Analyzing Computer System Performance with Perl::PDQ

By Neil J. Gunther

To remedy functionality difficulties in glossy computing infrastructures, frequently comprising millions of servers working hundreds of thousands of functions, spanning a number of stages, you wish instruments that transcend mere reporting. you wish instruments that let functionality research of software workflow around the complete company. that is what PDQ (Pretty rattling quickly) presents. 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 software structure should be represented as a circuit of queueing delays, PDQ is a ordinary healthy for interpreting procedure performance.

 

Building at the luck of the 1st version, this significantly elevated moment version now contains 4 components. half I comprises the foundational thoughts, in addition to a brand new first bankruptcy that explains the relevant function of queues in winning functionality research. half II offers the fundamentals of queueing idea in a hugely intelligible variety for the non-mathematician; little greater than high-school algebra being required. half III offers many functional examples of ways PDQ should be utilized. The PDQ handbook has been relegated to an appendix partially IV, in addition to recommendations to the routines contained in each one chapter.

Throughout, the Perl code listings were newly formatted to enhance clarity. The PDQ code and updates to the PDQ guide can be found from the author's website at www.perfdynamics.com

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316 10 easy methods to Scale an Elephant with PDQ . . . . . . . . . . . . . . . . . . . . . . 317 10. 1 An Elephant tale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317 10. 1. 1 what's Scalability? . . . . . . . . . . . . . . . . . . . . . . . . . . . 318 10. 1. 2 SPEC Multiuser Benchmark . . . . . . . . . . . . . . . . . . . . 319 10. 1. three Steady-state Measurements . . . . . . . . . . . . . . . . . . . . . 321 10. 2 components of the Elephant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321 10. 2. 1 carrier call for half . . . . . . . . . . . . . . . . . . . . . . . . . . 322 10. 2. 2 imagine Time half . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322 10. 2. three person Load half . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322 10. three PDQ Scalability version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323 xxvi Contents 10. three. 1 Interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324 10. three. 2 Amdahl’s legislation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326 10. three. three The Elephant’s Dimensions . . . . . . . . . . . . . . . . . . . . . 328 10. four assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 eleven Client/Server research with PDQ . . . . . . . . . . . . . . . . . . . . . . . . . . 331 eleven. 1 advent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 eleven. 2 Client/Server Architectures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332 eleven. 2. 1 Multitier Environments . . . . . . . . . . . . . . . . . . . . . . . . 333 eleven. 2. 2 Three–Tier innovations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333 eleven. three Benchmark setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 eleven. three. 1 functionality eventualities . . . . . . . . . . . . . . . . . . . . . . . . . 335 eleven. three. 2 Workload Characterization . . . . . . . . . . . . . . . . . . . . . 337 eleven. three. three dispensed Workflow . . . . . . . . . . . . . . . . . . . . . . . . . . 339 eleven. four Scalability research with PDQ . . . . . . . . . . . . . . . . . . . . . . . . . . 340 eleven. four. 1 Benchmark Baseline . . . . . . . . . . . . . . . . . . . . . . . . . . . 341 eleven. four. 2 consumer Scaleup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346 eleven. four. three Load Balancer Bottleneck . . . . . . . . . . . . . . . . . . . . . . 349 eleven. four. four Database Server Bottleneck . . . . . . . . . . . . . . . . . . . . . 349 eleven. four. five creation purchaser Load . . . . . . . . . . . . . . . . . . . . . . . . 349 eleven. four. 6 Saturation consumer Load . . . . . . . . . . . . . . . . . . . . . . . . . 350 eleven. four. 7 Per-Process research . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 eleven. five evaluate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353 workouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354 12 internet software research with PDQ . . . . . . . . . . . . . . . . . . . . . . 355 12. 1 creation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355 12. 2 HTTP Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355 12. 2. 1 HTTP functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360 12. 2. 2 HTTP research utilizing PDQ . . . . . . . . . . . . . . . . . . . . 361 12. 2. three Fork-on-Demand research . . . . . . . . . . . . . . . . . . . . . . 361 12. 2. four Prefork research . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363 12. three Two-Tier PDQ version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369 12. three. 1 info and knowledge aren't an identical . . . . . . . . . 369 12. three. 2 HTTPd functionality Measurements . . . . . . . . . . . . . 369 12. three. three Java functionality Measurements . . . . . . . . . . . . . . . . 369 12. four Middleware research utilizing PDQ . . . . . . . . . . . . . . . . . . . . . . . . 372 12. four. 1 energetic consumer Threads . . . . . . . . . . . . . . . . . . . . . . . . . . 372 12. four. 2 Load try out effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374 12. four. three Derived provider calls for . . . . . . . . . . . . . . . . . . . . . . . 375 12. four. four initial PDQ version .

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