💪 Monday motivation: We are officially one month away from #P99CONF. eBPF has always been a popular topic, and this year is no exception. Don't miss @tanelpoder.com, @ddelnano.bsky.social, Jake Hillion, and @mostlynerdless.de on October 22-23: www.p99conf.io?latest_sfdc_... #ScyllaDB

Two years ago I published a "book" on intro Python programming and host it free of charge at pyflo.net I occasionally get email like this. It's wonderful to know all those efforts are helping learners around the world.

If you have eBPF "biolatency" style IO latency monitoring tools always-on, you might want to reduce its tracepoint CPU overhead by not storing IO start times in a shared hashtable at all. In my results, 59x lower tracepoint CPU overhead at 37M IOPS 😎 tanelpoder.com/posts/optimi...

If you have eBPF "biolatency" style IO latency monitoring tools always-on, you might want to reduce its tracepoint CPU overhead by not storing IO start times in a shared hashtable at all. In my results, 59x lower tracepoint CPU overhead at 37M IOPS 😎 tanelpoder.com/posts/optimi...

Last week to apply for the first eBPF Foundation Community & Advocacy Fellowship program! If the last decade was about building the technology, this is about building the community that will take eBPF forward. Open until Friday!

Already getting good questions about 0x.tools in YouTube!

Interesting. QEMU 10.1 supports WASM and can run inside a browser. 🤔 wiki.qemu.org/ChangeLog/10.1

The xCapture and xtop eBPF tools are now in beta, with a demo dataset! With a pre-recorded xcapture dataset from my dev server, now you can play with xtop "thread activity sampling" drilldown even on your laptop, without having to run xcapture yourself! (link in replies :-)

The xCapture and xtop eBPF tools are now in beta, with a demo dataset! With a pre-recorded xcapture dataset from my dev server, now you can play with xtop "thread activity sampling" drilldown even on your laptop, without having to run xcapture yourself! (link in replies :-)

Excited to announce that @ganeumann.bsky.social will join @ahl.bsky.social and me on the podcast tomorrow to reflect on his 2015 piece -- and what it might portend about current technological frenzies. Join us, Monday, 5p Pacific! discord.gg/QrcKGTTPrF?e...

One of the coolest tech + data talks I've ever seen. If you like hardware, high performance data and ML check it out :-) www.youtube.com/watch?v=T8HT...

Something for Linux block I/O nerds - Linux Storage Stack Diagram (up to kernel v6.16) published: www.thomas-krenn.com/en/wiki/Linu...

Something for Linux block I/O nerds - Linux Storage Stack Diagram (up to kernel v6.16) published: www.thomas-krenn.com/en/wiki/Linu...

Some notes on the insecurity baked into Perplexity's Comet "AI Browser" - the Brave security team reported serious prompt injection vulnerabilities in it, but Brave themselves are developing a similar feature that looks doomed to have similar problems simonwillison.net/2025/Aug/25/...

I have published the CatVector embedding-vector heatmap visualization app (for learning and fun!) as a static webpage now (just browser is enough, no downloads or Python needed). And now we have dark mode too! 😼 tanelpoder.com/catvector/

This will (again) be fun! I've talked about this method at P99CONF before, this year I'll launch the first ever production-grade version of this. I'll also introduce *passive sampling* that does not use any tracepoints or probes -> no slowdown for your threads! Demo: www.youtube.com/watch?v=cZ_z...

I have published the CatVector embedding-vector heatmap visualization app (for learning and fun!) as a static webpage now (just browser is enough, no downloads or Python needed). And now we have dark mode too! 😼 tanelpoder.com/catvector/

Learn how xCapture, an eBPF-based Linux thread activity management tool, can capture thread activity of all apps in your system, as well as measure wall-clock time and off-CPU usage from @tanelpoder.com at this year's #P99CONF. Save your spot > www.p99conf.io?latest_sfdc_... #ScyllaDB

YouTube helpfully generated a table of contents for my 11 minute demo video of 0x.tools xtop "top for wall clock time" dimensional performance analysis tool. You see I'm talking about multiple topics there (including syscall,TCP,IO latency) www.youtube.com/watch?v=cZ_z...

This is what I'm currently playing with: *Passive sampling* of hardware interrupt stacks with eBPF. With xintr, you'll soon be able to see inside your interrupt activity even on cloud VMs without hardware performance counters and without kernel probe & tracepoint overhead! Demo link in replies.

What if I told you that now it's possible to see inside hardware interrupt handling activity, even without PMU access on cloud VMs, without tracing or slowing anything down? Thanks to passive sampling with eBPF, task iterators and some pointer chasing, this is now a thing 😎

Achieving 11M IOPS & 66 GiB/s IO on a Single ThreadRipper Workstation. This post was about I/O & hardware geekery, but if you want to learn some thing about modern "computers are networks" topology and PCIe root complexes and some bottlenecks I hit, check out this: tanelpoder.com/posts/11m-io...

As I'm creating new content for my latest online training courses, I just bundled the 2021 "Troubleshooting Very Complex Oracle Performance Problems" videos into the AOT & SQL Tuning courses, without an extra fee; existing attendees will have access too! learn.tanelpoder.com

As I'm creating new content for my latest online training courses, I just bundled the 2021 "Troubleshooting Very Complex Oracle Performance Problems" videos into the AOT & SQL Tuning courses, without an extra fee; existing attendees will have access too! learn.tanelpoder.com

This? modern-sql.com/blog/2023-12...

Achieving 11M IOPS & 66 GiB/s IO on a Single ThreadRipper Workstation. This post was about I/O & hardware geekery, but if you want to learn some thing about modern "computers are networks" topology and PCIe root complexes and some bottlenecks I hit, check out this: tanelpoder.com/posts/11m-io...

New Tool: xstack - Completely Passive eBPF Linux Stack Profiling Without Any Tracepoints tanelpoder.com/posts/xstack...

New Tool: xstack - Completely Passive eBPF Linux Stack Profiling Without Any Tracepoints tanelpoder.com/posts/xstack...

Talking about DB monitoring for developers, this was my attempt, very simple dashboard for developers who do not care about details. Select your application (service on database side) and it will show you these basic details. I don't think it really worked, but at least I think it should be useful:)

Some light video for every evening's entertaining. youtu.be/cZ_zMDQsVjg?... Would you like to have such insights in your system? Go & ask @tanelpoder.com

A new tool in 0x.tools family: xtop - Top for Wall-Clock Time. It uses eBPF/xcapture v3 and gives you "x-ray vision" into Linux system activity. It will be available on next Tuesday 19 Aug at 1pm EDT when I also run a live demo webinar! tanelpoder.com/posts/xtop-t...

A new tool in 0x.tools family: xtop - Top for Wall-Clock Time. It uses eBPF/xcapture v3 and gives you "x-ray vision" into Linux system activity. It will be available on next Tuesday 19 Aug at 1pm EDT when I also run a live demo webinar! tanelpoder.com/posts/xtop-t...

Legendary use case for Claude Code I’ve just heard: “It managed to uninstall all Adobe products from my Mac by telling Claude Code to do this. Toon a bunch of tokens but was worth it.” (Iykyk)

how your terminal handles mouse clicks wizardzines.com/comics/the-m... (from "The Secret Rules of the Terminal", which is out now! wizardzines.com/zines/terminal)

MySQL's New Storage and Execution Engine: DuckDB​ www.linkedin.com/pulse/mysqls...

📚 This week's reading list is out, packed with #announcements and #releases galore. Definitely worth a look! 🔖 Missed some reading lists? Find them all at https://www.geraldonit.com/category/reading-list/

I have 𝟭𝟬 𝗰𝗼𝗺𝗽𝗹𝗶𝗺𝗲𝗻𝘁𝗮𝗿𝘆 𝗳𝘂𝗹𝗹 𝗰𝗼𝗻𝗳𝗲𝗿𝗲𝗻𝗰𝗲 𝗽𝗮𝘀𝘀𝗲𝘀 🎟️ for IBM TechXchange Conference on October 6-9 in Orlando — exclusively for open source project contributors and maintainers.

If you love distributed systems and databases, you should come work with me at PlanetScale! We're looking for engineers to build scalable, reliable, and high-performance database systems. The work is challenging and simultaneously deeply rewarding. pscale.link/soft-eng

Don’t forget to join my CatBench Vector Search Playground demo (and hacking session) on Postgres & Google AlloyDB Omni today at 9am EDT!

Don’t forget to join my CatBench Vector Search Playground demo (and hacking session) on Postgres & Google AlloyDB Omni today at 9am EDT!

I mainly use query planner hints for troubleshooting, and I rarely use them as workarounds. It's essential to understand whether hints force a plan, affecting the result, or favor one and may be ignored. Here's how hints work in #MongoDB dev.to/franckpachot...

Mystery solved!! Ubuntu 22.04 had an automatic update to systemd. This update restarted systemd that wiped IP rules and took down networking for Kubernetes infra. The update came out 9 June. 9-10 June dozens of services had big outages. Like Heroku: newsletter.pragmaticengineer.com/p/why-reliab...

Whoa - Datadog's largest-ever outage in 2023 was caused by the same thing as Heroku's largest-ever one this June. Same OS version (Ubuntu 22.04), same process (sytemd) If Heroku had done the same changes Datadog publicly shared in 2023, Heroku's outage would not have happened.

Support @openrightsgroup.bsky.social making a legal intervention at the hearing of the tribunal on the case of Apple's Advanced Data Protection being undermined in the UK action.openrightsgroup.org/make-our-voi...

I currently run my blog using Hugo and GitHub Pages. Does anyone know of a way to bolt on a substack-esque email subscription option? I want to retain ownership of content, but seem to remember someone talking about something that did this. Sound familiar, @ssp.sh perhaps?

Our latest tech blogger interview features “long-time performance geek” @tanelpoder.com. He just hit 18 years of blogging, and that deep experience really comes across in his thoughtful responses. writethatblog.substack.com/p/tanel-pode...

Do your outer join queries produce more rows than expected? In this blog post, I show a strange result when using filter predicates in the join clause. dbLinter can help you sort your join and filter criteria and spot issues like this. www.salvis.com/blog/2025/07...

New Webinar: Testing High-Performance Vector Search With CatBench on Google AlloyDB Omni Time: Wednesday, July 23th at 9am EDT. Sign up here: rsvp.withgoogle.com/events/bench... More info: tanelpoder.com/posts/testin... /cc @kirantailor.bsky.social