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Questions and Answers
What are some common ways to measure computer system performance?
What are some common ways to measure computer system performance?
- By analyzing the color scheme of the user interface
- By using response time and throughput (correct)
- By measuring the temperature of the system
- By counting the number of users on the system
Which of the following is an incorrect statement about measuring computer system performance?
Which of the following is an incorrect statement about measuring computer system performance?
- Measuring the time spent to complete a task can be an indicator of performance
- Measuring the number of tasks executed in a specific time frame can indicate performance
- Performance can be measured by response time and throughput
- Performance should always be measured in terms of clock cycles (correct)
In the context of measuring performance, which statement is true?
In the context of measuring performance, which statement is true?
- Increasing throughput always leads to improved response time
- Reducing response time always improves throughput
- Enhancing response time has no impact on throughput
- Improving throughput may not necessarily enhance response time (correct)
Which parameter is used to calculate Throughput in a computer system?
Which parameter is used to calculate Throughput in a computer system?
What is Amdahl’s Law primarily concerned with?
What is Amdahl’s Law primarily concerned with?
Which parameter is commonly used to measure Processor Performance?
Which parameter is commonly used to measure Processor Performance?
What type of problem is response time in this model?
What type of problem is response time in this model?
How can throughput generally be enhanced according to the text?
How can throughput generally be enhanced according to the text?
What does the curve in Figure 1.15 illustrate?
What does the curve in Figure 1.15 illustrate?
What is the key focus of performance measurement discussed in the text?
What is the key focus of performance measurement discussed in the text?
How does the text suggest improving response time when task numbers are high?
How does the text suggest improving response time when task numbers are high?
What is the main challenge in reducing response time according to the text?
What is the main challenge in reducing response time according to the text?
What is the formula for speedup when using p processors according to Eq.(1.5)?
What is the formula for speedup when using p processors according to Eq.(1.5)?
What does Amdahl's Law primarily focus on?
What does Amdahl's Law primarily focus on?
Which scenario indicates a super-linear speedup?
Which scenario indicates a super-linear speedup?
What aspect usually leads to a super-linear speedup in performance?
What aspect usually leads to a super-linear speedup in performance?
In measuring performance, what does an improvement in Speedup(E) indicate?
In measuring performance, what does an improvement in Speedup(E) indicate?
Which factor contributes to the theoretical linear speedup scenario according to the text?
Which factor contributes to the theoretical linear speedup scenario according to the text?
What are two common performance measures used in a system?
What are two common performance measures used in a system?
Does increasing throughput always lead to an improvement in response time?
Does increasing throughput always lead to an improvement in response time?
Does reducing response time always result in an improvement in throughput?
Does reducing response time always result in an improvement in throughput?
What is one key focus of Amdahl's Law?
What is one key focus of Amdahl's Law?
How can the concept of speedup be improved in performance measurement?
How can the concept of speedup be improved in performance measurement?
What does the curve in Figure 1.15 typically illustrate in the context of performance measurement?
What does the curve in Figure 1.15 typically illustrate in the context of performance measurement?
Explain the trade-off between throughput and response time as described in the text, and describe the curve illustrated in Figure 1.15.
Explain the trade-off between throughput and response time as described in the text, and describe the curve illustrated in Figure 1.15.
Discuss the challenges in reducing response time according to the text, and explain how the text suggests improving response time when task numbers are high.
Discuss the challenges in reducing response time according to the text, and explain how the text suggests improving response time when task numbers are high.
Describe the different ways the text suggests for enhancing throughput in a computer system.
Describe the different ways the text suggests for enhancing throughput in a computer system.
Discuss the key focus of performance measurement as described in the text, and identify some common ways to measure computer system performance.
Discuss the key focus of performance measurement as described in the text, and identify some common ways to measure computer system performance.
What is the primary factor that determines whether enhancements lead to a super-linear speedup (S(p) > p) or a theoretical linear speedup (S(p) ≤ p)?
What is the primary factor that determines whether enhancements lead to a super-linear speedup (S(p) > p) or a theoretical linear speedup (S(p) ≤ p)?
Based on the provided equations, how would you calculate the speedup achieved when using 4 processors, if the serial execution time is 100 seconds and the parallel execution time with 4 processors is 30 seconds?
Based on the provided equations, how would you calculate the speedup achieved when using 4 processors, if the serial execution time is 100 seconds and the parallel execution time with 4 processors is 30 seconds?
According to Amdahl's Law, what should be the primary focus when trying to improve the performance of a computer system?
According to Amdahl's Law, what should be the primary focus when trying to improve the performance of a computer system?
Explain how the concepts of throughput enhancement and response time reduction relate to each other, and what trade-offs might be involved in prioritizing one over the other.
Explain how the concepts of throughput enhancement and response time reduction relate to each other, and what trade-offs might be involved in prioritizing one over the other.
Provide an example scenario where a super-linear speedup (S(p) > p) might occur, and explain the underlying reasons for this phenomenon based on the information given in the text.
Provide an example scenario where a super-linear speedup (S(p) > p) might occur, and explain the underlying reasons for this phenomenon based on the information given in the text.
Based on the information provided, what potential strategies or techniques could be employed to improve both throughput and response time in a computer system simultaneously?
Based on the information provided, what potential strategies or techniques could be employed to improve both throughput and response time in a computer system simultaneously?
Study Notes
Measuring Performance
- Measuring performance is crucial in computer systems, and it raises questions about how to assess the impact of a computer performance improvement.
- Performance can be measured using response time and throughput, where response time is the time between the start and completion of an event, and throughput is the total amount of work done in a given timeframe.
Performance Measures
- Response time and throughput are two important performance measures.
- Response time is a minimization problem, where the goal is to minimize the time taken to complete a task or task set.
- Throughput is a maximization problem, where the goal is to maximize the amount of work done in a given timeframe.
Throughput Enhancement
- Throughput can be enhanced by adding extra hardware, which reduces latency with respect to the load.
- However, response time is harder to reduce and requires optimization of the architecture or implementing technology.
Throughput Enhancement vs. Response Time
- There is a trade-off between throughput and response time, where increasing throughput can lead to increased response time.
- The curve in Fig. 1.15 illustrates this trade-off, showing that as throughput is maximized, response time is increased.
Performance and User Tasks
- The most important factor in performance is the total time it takes to complete user tasks.
- A faster computer is one that responds to the user in less time, and this can be achieved through parallelization when the task number is high and intermediate relevant results are produced.
Speedup
- Speedup is the observed improvement in performance due to an enhancement E.
- Speedup is measured as the ratio of execution times, as shown in Eqs. (1.3) and (1.4).
- Theoretically, most cases will have a linear speedup, but some cases can present a super-linear speedup.
Possible Targets and Strategies
- There are several techniques, components, and communication interconnections that can be targeted for enhancement.
- The common case and Amdahl's Law theory are key in determining what to prioritize for possible enhancements.
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Description
Explore the importance of measuring system performance and learn about different performance metrics like clocks and FLOPS. Test your knowledge on assessing the impact of computer performance improvements and whether performance should be measured based on time taken to complete a task.
