By Daniel A. Menasce, Lawrence W. Dowdy, Virgilio A.F. Almeida
Functional structures modeling: making plans functionality, availability, protection, and moreComputing structures needs to meet more and more strict caliber of carrier (QoS) standards for functionality, availability, safety, and maintainability. to accomplish those objectives, designers, analysts, and capability planners want a way more thorough knowing of QoS concerns, and the results in their judgements. Now, 3 prime specialists current a whole, application-driven framework for knowing and estimating functionality. you are going to study precisely how one can map real-life platforms to actual functionality types, and use these types to make larger judgements - either up entrance and through the complete procedure lifecycle. assurance contains: * cutting-edge quantitative research suggestions, supported via wide numerical examples and routines * QoS matters in specifications research, specification, layout, improvement, checking out, deployment, operation, and approach evolution * particular eventualities, together with e-Business and database prone, servers, clusters, and information facilities * suggestions for choosing power congestion at either software program and degrees * functionality Engineering thoughts and instruments * distinct answer strategies together with distinct and approximate MVA and Markov Chains * Modeling of software program competition, fork-and-join, provider price variability, and precedence
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Extra resources for Performance by Design: Computer Capacity Planning by Example
1. What is the average service time per request on each disk? What is the database server's throughput? 1. Closed QN model of a database server. 1. , the sum of the number of reads and writes per second. This value is indicated in the fourth column of the table. Using the Utilization Law, the average service time is computed as Si as Ui/Xi. 0108 sec. 8 tps. 2 Service Demand Law Service demand is a fundamental concept in performance modeling. The notion of service demand is associated both with a resource and a set of requests using the resource.
And indicates that as soon as one job completes, another (equivalent) job is started. Thus, the number of jobs in the system remains constant. 3. Queuing network for a database server with a closed workload. 6 The Database Server Example: a Mixed Model Consider again the database server of the previous sections. 1 and the batch management reports should be allowed to execute at the same time at any time of day. 2. The performance goal for online transactions are specified in terms of an upper bound on the average response time.
Menascé, "Two-level iterative queuing modeling of software contention," Proc. Tenth IEEE/ACM International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS 2002), Fort Worth, Texas, October 12-16, 2002, pp. 267 276.  D. A. Menascé and V. A. F. Almeida, Scaling for E-business: technologies, Models, Performance, and Capacity Planning, Prentice Hall, Upper Saddle River, New Jersey 2000. 42 Part I: The Practice of Performance Engineering Part I: The Practice of Performance Engineering 43  J.