Matthias Loibl
@metalmatze.de
Director of @PolarSignals.com Cloud. Building cool products! 🧊 Maintainer of Parca, Pyrra, @Prometheus.io, PromOperator and more. PromCon organizer. @cncf.io Ambassador.
Reposted by Matthias Loibl
Was digging into JS source maps recently and had a lot of fun writing this post, especially the interactive bits. 🤓
Ever wondered how your browser devtools jumps from bundle.min.js:1:27698 → src/index.ts:73:16? 🧊
We unpack the internals of JS Source Maps: Base64 VLQ encoding, mapping deltas, and how your original TS code gets reconstructed from minified bundles.
🔗 www.polarsignals.com/blog/posts/2...
We unpack the internals of JS Source Maps: Base64 VLQ encoding, mapping deltas, and how your original TS code gets reconstructed from minified bundles.
🔗 www.polarsignals.com/blog/posts/2...
The Inner Workings of JavaScript Source Maps
A deep dive into how JavaScript source maps work under the hood, with examples showing how all the pieces fit together.
www.polarsignals.com
November 4, 2025 at 3:15 PM
Was digging into JS source maps recently and had a lot of fun writing this post, especially the interactive bits. 🤓
Reposted by Matthias Loibl
We made a bit of a dumb thing early on at Polar Signals where we accidentally created a critical GCS bucket as multi-region. But today I learned about Bucket relocation (launched in 2024). Very timely! docs.cloud.google.com/storage/docs...
Bucket relocation | Cloud Storage | Google Cloud Documentation
This document describes the Cloud Storage bucket relocation service that relocates buckets serverlessly between geographic locations. Using bucket relocation, you can move an existing bucket from one…
docs.cloud.google.com
October 31, 2025 at 2:52 PM
We made a bit of a dumb thing early on at Polar Signals where we accidentally created a critical GCS bucket as multi-region. But today I learned about Bucket relocation (launched in 2024). Very timely! docs.cloud.google.com/storage/docs...
Time has come to rewatch Mr. Robot. 🖤
a man on a subway train with the words do you want to watch mr robot
ALT: a man on a subway train with the words do you want to watch mr robot
media.tenor.com
October 27, 2025 at 8:04 PM
Time has come to rewatch Mr. Robot. 🖤
Previously, we've correlated GPU metrics with CPU profiles, now we can actually show you GPU time!
This is suuuuuper exciting! 🚀
This is suuuuuper exciting! 🚀
🚀 We're super excited to launch NVIDIA CUDA Profiling today! Check out the blog on how we made it happen! 🧊
www.polarsignals.com/blog/posts/2...
www.polarsignals.com/blog/posts/2...
Continuous NVIDIA CUDA Profiling In Production
Low-Overhead Profiling of GPUs with USDT Probes and eBPF
www.polarsignals.com
October 22, 2025 at 2:49 PM
Previously, we've correlated GPU metrics with CPU profiles, now we can actually show you GPU time!
This is suuuuuper exciting! 🚀
This is suuuuuper exciting! 🚀
Pyrra v0.9 is here! 🎉
github.com/pyrra-dev/py...
It's incredible to see the amount of diverse contributions to the project!
I didn't even realize it was that way until the release was published! Incredible to see!
Thank you, everyone!
github.com/pyrra-dev/py...
It's incredible to see the amount of diverse contributions to the project!
I didn't even realize it was that way until the release was published! Incredible to see!
Thank you, everyone!
October 22, 2025 at 11:17 AM
Pyrra v0.9 is here! 🎉
github.com/pyrra-dev/py...
It's incredible to see the amount of diverse contributions to the project!
I didn't even realize it was that way until the release was published! Incredible to see!
Thank you, everyone!
github.com/pyrra-dev/py...
It's incredible to see the amount of diverse contributions to the project!
I didn't even realize it was that way until the release was published! Incredible to see!
Thank you, everyone!
Native Histogram considered stable in @Prometheus.io going forward! 🥳
Props to all the people who worked on this for years!
Props to all the people who worked on this for years!
October 21, 2025 at 3:15 PM
Native Histogram considered stable in @Prometheus.io going forward! 🥳
Props to all the people who worked on this for years!
Props to all the people who worked on this for years!
BER 🚄 MUC
Oh my way to #PromCon!
Excited to meet with the @prometheus.io community again!
See you tomorrow!
Oh my way to #PromCon!
Excited to meet with the @prometheus.io community again!
See you tomorrow!
October 20, 2025 at 10:46 AM
BER 🚄 MUC
Oh my way to #PromCon!
Excited to meet with the @prometheus.io community again!
See you tomorrow!
Oh my way to #PromCon!
Excited to meet with the @prometheus.io community again!
See you tomorrow!
Reposted by Matthias Loibl
Took advantage of the lunch break to replay this great talk by Alfonso Subiotto (@asubiotto.com) making the case for a State Machines based approach to Deterministic Simulation Testing, being used at @polarsignals.com, very interesting!
Their inspiration for this: sled.rs/simulation
Their inspiration for this: sled.rs/simulation
October 10, 2025 at 11:23 AM
Took advantage of the lunch break to replay this great talk by Alfonso Subiotto (@asubiotto.com) making the case for a State Machines based approach to Deterministic Simulation Testing, being used at @polarsignals.com, very interesting!
Their inspiration for this: sled.rs/simulation
Their inspiration for this: sled.rs/simulation
Reposted by Matthias Loibl
It's amazing to see a packed room for the talk of our very own @asubiotto.com, who is talking about Deterministic Simulation Testing at @eurorust.eu right now! 🦀 ⌛
October 10, 2025 at 9:19 AM
It's amazing to see a packed room for the talk of our very own @asubiotto.com, who is talking about Deterministic Simulation Testing at @eurorust.eu right now! 🦀 ⌛
Reposted by Matthias Loibl
We're having a blast at @eurorust.eu today! 🦀
Come by to talk about all things performance and continuous profiling!
Come by to talk about all things performance and continuous profiling!
October 9, 2025 at 2:47 PM
We're having a blast at @eurorust.eu today! 🦀
Come by to talk about all things performance and continuous profiling!
Come by to talk about all things performance and continuous profiling!
So cool and parca.dev getting mentioned out of nowhere. Love to see it!
New tooling for profiling performance-critical services with Swift -- introducing the Swift Profile Recorder. More here: www.swift.org/blog/swift-p...
October 8, 2025 at 7:54 AM
So cool and parca.dev getting mentioned out of nowhere. Love to see it!
Amsterdam. The only major airport where the pilots join you for the same bus ride.
September 28, 2025 at 8:33 PM
Amsterdam. The only major airport where the pilots join you for the same bus ride.
Reposted by Matthias Loibl
Reposted by Matthias Loibl
Working from the @polarsignals.com office today
September 24, 2025 at 12:27 PM
Working from the @polarsignals.com office today
Reposted by Matthias Loibl
FINALLY Spotify getting it together. Been following that forum thread literally for YEARS.
September 11, 2025 at 5:59 PM
FINALLY Spotify getting it together. Been following that forum thread literally for YEARS.
Heartbreaking.
Han was amazing!
Han was amazing!
my friend han passed away earlier this week www.legacy.com/us/obituarie...
Han Kang Obituary (1983 - 2025) - Legacy Remembers
View Han Samuel Kang's obituary, send flowers and sign the guestbook.
www.legacy.com
September 8, 2025 at 9:47 AM
Heartbreaking.
Han was amazing!
Han was amazing!
Reposted by Matthias Loibl
We recently made some performance improvements to our Flame Graph by implementing backend pre-computation and viewport culling. Read more in our latest blog post: www.polarsignals.com/blog/posts/2...
Parallel Flame Graph Rendering
How we improved our flame graph rendering by moving computation to the backend.
www.polarsignals.com
September 3, 2025 at 2:39 PM
We recently made some performance improvements to our Flame Graph by implementing backend pre-computation and viewport culling. Read more in our latest blog post: www.polarsignals.com/blog/posts/2...
What are some good Ubiquiti Unifi AP alternatives people go for these days when buying Wi-Fi 6/7 APs?
September 3, 2025 at 7:13 AM
What are some good Ubiquiti Unifi AP alternatives people go for these days when buying Wi-Fi 6/7 APs?
Reposted by Matthias Loibl
I wrote about why we should treat German string encoding/StringViews as Just Another Encoding™
German strings 🇩🇪 have become very popular in the database world. However, they're not a silver bullet. Read more in our latest blog post:
Das Problem mit German Strings
And why I don't want my database to choose the best encoding for me (yet)
www.polarsignals.com
August 26, 2025 at 4:00 PM
I wrote about why we should treat German string encoding/StringViews as Just Another Encoding™
Remember Epic Meal Time?
I feel old.
I feel old.
August 26, 2025 at 9:15 AM
Remember Epic Meal Time?
I feel old.
I feel old.
New Pendulum album. Yay!
August 21, 2025 at 10:10 PM
New Pendulum album. Yay!
Reposted by Matthias Loibl
Tomorrow, the premiere of this year's Lightning Talks at Systems Distributed!
Hosted by @nvais.bsky.social, five speakers selected on Day 1 took to the stage on Day 2, in a race against the gong...
Join them on YT tomorrow, 10am PT / 1pm ET / 7pm CET
youtube.com/watch?v=k58v...
Hosted by @nvais.bsky.social, five speakers selected on Day 1 took to the stage on Day 2, in a race against the gong...
Join them on YT tomorrow, 10am PT / 1pm ET / 7pm CET
youtube.com/watch?v=k58v...
August 19, 2025 at 8:24 PM
Tomorrow, the premiere of this year's Lightning Talks at Systems Distributed!
Hosted by @nvais.bsky.social, five speakers selected on Day 1 took to the stage on Day 2, in a race against the gong...
Join them on YT tomorrow, 10am PT / 1pm ET / 7pm CET
youtube.com/watch?v=k58v...
Hosted by @nvais.bsky.social, five speakers selected on Day 1 took to the stage on Day 2, in a race against the gong...
Join them on YT tomorrow, 10am PT / 1pm ET / 7pm CET
youtube.com/watch?v=k58v...
Reposted by Matthias Loibl
Ok, I have a rant I have to let go of.
If you generate a change to an open-source project fully with AI, didn't read, review, understand, and questioned it, then at least have the decency to say this on the PR description.
You're stealing people's time by making them review it for you.
If you generate a change to an open-source project fully with AI, didn't read, review, understand, and questioned it, then at least have the decency to say this on the PR description.
You're stealing people's time by making them review it for you.
August 16, 2025 at 11:23 AM
Ok, I have a rant I have to let go of.
If you generate a change to an open-source project fully with AI, didn't read, review, understand, and questioned it, then at least have the decency to say this on the PR description.
You're stealing people's time by making them review it for you.
If you generate a change to an open-source project fully with AI, didn't read, review, understand, and questioned it, then at least have the decency to say this on the PR description.
You're stealing people's time by making them review it for you.