Book Image

Hands-On High Performance Programming with Qt 5

By : Marek Krajewski
5 (1)
Book Image

Hands-On High Performance Programming with Qt 5

5 (1)
By: Marek Krajewski

Overview of this book

Achieving efficient code through performance tuning is one of the key challenges faced by many programmers. This book looks at Qt programming from a performance perspective. You'll explore the performance problems encountered when using the Qt framework and means and ways to resolve them and optimize performance. The book highlights performance improvements and new features released in Qt 5.9, Qt 5.11, and 5.12 (LTE). You'll master general computer performance best practices and tools, which can help you identify the reasons behind low performance, and the most common performance pitfalls experienced when using the Qt framework. In the following chapters, you’ll explore multithreading and asynchronous programming with C++ and Qt and learn the importance and efficient use of data structures. You'll also get the opportunity to work through techniques such as memory management and design guidelines, which are essential to improve application performance. Comprehensive sections that cover all these concepts will prepare you for gaining hands-on experience of some of Qt's most exciting application fields - the mobile and embedded development domains. By the end of this book, you'll be ready to build Qt applications that are more efficient, concurrent, and performance-oriented in nature
Table of Contents (14 chapters)

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...