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Batch Processing Operating System

  Batch processing system ·           Batch processing is one of the oldest method    of running the programs ·           The computer in the past were very large in size and their I/O devices were very different from those that are used today. The job processing was not interactive as it is today. ·           The user did not interact directly with computer system.   ·           The process scheduling , memory management, file management and I/Omanagement functions are quite simple in batch processing system   1.         Process scheduling (i.e. allocation strategy for a processor is typically in order of their arrival i.e. first come first served(FCFS)basis.   2.         Memory management  is done by divi...
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Multi Programming Operating System

  Multi programming  system ·           Multi programming operating system allows multiple users to execute multiple programs using a single CPU concurrently i.e. at the same time. ·           In multiprogramming several process are kept in the main memory and CPU execute all these processes concurrently. It means, the CPU immediately switches from one process to next that are ready to get executed ·           In such an operating system when one process start process start performing the instructions from several programs at the same time. ·           Rather, it means that there are number program available to CPU and that portion of one is executed, then segment of another and so on                                 ...
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Defination of OS(operating system) and its concepts

    What do you mean by operating system?     Definition :  An operating system is a program that act as an interface between the user of a computer and the                                      Computer hardware. Operating system is a first program that gets loaded into the memory through a process called booting. Concepts of operating system : ·                       The purpose of operating system is to provide an environment in which a user can execute program in a convenient and efficient manner. ·                       Operating system is an integrated set of program that ma...
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Distributed system

  Distributed system ·           A distributed system is a collection of processor located in geographical dispersal physical location. ·           In this system, the workhold is distributed or divided between two or more computers that are linked together by communication network . that is the different processors communicate using communication links, such as telephone lines and buses3 ·           The various processors do not share memory, clock ,or peripheral devices instead each processors has its local memory. ·           The purpose of distributed system is to provide an efficient and convenient environment for sharing of resources. ·           Some example of distributed operating system are amoeba, angle, chorus, much, alpha kernel. ·   ...
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Multi threading operating system

  Multi threading  operating system ·           Multi threading is a technique in which a process, executing an application is divided into threads that can run concurrently ·           A thread is a dispatch able unit of work. It includes    a processor context and its own data area for sack . ·           A thread execute sequentially and is interruptible so that the processor can turn to another thread. ·           Thus, a thread represents a light weight process and is the smallest unit of CPU utilization it is like a mini process. ·           A process, on other hand is a collection of one or more threads and associated system resources ·           A thread is not a process by itself. Cannot run on...
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