Process Management

Q1. What is Process Management?

Ans. A batch system executes jobs, whereas a time-shared system has user programs, or tasks. Even on a single-user system such as Microsoft Windows, a user may be able to run several programs at one time: a word processor, a web browser, and e-mail package. Even if the user can execute only one program at a time the operating system may need to support its own internal programs activities, such as memory management. In many respects, all these activities are similar, so we call all of them processes.

Mainframe Operating System

 Q1. Write a short note on Mainframe Operating System.

Ans. These room-sized computers still found in major corporate date centers. The operating systems for mainframes are heavily oriented toward processing many jobs at once, most of which need prodigious amount of input/output.

They typically offer three kinds of services:

1. Batch

2. Transaction Processing

3. Time-sharing System

1. A Batch System is one that processes routine jobs without any interactive user present. Claim processing in an insurance company or sales reporting for a chain of stores is typically done in batch mode.

2. Transaction Processing System handle large numbers of small requests.

For example:

Check processing at a bank or airline reservations. Each unit of work is small, but the system must handle hundreds or thousands per second.

3. Time-sharing System allows multiple remote users to run jobs on the computer at once, such as querying a big database.

An example mainframe operating system is OS/390, a descendent of OS/360.