Massif is a really nifty tool which is very powerful, especially paired with my visualizer. The caveat of course is that it slows down the application considerably, I’ve seen anything up to a factor of 100… I see no alternative to Massif when it comes to investigating where your memory problems come from. But if you just want to see whether you have a problem at all, tracking the total memory consumption should suffice.
A few days ago, I came across pmap on Stack Overflow, which makes it easy to track the RSS memory consumption of an application using the -x switch. Of course I had to write some bash magic to automate this process and visualize the data using Gnuplot! Behold:
memory consumption of a PhantomJS script over ~30min
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Hey all,
following the recent blog post on getting a forum for KDE software I decided to get one setup for KDevelop. Minutes after, it was all done, we now have a KDevelop Forum. Feel free to use it for discussions and user support around KDevelop and related applications. Development discussions etc. will still happen on our mailing list though.
To get the forum rolling, I’ve had the idea to use it for some crowdsourcing of KDevelop screenshots, see also the post on the KDevelop website: http://kdevelop.org/community/new-forum-screenshots .
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Hey all!
Please help us test KDevelop 4.3 RC1! Grab it while it’s hot: http://kdevelop.org/43/kdevelop-430-rc-1-released
This release comes with some more bug fixes and better support for some C++11 language features.
Cheers!
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Hey all!
I’ve just posted the news on the KDevelop website: KDevelop 4.3.0 Beta 2 is released!
Please test it and report feedback as usual. I think it’s safe to assume that we will release 4.3.0 final in about 2-4 weeks from now.
Considering that my university semester is nearing its end, I will finally have more royal hacking time again! I’ll continue to squash bugs and improve the performance of KDevelop of course :) Most definitely I’ll try to further improve the C++11 support. But maybe I finally have some time again to work on “something bigger”, like helping Miha Čančula in writing a kick-ass unit-test integration for KDevelop (see unittest branches). Then I plan to finally release some more of our “playground” plugins, most notably CSS language support and QMake project management…
Stay tuned for a bright KDevelop future :]
PS: I’ll step up as a mentor for a KDevelop GSOC this year, yet I’m still wondering about a proper topic… Ideas?
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Hey all!
I’m happy to announce the release of Massif-Visualizer 0.3. You can download the sources here:
http://download.kde.org/download.php?url=stable/massif-visualizer/0.3/src
Highlights of this release:
- translations into 18 different languages
- basic support for hiding of functions via context menu
- basic support for custom allocators
- configurable precision of memory consumption display
- various optimizations, bug fixes and other improvements. take a look at the changelog for more information
Future Development
It took me much too long to get this release out and hope to do better in the future. Current git master already contains some new patches - try it out! I especially like the improved display of the callgraph which now aggregates the tails of the callgraph tree, i.e. the end of the backtrace which mostly starts main() etc.
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Let’s assume you want to display the logo of your company in your Qt app. Most probably that logo has just single color with an alpha channel.But: Having the color hard coded in the image is not nice, there are users (like me!) out there, who use a custom (dark!) color scheme. Meaning: If your logo is black/dark and assumes a bright background and you just embed it blindly in your app, I probably won’t see it since the background will be dark in my case.
Here is a solution for the simple case of a mono-colored PNG with an alpha channel which I came up with:
QLabel* label = new QLabel;
// load your image
QImage img(QString("..."));
// morph it into a grayscale image
img = img.alphaChannel();
// the new color we want the logo to have
QColor foreground = label->palette().foreground().color();
// now replace the colors in the image
for(int i = 0; i < img.colorCount(); ++i) {
foreground.setAlpha(qGray(img.color(i)));
img.setColor(i, foreground.rgba());
}
// display the new logo
label->setPixmap(QPixmap::fromImage(img));
label->show();
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Hey all,
been some time since I blogged last time. My TODO list is ever increasing and I took my day job at KDAB up again. Among others, I attended a marketing talk by Edmund Preiss. He actually made that marketing talk interesting, not least by his huge knowledge in the business, thanks to ~20 years of working for Intel. Probably the most important info I got out of it is this:
VTune is available free-of-charge under a non-commercial license
Yes, you heard right. Take these links:
note this entry from the FAQ:
What does noncommercial mean?
Non-commercial means that you are not getting compensated in any form for the products and/or services you develop using these Intel® Software Products.
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Hey all,
I finally want to write a bit about my work on KDevelop during this year’s GSOC. To make things a bit more interesting for the whole crowd, even for those heretics that don’t use KDevelop, I want to highlight some C++2011 features I got to know in the process. Hence this multipart blog post should be interesting for all KDE hackers, as eventually we will be able to use these shiny new features of what is to be known as C++2011.
For those interested in the full overview of changes in C++2011, take a look at e.g. the C++0x Status Page in GCC 4.6, the wikipedia article on C++0x, or try to get hold of a copy of the C++2011 FDIS spec file. Note that the latter is apparently not freely accessible, see also this stackoverflow discussion. Still, maybe you find someone who can send you a copy…
So, lets get down to business. Following is a not-complete list of C++2011 features I’ve already implemented in KDevelop. If I mess something up in explaining a new feature, or if I forget an important aspect, please add a comment.
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Hey all!
I wanted to quickly notify you all about the availability of KDevelop 4.2.3, you can download it here:
http://download.kde.org/download.php?url=stable/kdevelop/4.2.3/src/
Most people should be fine with waiting for updated packages from their distributor though.
To read the full release notes and take a look at the changelog, please visit the project website:
http://kdevelop.org/kdevelop/kdevelop-423-released
Many thanks to the contributors, for making this release possible
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Yawn. Hello everyone!
After two nights of backporting sleep in my RL branch to fix the deficiency I built up during Randa, I feel somewhat normal again. Time to blog, eh?
Randa
Lets begin with Randa. It was not only my first time there, but also my first time ever to be in the Swiss Alps. And furthermore it was the first time for me to be in the Alps without crying out loud about the lack of snow as I didn’t intend to go snowboarding. You can imagine it was a very pleasant experience for me. I definitely want to come back to go on some more serious hiking trips uphill. But I diverge ;-)
Randa as place for a sprint was simply awesome: Secluded hence no real distractions. Great environment to clean your head, get fresh air and stay focused and productive. Good food, nice people, … I could go on here :) The only negative things I noticed where the unstable networking and the dormitories.
KDevelop Sprint
The KDevelop sprint at Randa was very successful and productive. Here is a group picture of those who attended:
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