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
🤖 Using the Polar Signals MCP just got even easier. Check out how to use it with your favorite AI agent. 🧊
www.polarsignals.com/blog/posts/2...
www.polarsignals.com/blog/posts/2...
Introducing Oauth for AI Agents
Use your favorite AI agent securely with Polar Signals Profiling
www.polarsignals.com
February 12, 2026 at 3:02 PM
🤖 Using the Polar Signals MCP just got even easier. Check out how to use it with your favorite AI agent. 🧊
www.polarsignals.com/blog/posts/2...
www.polarsignals.com/blog/posts/2...
Reposted by Matthias Loibl
Polar Signals at #FOSDEM 2026 day 2!
Both talks in the Rust room.
Profiling Rust applications with Parca
Brennan at 12:30 @ UB2.252A (Rust)
fosdem.org/2026/schedul...
Frederic at 16:00 @ UB2.252A (Rust)
Random seeds and state machines: An approach to DST in Rust
fosdem.org/2026/schedul...
Both talks in the Rust room.
Profiling Rust applications with Parca
Brennan at 12:30 @ UB2.252A (Rust)
fosdem.org/2026/schedul...
Frederic at 16:00 @ UB2.252A (Rust)
Random seeds and state machines: An approach to DST in Rust
fosdem.org/2026/schedul...
February 1, 2026 at 9:00 AM
Polar Signals at #FOSDEM 2026 day 2!
Both talks in the Rust room.
Profiling Rust applications with Parca
Brennan at 12:30 @ UB2.252A (Rust)
fosdem.org/2026/schedul...
Frederic at 16:00 @ UB2.252A (Rust)
Random seeds and state machines: An approach to DST in Rust
fosdem.org/2026/schedul...
Both talks in the Rust room.
Profiling Rust applications with Parca
Brennan at 12:30 @ UB2.252A (Rust)
fosdem.org/2026/schedul...
Frederic at 16:00 @ UB2.252A (Rust)
Random seeds and state machines: An approach to DST in Rust
fosdem.org/2026/schedul...
OCI image support coming to systemd.
I'm getting strong rkt flashbacks. 🥲
I'm getting strong rkt flashbacks. 🥲
January 31, 2026 at 12:08 PM
OCI image support coming to systemd.
I'm getting strong rkt flashbacks. 🥲
I'm getting strong rkt flashbacks. 🥲
Reposted by Matthias Loibl
Polar Signals at #FOSDEM 2026 day 1!
Tommy at 12:30 @ H.1308 (eBPF)
OOMProf: Profiling Go heap memory at OOM time
fosdem.org/2026/schedul...
Thor at 17:25 @ UB2.252A (Databases)
From Disks to Distributed: Our Journey of Database Evolution in the Cloud
fosdem.org/2026/schedul...
Tommy at 12:30 @ H.1308 (eBPF)
OOMProf: Profiling Go heap memory at OOM time
fosdem.org/2026/schedul...
Thor at 17:25 @ UB2.252A (Databases)
From Disks to Distributed: Our Journey of Database Evolution in the Cloud
fosdem.org/2026/schedul...
FOSDEM 2026 - OOMProf: profiling Go heap memory at OOM time
OOMProf is a Go library that installs a eBPF programs that listen to Linux kernel tracepoints involved in OOM killing and records a memory profile before your Go program is dead and gone. The memory…
fosdem.org
January 31, 2026 at 11:49 AM
Polar Signals at #FOSDEM 2026 day 1!
Tommy at 12:30 @ H.1308 (eBPF)
OOMProf: Profiling Go heap memory at OOM time
fosdem.org/2026/schedul...
Thor at 17:25 @ UB2.252A (Databases)
From Disks to Distributed: Our Journey of Database Evolution in the Cloud
fosdem.org/2026/schedul...
Tommy at 12:30 @ H.1308 (eBPF)
OOMProf: Profiling Go heap memory at OOM time
fosdem.org/2026/schedul...
Thor at 17:25 @ UB2.252A (Databases)
From Disks to Distributed: Our Journey of Database Evolution in the Cloud
fosdem.org/2026/schedul...
Unfortunately, I won't be joining #FOSDEM.
I got sick late last week and decided not to contribute to FOSDEM flu and canceled my trip.
Have fun everyone! Next conference!
I got sick late last week and decided not to contribute to FOSDEM flu and canceled my trip.
Have fun everyone! Next conference!
January 30, 2026 at 11:09 AM
Unfortunately, I won't be joining #FOSDEM.
I got sick late last week and decided not to contribute to FOSDEM flu and canceled my trip.
Have fun everyone! Next conference!
I got sick late last week and decided not to contribute to FOSDEM flu and canceled my trip.
Have fun everyone! Next conference!
Let's scale Pyrra even further!
We cut cross-zone traffic for SLO monitoring by 90% using Prometheus subquery optimization.
The trick: pre-aggregate data locally instead of shuffling 55M raw samples to Thanos queriers.
Coming soon to Pyrra! 🚀
www.polarsignals.com/blog/posts/2...
The trick: pre-aggregate data locally instead of shuffling 55M raw samples to Thanos queriers.
Coming soon to Pyrra! 🚀
www.polarsignals.com/blog/posts/2...
Do more with less. | Polar Signals
Polar Signals Cloud is an always-on, zero-instrumentation continuous profiling for CPU, GPU, and Memory that helps improve performance, understand incidents, and lower infrastructure costs.
www.polarsignals.com
December 30, 2025 at 4:10 PM
Let's scale Pyrra even further!
Imagine not having continuous profiling and sleeping on this. Wild.
A simple 50-line code change saves us 30% of CPU across our whole infrastructure. This is the magic of system-wide profiling with @polarsignals.com. Easy to spot, easy to fix.
performance[vortex-array]: don't call is_valid to count bytes in varbinview by asubiotto · Pull Request #5814 · vortex-data/vortex
I noticed that the better blocks compressor uses count_referenced_bytes which calls is_valid on each view and results in an expensive scalar_at call. This was 30% of our system-wide CPU usage over ...
github.com
December 23, 2025 at 11:00 AM
Imagine not having continuous profiling and sleeping on this. Wild.
Reposted by Matthias Loibl
Happy to share that I've been nominated to the Vortex Technical Steering Committee! It's been fun and productive switching to Vortex from Parquet as our storage format @polarsignals.com and I'm excited to continue contributing to the Vortex project.
vortex.dev/blog/novembe...
vortex.dev/blog/novembe...
November Bulletin | Vortex Blog
Overview of all work happening in Vortex
vortex.dev
December 15, 2025 at 3:03 PM
Happy to share that I've been nominated to the Vortex Technical Steering Committee! It's been fun and productive switching to Vortex from Parquet as our storage format @polarsignals.com and I'm excited to continue contributing to the Vortex project.
vortex.dev/blog/novembe...
vortex.dev/blog/novembe...
Reposted by Matthias Loibl
Next.js 16 + turbopack took our frontend builds from 5-7m down to just over 2m. This means faster speed of iteration in development and faster CI.
Performance is UX. Performance is DX. Performance is a feature.
Performance is UX. Performance is DX. Performance is a feature.
December 10, 2025 at 8:07 AM
Next.js 16 + turbopack took our frontend builds from 5-7m down to just over 2m. This means faster speed of iteration in development and faster CI.
Performance is UX. Performance is DX. Performance is a feature.
Performance is UX. Performance is DX. Performance is a feature.
Reposted by Matthias Loibl
Are USDTs the key to unlock the future of low level tracing? Maybe! Read all about how we implemented them and how we plan on using them to breath new life into observability! www.polarsignals.com/blog/posts/2...
USDT Probes: A Deep Dive
How we added USDT Probe support to Parca Agent
www.polarsignals.com
December 10, 2025 at 2:43 PM
Are USDTs the key to unlock the future of low level tracing? Maybe! Read all about how we implemented them and how we plan on using them to breath new life into observability! www.polarsignals.com/blog/posts/2...
Reposted by Matthias Loibl
Standing on the shoulders of giants. We built our new database on open source projects.
🧊 New on the Polar Signals Blog — Our Delta Lake Fork
Purpose-built for our continuous profiling product. In our latest post, we walk through how Delta Lake works, and the changes we've made to improve performance for our product.
👉 Read the full post: buff.ly/KwHINtO
Purpose-built for our continuous profiling product. In our latest post, we walk through how Delta Lake works, and the changes we've made to improve performance for our product.
👉 Read the full post: buff.ly/KwHINtO
Great Lakes: A Delta Lake Fork
Our updates to Delta Lake Table Format
www.polarsignals.com
December 4, 2025 at 2:48 PM
Standing on the shoulders of giants. We built our new database on open source projects.
Reposted by Matthias Loibl
We completed a major project to switch our storage file format from Parquet to Vortex 🌪️ resulting in 70% average query performance improvement across the board 🚀
Learn more about how rethinking interface-imposed limitations unlocked these gains in our latest blog post 👇
Learn more about how rethinking interface-imposed limitations unlocked these gains in our latest blog post 👇
November 25, 2025 at 3:05 PM
We completed a major project to switch our storage file format from Parquet to Vortex 🌪️ resulting in 70% average query performance improvement across the board 🚀
Learn more about how rethinking interface-imposed limitations unlocked these gains in our latest blog post 👇
Learn more about how rethinking interface-imposed limitations unlocked these gains in our latest blog post 👇
"Stell dir vor du installierst nix."
Germans talking about installing NixOS is very funny. 😀
Germans talking about installing NixOS is very funny. 😀
November 21, 2025 at 10:26 PM
"Stell dir vor du installierst nix."
Germans talking about installing NixOS is very funny. 😀
Germans talking about installing NixOS is very funny. 😀
Reposted by Matthias Loibl
Ever wanted to filter flame graphs by distributed trace ID? Or by anything else? In Node.js, now you can! www.polarsignals.com/blog/posts/2...
Happy Profiling! 🚀🐻❄️
Happy Profiling! 🚀🐻❄️
Custom Labels for Node.js
Correlate Application-Specific Data With Profiles
www.polarsignals.com
November 19, 2025 at 4:58 PM
Ever wanted to filter flame graphs by distributed trace ID? Or by anything else? In Node.js, now you can! www.polarsignals.com/blog/posts/2...
Happy Profiling! 🚀🐻❄️
Happy Profiling! 🚀🐻❄️
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!