Because it is so easy to setup QZXing in a Qt application, we and most of our customers end up using it when they need to scan images for barcodes. There is, or rather was, a big problem though: When you want to analyze a live camera video stream, e.g. from a phone camera, the latency can …
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In a previous blog post we introduced clazy, a clang plugin which makes the compiler understand Qt semantics, allowing you to get compile-time warnings about Qt best practices ranging from unneeded memory allocations to misuse of API, including fix-its for automatic refactoring.
Today we’ll do a round-up and present the checks related to connect statements, Qt containers (including QString) and misc Qt facilities.
connect() statements still using the old
SLOT() syntax. The Qt …
This blog series will introduce the clang-tidy utility from the Clang/LLVM project and show how to use it to automatically refactor…
I’m extremely happy to finally announce the first stable release of heaptrack, the FOSS heap memory profiler for C/C++ Linux applications. You can download the source tarball from the KDE mirrors: https://download.kde.org/stable/heaptrack/1.0.0/src/
Heaptrack is a fast heap memory profiler that runs on Linux. It allows you to track all heap memory allocations at run-time. Afterwards, the accompanying GUI tool can be used to find optimization opportunities in your code by analyzing the recorded profiling data. It allows you to:
We have released version 2.7 of our Qt application introspection tool GammaRay. GammaRay allows you to observe the behavior and data structures of Qt code inside your program live at runtime.
Here are a few of the highlights of this release:
- The new Qt 3D geometry inspector allows you to look at a wireframe rendering of entity geometries, as well as the raw OpenGL buffer data. Visualizations of normal vectors and backface culling help to identify common problems in geometry
Knowing what tools are at your disposal when looking to make a program faster or keep it operating smoothly is critical to your success as a programmer. We recently solved a performance problem using Linux Kernel Tracepoints so we thought we’d share the process with you so that you can see for yourself if this tool makes sense in your toolkit.
Our challenge: the database writes in a customer’s application normally took under 5ms but occasionally spiked to over 150ms, …
GammaRay is a high-level runtime introspection tool for Qt applications. In this talk we will look at a number of real-world debugging and profiling problems and how the capabilities provided by GammaRay help you with those.
When creating applications we strive to use higher-level frameworks to obtain results quickly and reduce development effort and long-term maintenance cost. This however provides a few challenges during debugging and profiling. With conventional instruction-level tools we have to have a reasonable deep understanding on …
Are you a Qt developer and do you use Linux as your development platform of choice? Then this talk is for you:
I will introduce you to perf, the Linux tool suite for performance analysis. The talk will not only cover a broad part of what perf has to offer, it will also dive into details in how it is applicable to Qt developers in particular. Afterwards, you will know how to use perf to find CPU hotspots in your …
Meet Qt à Lyon.
Rejoignez nos experts Qt pour une journée à Lyon, le 1er Décembre 2016.
Nous serons à l’hôtel Novotel Lyon Part-Dieu avec The Qt Company et Witekio, pour répondre à vos questions et vous montrer quelques-unes de nos démos. Vous verrez GammaRay : l’outil …