Chapter 4 : Software Execution Model

Question 1

What is software execution model?

Answer 1

Provides a static analysis of the mean, best and worst-case scenarios in system

Question 2

Does software execution model use contention?

Answer 2

False, characterizes the resource requirements of proposed software alone in absence of workloads, multiple users and delays.

Question 3

When is an execution graph created?

Answer 3

For each performance scenario

Question 4

What do basic nodes represent?

Answer 4

Processing steps at the lowest detail

Question 5

What does the simple-model reccomend?

Answer 5

Details that are not permitted to performance are excluded

Question 6

What are repetition node?

Answer 6

Repetition node represent one or more nodes that repeated

Question 7

What is repetition factor?

Answer 7

Associated with the node that specifies number of times processing steps repeat

Question 8

What are case node?

Answer 8

Represent node that has a conditional execution based on probability

Question 9

What are attached node?

Answer 9

Represent the steps that may be executed

Question 10

What is a Pardo node?

Answer 10

Represents parallel execution scenario within a scenario

Question 11

What is a Split Node?

Answer 11

Represent new processing threads.

Question 12

What are the graph restrictions?

Answer 12

1. Graphs and subgraphs can only have one initial node

2. Loop restriction: All loops in graph must be attached to repetition node

Question 13

What is the primary purpose of software execution models?

Answer 13

1. Quick check of best-case response time to see if the system will lead to adequate performance
2. Assess the performance impact of alternatives
3. Identify critical parts of the system for performance management
4. Derive parameters for system execution model

Question 14

What is one of the most difficult resources to estimate?

Answer 14

CPU Usage