How I broke bundler for JRuby

As you might remember from my last blog article, I recently refactored JRuby’s hash tables to use open addressing which improved the performance significantly. While doing so, I broke bundler for JRuby :cry: And as bundler is the most important dependency management tool for the Ruby programming language, this was severe. If you want to know what happened in detail, read on. The issue Yasuo Honda reported in issue #5280 that bundle install of rails... [Read More]

Improve JRuby's hash table performance

The last few weeks I was working on improving JRuby’s hash table implementation. Some of you might remember that with version 2.4, CRuby’s hash table performance improved by around 40% :boom:. Vladimir Makarov achieved this impressive work by implementing open-addressing algorithm. Unfortunately, this change never got implemented in JRuby :cry:. As I was already contributing smaller features over the last year to JRuby I thought it would be time to contribute something bigger. So here... [Read More]

What I learned from contributing to JRuby

Last week, JRuby 9.2.0.0 with Ruby 2.5 support got released :boom:. And with it, some code from me as well. This is what I learned from my contributions. Hash & Set According to the Ruby documentation, a set is a collection of unordered values with no duplicates. In Ruby 2.5, the set class got a reset method which comes handy if you change an object after inserting it to a set. To better understand the... [Read More]

Google Summer of Code 2016

It is getting colder in Germany, so it’s a time to recap Google Summer of Code 2016. This year we had six great students and in August Google announced that all of our students successfully finished their projects. What great news! All good things come to an end This year was especially exciting as we did not make it into GSoC in 2015 and therefore all of our mentors and students worked particularly hard to... [Read More]

Google Summer of Code midterm

In this years edition of Google Summer of Code, an international annual program in which stipends are awarded to students to hack on Free Software during the summer, openSUSE members are mentoring seven students who all passed their mid-term evaluation last week. Go on to read what they have to say about their first 10 weeks in the program. Ana María Martínez Gómez This year, we have three students working on the Open Source Event... [Read More]

Christian Bruckmayer


Christian Bruckmayer from Nuremberg, Germany, is member of the SUSE Build Solutions team. He graduated with a Bachelor of Science in Information Systems from the University of Applied Science Nuremberg. In 2014, he started his Free Software career as student of Henne in the Google Summer of Code. Since then, he is involved in hacking the Rails frontend of the Open Build Service.

If he's not hacking Ruby, he's out doing what young people do: traveling the world :airplane:, skiing in the alps :ski:, going to concerts of his favorite bands :guitar: or visiting Mom & Dad :heart:.

Projects Christian recently contributed to: