Ответы на вопросы по Perfomance Evaluation (Queueing Network Modelling)

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Queueing Network Modelling
1.	Which of the following is an appropriate approximation of the arrival instant queue length Ak(N) that can be used to avoid the MVA recursion in single-class closed models? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
2.	By monitoring a system we are able to measure the following data: - CPU demand: 4 seconds per transaction; - CPU utilization: 50%; - Response time: 15 seconds per transaction; - Average think time: 25 second; Which is the number of users? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
3.	Which of the following is the lower asymptotic bound on response time for single-class closed queuing models under the low-load condition? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
4.	In a batch system the CPU is performing, on average, 12 operations per second. Moreover, we know that each batch transaction requires, on average, 4 accesses to the CPU. A disk in the system is managing, on average, 18 operations per second. Which is the average number of accesses to the disk required for each batch transaction? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
5.	By monitoring a system we are able to measure the following data: CPU demand of 4 seconds, CPU utilization of 80%, response time of 15 seconds and 10 active users. Which is the average think time of these users? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
6.	A computing system has been monitored and the following data has been collected - measurement interval: 1 hour; - number of users: 80; - average response time per transaction: 5 second; - number of completed transactions: 3600; - utilization of CPU: 80%; - utilization of disk 1: 50%; - utilization of disk 2: 50%; On average, how many users are not thinking? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
7.	Consider a multi class system with two classes of transactions. We have the following information about the system: - class 1 response time: 8 seconds; - class 2 response time: 6 seconds; - class 1 throughput: 5 transaction per second; - class 2 throughput: 3 transactions per second; Which is the average response time of the system? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
8.	Which of the following is the lower asymptotic bound on response time for single-class closed queuing models under the high-load condition? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
9.	By monitoring a system we are able to measure the following data: - CPU utilization: 50%; - Response time: 15 seconds per transaction; - Average think time: 5 seconds; - Number of users: 100 Which is the service demand of the CPU? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение
10.	A computing system has been monitored and the following data has been collected: - measurement interval: 1 hour; - number of completed transactions: 900; - number of users: 60; - average number of users not waiting for response from the system: 57.5; Which is the average response time? узнать ПРАВИЛЬНЫЙ ответ \| добавить объяснение