As of a couple days ago Filelight on Windows is performing its search many times faster than before. Go check it out!

https://apps.kde.org/filelight/

This week Plasma developers have descended on the lovely Austrian city of Graz! 🍦

A while ago a colleague of mine asked about our crash infrastructure in Plasma and whether I could give some overview on it. This seems very useful to others as well, I thought. Here I am, telling you all about it!

Our crash infrastructure is comprised of a number of different components.

• KCrash: a KDE Framework performing crash interception and prepartion for handover to…
• coredumpd: a systemd component performing process core collection and handover to…
• DrKonqi: a GUI for crashes sending data to…
• Sentry: a web service and UI for tracing and presenting crashes for developers

We already looked at KCrash, coredumpd, and DrKonqi. This week it’s time to look at the final piece of the puzzle — Sentry.

A while ago a colleague of mine asked about our crash infrastructure in Plasma and whether I could give some overview on it. This seems very useful to others as well, I thought. Here I am, telling you all about it!

Our crash infrastructure is comprised of a number of different components.

• KCrash: a KDE Framework performing crash interception and prepartion for handover to…
• coredumpd: a systemd component performing process core collection and handover to…
• DrKonqi: a GUI for crashes sending data to…
• Sentry: a web service and UI for tracing and presenting crashes for developers

We’ve already looked at KCrash and coredumpd. Now it is time to look at DrKonqi.

A while ago a colleague of mine asked about our crash infrastructure in Plasma and whether I could give some overview on it. This seems very useful to others as well, I thought. Here I am, telling you all about it!

Our crash infrastructure is comprised of a number of different components.

• KCrash: a KDE Framework performing crash interception and prepartion for handover to…
• coredumpd: a systemd component performing process core collection and handover to…
• DrKonqi: a GUI for crashes sending data to…
• Sentry: a web service and UI for tracing and presenting crashes for developers

We’ve looked at KCrash previously. This time we look at coredumpd.

A while ago a colleague of mine asked about our crash infrastructure in Plasma and whether I could give some overview on it. This seems very useful to others as well, I thought. Here I am, telling you all about it!

Our crash infrastructure is comprised of a number of different components.

• KCrash: a KDE Framework performing crash interception and prepartion for handover to…
• coredumpd: a systemd component performing process core collection and handover to…
• DrKonqi: a GUI for crashes sending data to…
• Sentry: a web service and UI for tracing and presenting crashes for developers

We will look at them in turn. This post introduces KCrash.

The other day I had to dive into the ksmserver code, the core of session management in KDE Plasma, but found it all a bit difficult to read. If only I could get a callgraph I thought…

Turns out it actually is possible!

In fact it is almost too easy with clang/llvm. There are already solutions that attach LLVM bitcode to existing binaries. e.g. gllvm. gllvm basically is a shim sitting between ninja and the actual compiler and injects some behavior for us. This enables the use without having to refit anything in our existing code. You might note that clazy, our most excellent code analyzer, works in a similar fashion.

For a while now DrKonqi has a special developer notification system when used in combination with coredumpd. I just realized I never told anyone about it 😅 though.

It’s terribly simple: When used with coredumpd, parts of DrKonqi implicitly look at all crashes that pertain to your current user. Because of that it can also notify on all crashes, not just the KDE-related ones. Obviously it can’t report bugs or anything but sometimes, as a developer, it’s nice to know when things explode.

The other week the question came up how one can debug an application crash when the Windows Store crash tracking system is unable to produce a usable stack trace. Seemed a good enough opportunity to share some wisdom :)

Generally speaking in order to get a stack trace you first need a minidump. minidumps are kind of like core dumps on POSIX systems, well, except, mini. Acquiring that is should be your first goal.

…very hard.

KDE relies heavily on web services, and many of them need to be kept responsive even under strenuous load. I’ve recently had the opportunity to spend some time on load testing one of our websites and would like to share how that worked out.

To properly test things I wanted to have multiple computers make concurrent requests to the service and ensure that the service still performs within acceptable limits. To that end I needed a bunch of servers, software that can pressure the web service, and software that can make sure the service works.