Multiprocessor Operating System

Multiprocessor operating systems are the server operating systems with special features for the communication and the connectivity.

Multiprocessor operating systems are used where multiple CPUs connected into a single system.

Multiprocessor operating system (OS) is almost a regular OS as they also handle system calls, do memory management, provide file system, and also manage input/output devices.

But, there are some extra features available in multiprocessor operating systems, those extra features are listed below:

  • Process synchronization
  • Resource management
  • Scheduling

Here are the list of some various organizations of multiprocessor operating systems:

  • Each CPU has its own OS
  • Master-Slave multiprocessors
  • Symmetric multiprocessors

Now let's describe briefly all the above three different-different organizations of multiprocessor operating systems.

Each CPU has its own OS

To statically divide the memory into as many partitions as there are central processing units and given central processing unit its own private memory and its own private copy of the OS is basically the simplest way to organize a multiprocessor OS or multiprocessor operating system.

Master-Slave Multiprocessors

The master-slave models basically solves almost all the problems of the first model.

In this model, there is a single data structure that keeps track of ready processes.

Now, when a central processing unit goes idle in this model, then it asks the OS for a process to run and it is assigned one.

Symmetric Multiprocessors

Symmetric multiprocessors (SMP) is the third model. In this model, there is one copy of the OS in memory, but any central processing unit can run it.

Now, when a system call is made, then the central processing unit on which the system call was made traps to the kernel and then processes that system call.

This model balances processes and memory dynamically.

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