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Analyzing Computer System Performance with Perl::PDQ by Neil J. Gunther

By Neil J. Gunther

To remedy functionality difficulties in glossy computing infrastructures, frequently comprising hundreds of thousands of servers operating 1000's of functions, spanning a number of stages, you would like instruments that transcend mere reporting. you would like instruments that allow functionality research of software workflow around the complete company. that is what PDQ (Pretty rattling fast) offers. PDQ is an open-source functionality analyzer in keeping with the paradigm of queues. Queues are ubiquitous in each computing atmosphere as buffers, and because any program structure will be represented as a circuit of queueing delays, PDQ is a average healthy for examining method performance.

Building at the luck of the 1st version, this significantly improved moment version now contains 4 elements. half I includes the foundational innovations, in addition to a brand new first bankruptcy that explains the vital position of queues in profitable functionality research. half II offers the fundamentals of queueing thought in a hugely intelligible kind for the non-mathematician; little greater than high-school algebra being required. half III provides many useful examples of ways PDQ could be utilized. The PDQ guide has been relegated to an appendix partially IV, in addition to ideas to the workouts contained in every one chapter.

Throughout, the Perl code listings were newly formatted to enhance clarity. The PDQ code and updates to the PDQ handbook can be found from the author's site at

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Only at the end of the paper does he allude to solving a singleserver queue (M/D/1). All details are omitted. 1917 Erlang presents extensions to his 1909 paper by analyzing the performance of the Internet of his day—the early telephone system. This includes multiple servers or trunk lines with a “waiting room” or buffer (see Sect. 1), as well as multiple servers without a buffer (see Sect. 3). 7 A Brief History of Buffers 19 1917 and the application of queueing theory to computer performance analysis by Allan Scherr in 1967.

Let’s look at an example to see how the stretch factor can be used. 2 (Email Anti-spam Farm). All the large Web sites have email spam analyzers. , SpamAssassin (spamassassin. org). One such Web site had a server farm with some 100 four-way servers doing this job 24 by 7. The individual load averages were monitored to check load balancing across all 100 servers. 1. 2. It gave results that were in excellent agreement with monitored queue lengths observed at the Web site. 6 How Long Should My Queue Be?

2. 1976 Jeff Buzen introduces operational equations for Markovian queues. See Chap. 4, Sect. 4. 1977 Pierre-Jacques Courtois introduces formal concepts of hierarchical decomposition and aggregation for queueing models [Courtois 1985] [Bloch et al. 1998, Chap. 4]. See Sects. 10. 1977 Ken Sevcik introduces the shadow server concept for analyzing nonFIFO scheduling within the context of the MVA algorithm. See Sect. 3 and Chap. 8. 1978 Peter Denning and Jeff Buzen extend their operational approach.

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