Types of operating system

Description of operating systems.

1. Types of Operating System Presented By- Md. Ashikur Rahman ID no: 191-15-2469

2. What is an Operating System? A program that acts as an Intermediary Between a user of a computer and the Computer hardware.

3. What is an Operating System? A program that acts as an Intermediary Between a user of a computer and the Computer hardware.

4. Simple Batch System The types Operating System are Multi-programming System Real time Operating System Multi-processor System Distributed Operating System

5. SIMPLE BATCH SYSTEM In Batch processing same type of jobs batch (BATCH- a set of jobs with similar needs t ogether and execute at a time. The OS was always resident in memory

6. Advantages of SIMPLE BATCH SYSTEM A Data center’s staff can schedule batch processing during times when the computer s are otherwise idle, such as overnight. The computer operators can delay or prioritize different batches easily, depending on circumstances.

7. Disadvantages of SIMPLE BATCH SYSTEM Zero interaction between user and computer. No mechanism to prioritize processes. CPU is often idle, because the speeds of the mechanical I/O devices is slower than CPU Disadvantages

8. Example of SIMPLE BATCH SYSTEM 1. Payroll run for company 2. Gas and electricity bills produced by Batch system.

9. Multi-Programming SYSTEM In this the operating system, picks and begins To execute one job from memory. Multiprogramming system, CPU will never be Idle and keeps on processing.

10. Advantages of Multi-programming SYSTEM It increases CPU utilization. It maximizes the total job throughput of a computer. Better reliability-if one processor breakdown then other takes its workload.

11. Disadvantages of Multi-programming SYSTEM It must keep track of all kinds of jobs. Each system requires large chunks of hard drive space which cannot be allocated to programs. Poor CPU usage when only one program is present in memory. Disadvantages

12. Example of Multi-programming SYSTEM Microcomputers like as MP/M , XENIX, and ESQview . 2. Windows O/S 3. UNIX O/S

13. Real-Time Operating SYSTEM Real time system is defined as a data p rocessing system in which the time interval r equired to process and respond to inputs is so small that it controls the environment. There are two types of real-time operating systems. Hard real-time systems. Soft real-time systems.

14. Hard Real-Time Operating SYSTEM Air traffic control Nuclear power plant control Vehicle sub-systems control

15. Soft Real-Time Operating SYSTEM Websites Video games Telecom networks

16. Advantages of Real-time Operating SYSTEM RTOS give maximum consumption of the system and gives us more output. Due to small size of programs RTOS can also be used in embedded systems like in transport and others. RTOS is error free that mean it has no chances of error in performing tasks.

17. Disadvantages of Real-time Operating SYSTEM There are only limited tasks run at the same time and other task have to wait. RTOS used lot of system resources which is not as good and is also expensive. Multi tasking is done few of times and this is the main disadvantage of RTOS. Disadvantages

18. Multi-Processor Operating SYSTEM A multiprocessor system consists of several Processors that shar e a common physical m emory. Multiprocessor system provides h igher computing power and speed.

19. Advantages of Multi-Processor Operating SYSTEM Enhanced performance. Execution of several tasks by different processors concurrently, increases the system’s throughput.

20. Disadvantages of Multi-Processor Operating SYSTEM It’s more complex than other operating systems. It requires context switching which slightly impacts performance. Disadvantages

21. Example of Multi-Processor Operating SYSTEM UNIX Linux Mac OS X Window XP Windows 2000 etc.

22. Distributed Operating SYSTEM The motivation behind developing distributed operating systems is the a vailability of powerful and inexpensive microprocessors and advances In communication technology.

23. Advantages of Distributed Operating SYSTEM If one machine crashes, the system as a whole can still survive. A distributed system may have more total computing power than a mainframe. Since it is an open system it is always ready to communicate with other systems.

24. Disadvantages of Distributed Operating SYSTEM Distributed systems will have an inherent security issue. If the network gets saturated then problems with transmission will surface. There is currently very little less software for Distributed system. Disadvantages

25. Example of Distributed Operating SYSTEM Windows 2003 application server Linux(apache server) Ubuntu