128 lines
5.6 KiB
Markdown
128 lines
5.6 KiB
Markdown
---
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title: "Talks"
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description: "Motiejus Jakštys on stage"
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---
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2025-09-11 DevOpsDays Vilnius
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**The Filesystem Diaries: Scaling Btrfs in an Enterprise**
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Btrfs was merged into the Linux kernel in 2009, arriving with bold
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promises—and, let's be honest, a reputation for instability. I first tried it
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on my laptop in 2011. It wiped my data. Twice. On the bright side, it taught me
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the value of backups.
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Fast forward to 2025: btrfs is no longer the experimental filesystem of the
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past. It's stable, mature, feature-rich, and fully part of the Linux kernel.
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But old reputations die hard. Even today, Google Cloud Platform doesn’t
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officially support it—not because of technical shortcomings, but because
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customer demand hasn’t pushed the issue.
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At Chronosphere, we decided to take a fresh look. After months of evaluation
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and testing, we migrated petabytes of customer data across thousands of disks
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to btrfs. This talk is our story: why we made the leap, what we learned along
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the way, and how we’re helping bring btrfs into wider enterprise
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adoption—including working with Google to support it natively.
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I'll share the decision-making process, key performance and reliability
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insights, and the quirks you only discover when running btrfs at scale. Whether
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you're btrfs-curious or just love a good ops tale, you'll walk away with
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real-world takeaways—and maybe a newfound respect for this once-maligned
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filesystem.
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If you know what NTFS, ext4, or ZFS are, you’re ready for this journey.
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No video, no slides.
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<hr/>
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2024-05-17 Zig Milan Party
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--------------------------
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**Maps and Yellow Pages**
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If you look back 10-15 years, we used “free maps” only as a last-resort way to
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find a tourism information office or shop that sells real maps. It also used to
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be funny and, in a way, interesting, to navigate “map-flavored yellow pages”.
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We knew we are looking at an ad brochure and acted accordingly.
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These days map-flavored Yellow Pages are embedded into every smartphone, which
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we use daily to navigate. I find it quite sad, because constantly projecting
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the world through such “maps” results in a very peculiar world understanding.
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For those who haven’t tried, it is an interesting exercise to use Yellow Pages
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to find playgrounds (when traveling with kids) or water fountains during hot
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days.
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Even in this era, not all is lost! Technology of real maps is moving and
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improving. I will remind you what a real map looks like and show how usable it
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is today. During the talk a licensed cartographer will give practical
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day-to-day tips for navigation and exploration. In the second half of the talk
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we will switch out our consumer hat to a creator hat and behold, create! No
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background in cartography required, only a smartphone.
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* [Slides](/talks/2024-sycl-maps-and-yellow-pages.pdf).
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* Video: [webm](/talks/2024-sycl-maps-and-yellow-pages.webm), [mkv](/talks/2024-sycl-maps-and-yellow-pages.mkv), [youtube](https://www.youtube.com/watch?v=I7fFBJHmCT0)
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<hr/>
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2022-04-10 Zig Milan Party
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--------------------------
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**How Zig is Used at Uber**
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TLDR from the [blog post]({{<ref "log/2022/how-uber-uses-zig" >}}):
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* Uber uses Zig to compile its C/C++ code. Now only in the [Go
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Monorepo][go-monorepo] via [bazel-zig-cc][bazel-zig-cc], with plans to
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possibly expand use of `zig cc` to other languages that need a C/C++
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toolchain.
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* Main selling points of C/C++ toolchain on top of zig-cc over the
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alternatives: configurable versions of glibc and macOS cross-compilation.
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* Uber does not have any plans to use zig-the-language yet.
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* Uber signed a support agreement with Zig Software Foundation (ZSF) to
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prioritize bug fixes. The contract value is disclosed in the ZSF financial
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reports.
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* Thanks to my team, the Go Monorepo team, the Go Platform team, my director,
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finance, legal, and of course Zig Software Foundation for making this
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relationship happen. The relationship has been fruitful so far.
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Presentation:
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* [Blog post]({{<ref "log/2022/how-uber-uses-zig" >}}).
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* [Slides](/talks/2022-zig-milan-party_How-zig-is-used-at-Uber.pdf).
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* Video: [webm](/talks/2022-zig-milan-party_How-zig-is-used-at-Uber.webm), [mkv](/talks/2022-zig-milan-party_How-zig-is-used-at-Uber.mkv), [youtube](https://www.youtube.com/watch?v=SCj2J3HcEfc).
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<hr/>
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2016-11-18 Build Stuff Vilnius
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------------------------------
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**Understanding and building your own Docker**
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Docker started small and got big in really short time. Believe it or not, you
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can learn to build your version of it too, within the duration of a conference
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talk!
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In the talk, we will assemble and run a Docker-like container with only
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standard command-line tools found in modern Linux distributions.
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First half of the presentation will cover the facilities Linux provides for
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Docker to build upon: cgroups, pid and network namespaces, overlay file
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systems. During the second half we will put theory to practice in a terminal
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session. At the end of the talk we will not only be armed with knowledge how to
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build an isolated container, but also have an actual container running.
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After the talk, you will have a good insight how Docker works, and understand
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how you could use its building blocks to build something that perfectly matches
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your environment.
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You’ll get most out of this session if you are comfortable in Linux terminal,
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for instance, configuring networking from command-line. Knowledge about Pid
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namespaces, cgroups or overlay filesystems is not required. You will learn it
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all that during the talk.
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* [Slides](/talks/2016-buildstuff-understanding-building-your-own-docker.pdf).
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* Video: [mkv](/talks/2016-buildstuff-understanding-building-your-own-docker.mkv), [youtube](https://www.youtube.com/watch?v=vYZKxVkUMvQ).
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