By Neil J. Gunther
To resolve functionality difficulties in smooth computing infrastructures, usually comprising millions of servers working enormous quantities of purposes, spanning a number of levels, you wish instruments that transcend mere reporting. you wish instruments that allow functionality research of program workflow around the complete firm. That's what PDQ (Pretty rattling quickly) presents. PDQ is an open-source functionality analyzer in accordance 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 ordinary healthy for interpreting approach functionality. construction at the good fortune of the 1st version, this significantly increased moment variation now includes 4 elements. half I comprises the foundational thoughts, in addition to a brand new first bankruptcy that explains the principal position of queues in winning functionality research. half II offers the fundamentals of queueing idea in a hugely intelligible sort for the non-mathematician; little greater than high-school algebra being required. half III offers many functional examples of ways PDQ may be utilized. The PDQ handbook has been relegated to an appendix partially IV, besides recommendations to the routines contained in every one bankruptcy. all through, 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
Read or Download Analyzing Computer System Performance with Perl::PDQ PDF
Similar programming books
Get a high-quality grounding in all of the basics of Cocoa contact, and keep away from difficulties in the course of iPhone and iPad app improvement. With Programming iOS four, you'll dig into Cocoa and how you can paintings successfully with Objective-C and Xcode. This e-book covers iOS four in a rigorous, orderly fashion—ideal no matter if you’re drawing close iOS for the 1st time or want a connection with bolster present abilities.
Building allotted functions is hard adequate with no need to coordinate the activities that cause them to paintings. This useful consultant exhibits how Apache ZooKeeper is helping you deal with dispensed structures, so that you can concentration in most cases on program common sense. in spite of ZooKeeper, imposing coordination projects isn't trivial, yet this ebook offers strong practices to provide you a head begin, and issues out caveats that builders and directors alike have to look forward to alongside the way.
In 3 separate sections, ZooKeeper individuals Flavio Junqueira and Benjamin Reed introduce the foundations of dispensed platforms, supply ZooKeeper programming suggestions, and contain the data you want to administer this service.
• find out how ZooKeeper solves universal coordination initiatives
• discover the ZooKeeper API’s Java and C implementations and the way they range
• Use easy methods to tune and react to ZooKeeper nation adjustments
• deal with mess ups of the community, program techniques, and ZooKeeper itself
• find out about ZooKeeper’s trickier facets facing concurrency, ordering, and configuration
• Use the Curator high-level interface for connection administration
• get to grips with ZooKeeper internals and management instruments
Programming in Objective-C, 6th version
up-to-date for OS X 10. nine Mavericks, iOS 7, and Xcode five
Programming in Objective-C is a concise, rigorously written educational at the fundamentals of Objective-C and object-oriented programming for Apple's iOS and OS X structures.
The ebook makes no assumptions approximately previous adventure with object-oriented programming languages or with the c programming language (which Objective-C relies upon). due to this, either newcomers and skilled programmers alike can use this e-book to quick and successfully research the basics of Objective-C. Readers may also examine the recommendations of object-oriented programming with no need to first study all the intricacies of the underlying c program languageperiod.
This special approach to studying, mixed with many small application examples and routines on the finish of every bankruptcy, makes Programming in Objective-C splendid for both school room use or self-study.
This version has been totally up-to-date to include new Objective-C positive aspects and applied sciences brought with Xcode five, iOS 7, and Mac OS X Mavericks.
“The most sensible e-book on any programming language that I’ve ever learn. with the intention to study Objective-C, purchase it. ”–Calvin Wolcott
“An very good source for a brand new programmer who desires to examine Objective-C as their first programming language–a woefully underserved industry. ”–Pat Hughes
Contents at a look
half I - The Objective-C Language
2 Programming in Objective-C
3 sessions, gadgets, and techniques
4 info kinds and Expressions
5 software Looping
6 Making judgements
7 extra on sessions
9 Polymorphism, Dynamic Typing, and Dynamic Binding
10 extra on Variables and knowledge varieties
11 different types and Protocols
12 The Preprocessor
13 Underlying interval gains
half II - the root Framework
14 creation to the basis Framework
15 Numbers, Strings, and Collections
16 operating with records
17 reminiscence administration and automated Reference Counting (ARC)
18 Copying items
Part III - Cocoa, Cocoa contact, and the iOS SDK
20 creation to Cocoa and Cocoa contact
21 Writing iOS purposes
A word list
B deal with booklet software resource Code<p style="margin: 0px;">
Written by way of 3 of the main famous influencers within the Microsoft SharePoint neighborhood, this ebook sheds gentle on SharePoint seek within the company and focuses exclusively on Microsoft seek know-how. This publication is meant for a variety of fogeys from the IT administrator to the developer writing seek functions.
- Lancelot: A Fortran Package for Large-Scale Nonlinear Optimization (Release A)
- Advanced Microsoft Visual Basic 6.0 2nd edition
- CSS: The Definitive Guide (3rd Edition)
- Proceedings of 5th ACM SIGACT-SIGPLAN meeting on programming languages, POPL'78
- Aspects of Semidefinite Programming: Interior Point Algorithms and Selected Applications
- Programming and Computer Techniques in Experimental Physics
Extra resources for Analyzing Computer System Performance with Perl::PDQ
7. RX 10 8 X 6 4 2 RN 0 2 4 6 8 10 X Fig. 7. Apparent independence of throughput and latency for a deterministic (clocked) network Latency and throughput behave as though they are always independent, as long as the objects or packets remain clocked correctly. Notice that under these special circumstances, both the throughput X and the latency R look like straight-line segments. In fact, they look exactly like the dashed lines in 14 1 Why Queues Rule Performance Analysis the southwest corner of the throughput-latency plot in the earlier section on load-test server characteristics.
Instead, the queueing model can be solved for a range of scenarios to gauge what physical sizes are most appropriate for a given application. In other words, we solve the queueing model without any constraints on buffer sizes, and let the queueing model tell us what the optimal buffer sizes ought to be. Finally, although queueing theory may be unfamiliar to you, in some sense it is rather new for all of us. As I write this chapter in 2009, it is the centenary of the seminal queueing theory paper by A.
Unlike much of mathematics, queueing theory is a relatively young science, so in Sect. 7, we provide a short history of buffers. 2 Buffers Are Queues The primary reason for invoking the queueing paradigm is that queues are the correct model of how buffers behave and buffers are a ubiquitous architectural construct in computer systems and applications. J. 1007/978-3-642-22583-3_1, © Springer-Verlag Berlin Heidelberg 2011 3 4 1 Why Queues Rule Performance Analysis All modern computer architectures can be thought of as networks of buffers, and all buffers can be abstracted as queues.