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Blending complex systems made my latency 10x higher
Every time someone reports higher latency after migrating to Kubernetes, the root cause is an assumption that changed. This is one of those stories.
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 6,945 posts.
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We halved DNS build delay and cut memory use by 85%
Zone setting changes used to rebuild entire DNS zones, even ones with tens of millions of records. Here is how we built a planner that picks the smallest safe build, cutting full builds by 40%, peak memory by 85%, and halving build delay.
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Tokio and Prctl = Nasty Bug
Recently I encountered a bug so cute that I immediately knew that I will want to share it on my blog. It was one of those bugs that even Rust can’t save you from. It occurred in HyperQueue (HQ), a distributed task scheduler written in Rust that I work on.
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Go's work-stealing scheduler
Deep dive into how scheduler works
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Recommendations about coding in C++
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Hash indexes are faster than btree indexes?
PostgreSQL have supported Hash Index for a long time, but they are not much used in production mainly because they are not durable. Now, ...
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So you think you want to write a deterministic hypervisor?
What is a deterministic hypervisor and why do we need one anyhow?
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An ode to pack: gzip’s forgotten decompressor
The latest 4.13.9 source release of the Linux kernel is 780MiB, but thanks to xz compression, the download is a much more managable 96 MiB (an 88% reduction)
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Building A Node.js Server That Won't Melt
This is episode 5, out of a total 12, in the A Node.JS Holiday Season series from Mozilla's Identity team. For this post, we bring the discussion back to scaling ...
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The faker's guide to reading x86 assembly language
Assembly code scares people. There’s a good reason for that. For many people, writing code in assembly language seems equivalent to writing code in ancient dwarven runes, or calculating pi in roman numerals. The fact that RollerCoaster Tycoon was almost completely written in assembly language sounds almost too amazing…
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MySQL Challenge: 100k Connections
It's not beyond possibility to set up MySQL to achieve 100,000 concurrent connections if you balance network config and use thread pools. By Vadim Tkachenko
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Raw Linux Threads via System Calls (2015)
Linux has an elegant and beautiful design when it comes to threads: threads are nothing more than processes that share a virtual address space and file descriptor table. Threads spawned by a process are additional child processes of the main “thread’s” parent process. They’re manipulated through the same process…
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Properly testing concurrent data structures
There's a fascinating Rust library, loom, which can be used to thoroughly test lock-free data structures. I always wanted to learn how it works. I still do! But recently I accidentally implemented a small toy which, I think, contains some of the loom's ideas, and it seems worthwhile to write about that. The goal here…
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A few spy tools for your operating system (other than strace)
A few spy tools for your operating system (other than strace!)
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Demystifying Debuggers, Part 2: The Anatomy of a Running Program
On the concepts involved in a running program. What happens, exactly, when you double click an executable file, or launch it from the command line, and it begins to execute?
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Cap'n Proto, FlatBuffers, and SBE
Moved to: https://capnproto.org/news/2014-06-17-capnproto-flatbuffers-sbe.html (GitHub Pages doesn't support 301 redirects :(.)
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Performance metrics for web apps
Performance metrics are surprisingly challenging to get right. Here we share how to create metrics that are accurate, precise, and useful!
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System Hardening in Android 11
Posted by Platform Hardening Team In Android 11 we continue to increase the security of the Android platform. We have moved to safer def...
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GCC 6: -Wmisleading-indentation vs. “goto fail;”
Read the most recent Red Hat Developers blog content. Explore our featured monthly resource as well as our most recently published items.
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Essential security for Linux servers (2013)
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Unikernels were hard. key word: were
Justin Cormack, who worked on MirageOS back in the day, called me at the pub to talk about why unikernels are coming back. The friction that made them hard is gone, the operating system is design debt, and if you care about security you should seriously consider them.
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Kubernetes on Oxide: How customer needs shaped our integrations
How customer needs shaped Oxide's Kubernetes integrations.
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The cause for all your Mac OS X mouse annoyances
By that I mean a delay between receiving movement data from the mouse device and rendering the on-screen cursor. The lag of a Mac OS X cursor is at least twice bigger than Windows’ cursor and yes, a human eye can surely notice that.
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MirkoPC – a Raspberry Pi CM4-powered computer made in Poland
The MirkoPC is so far the closest thing to a full-fledged Raspberry Pi desktop computer: Based on the Compute Module 4, it has a full-size M.2 M-key slot, allowing the Pi to boot from reliable and fast NVMe SSD storage, a built-in headphone amp and line out, 4 USB 2.0 ports, gigabit Ethernet, two HDMI ports, and a…
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Say No to Paxos Overhead: Replacing Consensus with Network Ordering
Just say NO to Paxos overhead: replacing consensus with network ordering Li et al., OSDI 2016 Everyone knows that consensus systems such as Paxos, Viewstamped Replication, and Raft impose high over…
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Crawling a billion web pages in just over 24 hours, in 2025
For some reason, nobody's written about what it takes to crawl a big chunk of the web in a while: the last point of reference I saw was Michael Nielsen's post from 2012 .