply kill one or more processes.
- Resource Preemption: To eliminate deadlocks using resource preemption, we preepmt some resources from processes and give those resources to other processes.
What is deadlock example?
A deadlock is a condition where a program cannot access a resource it needs to continue. For example, the following situation will cause a deadlock between two processes: Process 1 requests resource B from process 2. Resource B is locked while process 2 is running.
What is the simplest deadlock recovery method?
• Recovery through killing processes. – Crudest but simplest way to break a deadlock. – Kill one of the processes in the deadlock cycle: the other processes. get its resources. – Choose process that can be rerun from the beginning.
What are the two options for recovery from deadlock explain each clearly?
There are two options for breaking a deadlock. One is simply to abort one or more processes to break the circular wait. The other is to preempt some resources from one or more of the deadlocked processes.