Operating Systems Ii - Mid Term Test Ii

Front 1

List three functions that the Operating System services provide that are considered to be helpful to the user?

Back 1

1. UI
2. Program execution
3. I/O operations

Front 2

List 2 common Application Program Interfaces?

Back 2

1. Win32 API
2. Java API

Front 3

In relation to System calls what are the 3 general methods used to pass parameters to the OS?

Back 3

- Pass the parameters in registers (Simplest)

- Parameters stored in a block, or table in memory and address of block passed as a parameter in a register

- Placed, or pushed onto the stack by the program & popped off the stack by the OS

Front 4

When designing and implementing an OS list...
3 System &
3 User goals?

Back 4

- User goals
easy to learn,
reliable
safe

- System goals
design
implement & maintain
flexible

Front 5

When designing and implementing an OS it is important to separate Policies and Mechanisms. Distinguish between the two?

Back 5

- Mechanisms determine how to do something

- Policies decide what will be done

Front 6

Complete the Diagram in relation to Virtual Machines

Back 6

Answer: Kernel, kernel, kernel and VM1, VM2, VM3

Front 7

What are the three classifications of Multiprocessor systems?

Back 7

1. Loosely coupled or distributed multiprocessor \ cluster

2. Functionally specialized processors

3. Tightly coupled multiprocessor

Front 8

Briefly describe the master/slave architecture when assigning process to processors?

Back 8

1. Key Kernel functions always run on a particular processor

2. Master is responsible for scheduling

3. Slave sends requests to the master

4. Is simple & requires little enchancement to a uniprocessor multiprogramming OS

5. Conflict resolution is simplified because one processor has control of all memory & I/O resources

Front 9

Real-time operating systems have requirements in five general areas – what are these?

Back 9

1. Determinism
2. Responsiveness
3. User control
4. Reliability
5. Fail-soft operation

Front 10

List 4 items of information that may be used for Deadline Scheduling?

Back 10

1. Ready time
2. Starting deadline
3. Completion deadline
4. Processing time

Front 11

Explain the term Process Affinity?

Back 11

Ready thread is scheduled onto the last processor that it ran on

Front 12

Explain the difference between Hard and Soft Real Time tasks?

Back 12

Hard real-time tasks - Must meet deadline, otherwise cause damage or fatal error

Soft real-time tasks - Has deadline not mandatory. Task completes even if deadline has passed

Front 13

In relation to Synchronization Granularity and Processes complete the following…

Back 13

- Single
- Multitasking
- Multiprocessing
- Distributed
- Unrelated

Front 14

What are the four general classes of Client / Server Applications?

Back 14

1. Host-based processing
2. Server-based processing
3. Client-based processing
4. Cooperative processing

Front 15

What are the advantages of using Middle-ware in client server development?

Back 15

1. Developers must have set of tools that provide a uniform means & style to system resources across all platforms

2. Enable programmers to build applications - look & feel the same & use same methods to access data regardless of location

3. Use of standard programming interfaces & protocols - sit between application & communications software & OS

Front 16

Define the term cluster?

Back 16

Group of interconnected computers working together as a unified computing resource, creates the illusion of being one machine

Front 17

List three benefits of Clusters?

Back 17

1. Absolute scalability
2. Incremental scalability
3. High availability

Front 18

What is the purpose of Load Balancing within a Cluster?

Back 18

When new computer is added to a cluster, the load-balancing automatically adds this computer in the scheduling applications