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Hands-On High Performance Programming with Qt 5

You're reading from   Hands-On High Performance Programming with Qt 5 Build cross-platform applications using concurrency, parallel programming, and memory management

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Product type Paperback
Published in Jan 2019
Publisher Packt
ISBN-13 9781789531244
Length 384 pages
Edition 1st Edition
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Author (1):
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Marek Krajewski Marek Krajewski
Author Profile Icon Marek Krajewski
Marek Krajewski
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Table of Contents (14) Chapters Close

Preface 1. Understanding Performant Programs 2. Profiling to Find Bottlenecks FREE CHAPTER 3. Deep Dive into C++ and Performance 4. Using Data Structures and Algorithms Efficiently 5. An In-Depth Guide to Concurrency and Multithreading 6. Performance Failures and How to Overcome Them 7. Understanding I/O Performance and Overcoming Related Problems 8. Optimizing Graphical Performance 9. Optimizing Network Performance 10. Qt Performance on Embedded and Mobile Platforms 11. Testing and Deploying Qt Applications 12. Assessments 13. Other Books You May Enjoy

Chapter 9

  1. If, in the UDP protocol, there is no guarantee that the packet will arrive at the destination, why are we bothering with it at all?
    Believe it or not, in some contexts, this is an acceptable trade-off. For example, in the VoIP (Voice-over IP) context, dropping one or two packets of the conversation is usually OK, and a price we are glad to pay for improved latency!
  1. How can we enable a network cache in Qt? What will get cached there?
    We can use QNetworkAccessManager::setCache() to enable it. This will cache HTTP contents (such as the HTML page, JSON data, and so on) that we get from the network.
  2. What is an IP protocol?
    An IP protocol sends data from IP address X to an I/O address Y, and thus has to find a way to reach Y starting from X. A UDP does not do much more than this, but additionally multiplexes data for several ports on X and Y.
  3. Is there a Qt cache for DNS...
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