Information Technology

Priority Scheduling In Priority scheduling, there is a priority number assigned to each process. In some systems, the lower the number, the higher the priority. While, in the others, the higher the number, the higher will be the priority. The Process with the higher priority among the available processes is given the CPU. There are two types of priority scheduling algorithm exists. One is Preemptive priority scheduling while the other is Non Preemptive Priority scheduling. The priority number assigned to each of the process may or may not vary. If the priority number doesn't change itself throughout the process, it is called static priority , while if it keeps changing itself at the regular intervals, it is called dynamic priority . Non Preemptive Priority Scheduling In the Non Preemptive Priority scheduling, The Processes are scheduled according to the priority number assigned to them. Once the process gets scheduled, it will run till the completion. G...

Types of OS There are many types of operating system exists in the current scenario: Batch Operating System In the era of 1970s, the Batch processing was very popular. The Jobs were executed in batches. People were used to have a single computer which was called mainframe. In Batch operating system, access is given to more than one person; they submit their respective jobs to the system for the execution. The system put all of the jobs in a queue on the basis of first come first serve and then executes the jobs one by one. The users collect their respective output when all the jobs get executed. Disadvantages of Batch OS 1. Starvation Batch processing suffers from starvation. If there are five jobs J1, J2, J3, J4, J4 and J5 present in the batch. If the execution time of J1 is very high then other four jobs will never be going to get executed or they will have to wait for a very high time. Hence the other processes get starved. 2. Not Interactive Batc...