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Débogage et profilage d’applications Qt sous Linux

La formation “Débogage et profilage d’applications Qt sous Linux” enseigne les techniques de débogage et profilage d’applications sous Linux.

Elle est en particulier (mais pas seulement) appropriée pour les applications utilisant la technologie objet Qt/C++.

A l’issue de la formation, les participants seront capables d’appliquer leur nouveau savoir-faire pour la recherche et la résolution de problèmes dans leurs applications Qt sous Linux, qu’il s’agisse de dysfonctionnements ou de problèmes de performance.

Prérequis

Une expérience professionnelle de la programmation en Qt …

28.02.2017 10 comments

Heaptrack v1.0.0 Release First stable release of the fast Linux heap memory profiler

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:

  • Inspect
…

28.02.2017 and One comment

Slaying Latency with Linux Kernel Tracepoints

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, …

08.12.2016 No comments

GammaRay: Taking a deep look into your Qt application Volker Krause

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 …

03.12.2015 No comments

What is GammaRay? – 3 reasons to start using it today

What is GammaRay? 

For starters, it’s a powerful electromagnetic wave, as well as a way to treat cancer. It’s also an under-appreciated German speed metal band. And it’s what gives Dr. Bruce Banner his big green alter ego. But Qt aficionados will know the GammaRay that we’re talking about is an uber-powerful Qt debugger and introspection tool. If you’re not using it already, read on to find out why it should be part of your go-to toolkit. 

Fig 0.

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07.09.2015 31 comments

How to use static analysis to improve performance

It’s usually said “only improve performance where a profiler tells you to“. I don’t completely agree.

  • Take a big C++ library like Qt: can you profile all classes and all code paths ? It would take a couple of years to accomplish and analyse the results.
  • It’s expensive: It usually only happens if the speed-up is big enough to justify the needed skilled developer time. Customers don’t pay for a 10% speed gain for a desktop application. Even
…

01.07.2014 and 4 comments

Analysing QtQuick apps with GammaRay or “Why is my button gone?”

This is a typical situation when you program a GUI for an application. You have just created a new control, you start your application and… no control. But now: Is it obscured? Is it misplaced? Is it completely transparent or set to ‘invisible’? Is my custom OpenGL-stuff broken or is the item actually not created for some reason? Checking all these cases manually can be a time-consuming and exhausting task.

“Come on, it’s got to be easier than this!”

In …

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