By Daniel A. Menasce, Lawrence W. Dowdy, Virgilio A.F. Almeida
Useful structures modeling: making plans functionality, availability, safety, and moreComputing structures needs to meet more and more strict caliber of provider (QoS) requisites for functionality, availability, defense, and maintainability. to accomplish those targets, designers, analysts, and capability planners want a way more thorough figuring out of QoS concerns, and the consequences in their judgements. Now, 3 best specialists current an entire, application-driven framework for realizing and estimating functionality. you will study precisely tips to map real-life platforms to exact functionality versions, and use these types to make greater judgements - either up entrance and in the course of the complete approach lifecycle. insurance comprises: * state of the art quantitative research suggestions, supported through huge numerical examples and workouts * QoS concerns in specifications research, specification, layout, improvement, trying out, deployment, operation, and process evolution * particular eventualities, together with e-Business and database providers, servers, clusters, and knowledge facilities * concepts for settling on capability congestion at either software program and degrees * functionality Engineering suggestions and instruments * distinct answer suggestions together with distinctive and approximate MVA and Markov Chains * Modeling of software program rivalry, fork-and-join, provider cost variability, and precedence
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Maximum of four seconds of page download time for all requests submitted over non-secure connections and maximum of six seconds of page download time for requests submitted through secure connections. • Minimum throughput of 2,000 page downloads per second. The QN model required to answer the performance questions at the beginning of this section is a multiclass mixed QN model. It is mixed because some classes are open and some are closed. The representation of this model for the database server example is shown in Fig.
When the server becomes available, the customer that has the highest priority is served next. If there is more than one customer with the same priority, FCFS is used to break the tie within each priority class. There are many possible variations of priority-based queuing disciplines: static priorities vs. dynamic priorities, preemptive vs. non-preemptive, preemptive resume vs. preemptive restart. In the static priority case, the priority of a customer does not change with time. With preemptive priority, arriving customers of higher priority are allowed to immediately seize a resource that is being used by a customer of lower priority.
1. The CPU is resource 1 and the disks are numbered from 2 to 4. 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.
Performance by Design: Computer Capacity Planning by Example by Daniel A. Menasce, Lawrence W. Dowdy, Virgilio A.F. Almeida