Feedback Control of Computing Systems by Joseph L. Hellerstein, Yixin Diao, Sujay Parekh, Dawn M.

By Joseph L. Hellerstein, Yixin Diao, Sujay Parekh, Dawn M. Tilbury

A pioneering reference on keep watch over conception designed particularly for computing device pros

In today’s automated economic climate, the profitability and availability of many companies depend on a transparent figuring out of the dynamics in their computing structures, specifically how they relate to adjustments in workloads and configuration. widespread, dramatic alterations in those parts can degrade courses or even reason disasters, as frequently proven on a company’s eCommerce website.

In the 1st e-book ever to handle this very important factor, suggestions keep an eye on of Computing structures bargains application designers and desktop scientists a hands-on source that distills the necessities of regulate idea had to successfully tackle those matters. basically meant for pros engaged within the research and layout of computing platforms, who frequently lack the conceptual instruments to handle the dynamics of source administration, the textual content presents a bunch of worthwhile good points:

  • MATLAB code for the answer of difficulties and case studies
  • Numerous IT examples, comparable to tuning the Apache HTTP server and the IBM Lotus Domino Server
  • Examples conscientiously selected to demonstrate key ideas and supply the foundation for modeling real-world platforms
  • Several appendices for convenient reference

A versatile "road map" process is helping varied practitioners use the textual content in hugely particular methods, reckoning on their specific concentration, making suggestions keep watch over of Computing platforms a useful source for platforms designers, IT managers, desktop scientists, in addition to different researchers within the box.

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Example text

Queue length, utilization) and using a moving-average filter to smooth stochastics in the output. Further details on queueing systems can be found in [35] and [4]. 3 Apache HTTP Server Web servers are an essential part of information distribution and electronic commerce. , browse a page or download a file) to one or more Web servers. The Web server replies with the appropriate information. TLFeBOOK COMPUTER EXAMPLES OF FEEDBACK CONTROL SYSTEMS 17 Worker 1 Busy Wait KeepAlive Idle Connection Requests Accept Queue Connection Close Busy Wait Idle Worker MaxClients Fig.

To account for differences in loads on the servers as well as differences in their processing capabilities, a routing weight is employed. Servers with a larger weight receive more requests. 14 depicts a feedback control system for achieving balanced utilizations (or other metrics) across the servers in a load-balancing system. The target system encompasses multiple blocks, as indicated by the dashed rectangle. 13. The block “computed balance level” is added to calculate the degree to which the servers are balanced for one or more metrics.

2 Example of an unstable feedback control system for the Apache HTTP Server. The instability results from having an improperly designed controller. reference input for CPU utilization, and the line with markers is the measured value. During the first 300 seconds, the system operates in open loop. 5 is used. At this point, the system begins to oscillate and the amplitude of the oscillations increases. This is a result of a controller design that overreacts to the stochastics in the CPU utilization measurement.

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