Engineer @dash0hq | prev @PolarSignalsIO, @cockroachdb
Valencia, Spain
- Tweets 479
- Following 366
- Followers 821
- Likes 1,999
Great post. Object storage as the source of truth, batching layer on top of s3 for higher throughput, metadata (WAL) & block layer on object storage. This is all very familiar (very similar to Great Lakes)
This is the architecture of the moment.
We're making Git hosting more reliable, performant, and scalable.
This post traces 20 years of Git infrastructure and explains how that history led us to design and operate our Git storage, Origin, as if it were a database.
cursor.com/blog/git-at-any-s…
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"A relational database scales well with large reference transactions. But then you have to operate a relational database."
Similar to delta lake vs duck lake. One of the main benefits of using object storage is reducing operational complexity. Operating a DB goes against that
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This was a fun one! For @PolarSignalsIO's latest hackathon, I wrote an FSST decompression CUDA kernel and then optimized it by profiling with our new GPU PC sampling feature. 👇
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If you're doing any performance work on GPUs, this is huge. PC sampling is a powerful tool for GPU optimization, but causes serial kernel executions.
We've released production-ready continuous PC sampling so you can get GPU performance insights on your production workloads.
Launching today: GPU PC sampling in production. Instruction-level profiling telling you why and where warps stall. Whether it is memory latency, scoreboard waits, or barriers. 🚀
Previously NSight-only territory. Now running in prod with low overhead.
polarsignals.com/blog/posts/…
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Alfonso Subiotto retweeted
New Blog Alert! Learn how we overcame eBPF limits to unwind deeply nested PyTorch training stacks and learned some cools things along the way:
polarsignals.com/blog/posts/…
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The [F]DAV stack is becoming a thing
We leveraged two amazing open source projects when building SmithDB.
One is @ApacheDataFusio: an extensible Rust based query engine. We built custom execution plans specifically tuned for our workloads and storage backend, and DataFusion made it straightforward to plumb everything together.
The other is @vortexdotdev: an extensible file format that allows you to build custom layouts with specific encoding and chunking strategies for different columns.
I would highly recommend checking out both of these projects if you're interested in modern data systems.
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Alfonso Subiotto retweeted
🤖Using Polar Signals Cloud and Claude Code to autonomously optimize your code every day! 📈
Also: Check out our new website! What do you think?
polarsignals.com/blog/posts/…
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We've been working on a major schema migration at @PolarSignalsIO that has unlocked some pretty wild improvements. Apart from a 50% (!!) reduction in storage size thanks to logical compression in @vortexdotdev, there has been a dramatic improvement in query performance.
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Alfonso Subiotto retweeted
Tired of Node.js flamecharts full of `a`, `m`, and `_0x3f2`? We just shipped source maps support for Node.js profiles in Polar Signals Cloud.
Just add a plugin to your build pipeline, and your profiles show the real code.
Know more: polarsignals.com/blog/posts/…
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Alfonso Subiotto retweeted
Ever wondered how our CPU profiler works, at a hardware and kernel level? Now you can learn more by reading our latest blog post: "Profiling Internals: Hardware Timers and eBPF". Part 2 in the "How Profilers Work" series.
polarsignals.com/blog/posts/…
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I'm happy to share that I will be speaking at #QConLondon on March 16 on deterministic simulation testing at Polar Signals. For anyone interested in attending: SPEAKER60QUK26 for £60 off
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🌪️ The @vortexdotdev Ecosystem:
✅ @linuxfoundation governance
✅ @ApacheDataFusio native
✅ @duckdb core extension (18-35% faster)
✅ @nvidia nvCOMP GPU acceleration
✅ @spice_ai Cayenne (1.4x faster, 1/3 memory usage)
✅ @PolarSignalsIO (70% speedup)
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Alfonso Subiotto retweeted
The @LorimerVentures talent network is a core pillar of our community and we're very proud to have placed dozens of hires into the teams building in our portfolio. It's 2026 - and if you're looking to have a larger impact in your next role - there are 253 open positions across our portfolio. Join one of these amazing teams today!
@MeetGamma (@thisisgrantlee & @thatsjonsense),
@DurableAI (@jamesclift), @secureframe (@shravvmehtaa), @goformic (@samanfarid), @PolarSignalsIO (@fredbrancz), oatfi.com (@MichaelpBarbosa), @northbeam (@MAustinHarrison), @TheDavidEnergy (@James_McGinniss), @UpflowHQ (@AlexLouisy), @moonware_ (@saunonmalek), circuitmind.io (@tomadesanmi), @DatchSystems (@MarkFosdike), @KnapsackCloud (@chrisstrahl), @brijforbrands (@KaitfromBrij), @Capchase (@miguelflarrea), publicinterestco.com (@craigbolz), @PayZenCare (@itzikcoh) and many more!
Click here to see them all! 👉 jobs.lorimerventures.com/job…
DM us your resume with the role you're interested in or feel free to apply directly!
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Alfonso Subiotto retweeted
Fastest embedded db meets fastest columnar file format 🦆🤝🌪️
DuckDB now supports reading from and writing to the Vortex file format! The DuckDB Labs and Spiral teams have worked together to make Vortex available as a core extension in DuckDB.
Vortex is an open source, columnar file format whose design is heavily influenced by recent research in lightweight compression encodings, computing and IO techniques.
We gave it a test drive, and it performed very well. Read the full article to learn more lnkd.in/eZfGzPiZ
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Alfonso Subiotto retweeted
President Ursula von der Leyen officially announced the EU–INC today at Davos!
A single legal entity for all European founders to grow massive companies in Europe. Online incorporation in 48 hours. No more bureaucratic mess across European borders.
All of you made this happen!
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My EuroRust talk has been uploaded to YT! I cover how we architected our Rust database at @PolarSignalsIO as a set of state machines to enable deterministic simulation testing and catch hard-to-reproduce bugs before they hit prod.
A new talk is out! 🙌 @asubiotto shows how deterministic simulation testing (DST) uses random seeds and state machines to explore countless execution paths—and reliably replay failures when things go wrong 🦀🎲
From FoundationDB to Rust systems in production, learn how DST helps catch the nastiest bugs before they ship ✨
👉 piped.video/V12hHoagv-E
#EuroRust #RustConference #RustLang
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