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Multi processing system

  Multi processing system ·           Multi processesor system is the sytem that contain two or more processors or CPUS and has ability to simultaneously execute     several programs. Hence the name multi-processor In such a system, multiple processor share the clock, bus, memory and peripheral devices. ·           A multi processor system is also known as parallel system ·           Multi processor system are categorized into two different types:                single user operating system    2.        Multi user operating system   3.         Batch processing operating system 4.        Multi programming operating system   5.       Multi tasking operating sy...
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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 user Operating System

  Multi user operating system ·           In a multi-user operating system, multiple number of user can access different resources of a computer at a same time. ·           The access is provided using a network that consists of various personal computer attached to a mainframe computer system.                                                              diagram of multi -user operating system       ·           The various personal computer can send and receive information to mainframe computer system. ·           The example    of multi-user OS are UNIX, windows 2000,novell netware.            sing...
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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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Time Sharing System and its Requirements

  Time sharing  system ·           Time sharing refers to the allocation of computer resources in a time dependent fashion to several program simultaneously ·           A time sharing system has many user terminals that are connected to same computer simultaneously. Using these terminal, different users can work on a system at the same time ·           Thus, it uses multi programming with a special CPU scheduling among all the last one, and then again beginning from the first one ·           In time sharing system, the CPU time is divided among all the users on schedule basis. ·           It release the CPU under any of the following three conditions: 1.         When the allotted time slice expires. 2.    ...
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