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A million ways to die from a data race in Go
I have been writing production applications in Go for a few years now. I like some aspects of Go. One aspect I do not like is how easy it is to create data races in Go.
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An Update on TinyKVM
Hey all. TinyKVM was open-sourced this february and since then I’ve been working on some things that are very much outside of the scope of…
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Golang's big miss on memory arenas
When your software team needs to pick a language today, you typically weigh two factors: language performance and developer velocity.
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Shipping textures as PNGs is suboptimal
Are you shipping textures to players as PNGs? The goal of this post is to convince you that this is suboptimal, and walk you through a better approach.
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What Does a Database for SSDs Look Like?
What does a relational database designed specifically for local SSDs look like? Postgres, MySQL, SQLite and many others were invented in the 90s and 00s, the era of spinning disks. A local NVMe SSD has ~1000x improvement in both throughput and latency. Design decisions like write-ahead logs, large page sizes, and…
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How to escape the Linux networking stack
Many products at Cloudflare aren’t possible without pushing the limits of network hardware and software to deliver improved performance, increased efficiency, or novel capabilities such as soft-unicast, our method for sharing IP subnets across data centers. Happily, most people do not need to know the intricacies of…
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Susctl CVE-2024-54507: A particularly 'sus' sysctl in the XNU kernel
A very sus sysctl in the XNU kernel.
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Acronis True Image costs performance when not used
Over two years ago I installed Acronis True Image for Crucial in order to migrate my data to a new SSD I had just purchased. It worked. I then left True Image installed “just in case”, and what har…
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Why use OpenBSD?
Last week-end, I was invited to the UNIX Social Camp in Dijon, France to talk about the reasons I still use OpenBSD these days and why should others do so; or at least, have a look at OpenBSD . This post is an English transcription of the original French slides that are available here .
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Atomics and Concurrency
This is going to be a long post, but I hope you get value out of it. This wasn’t an easy topic to tackle but it was definitely worthwhile!
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Mac history echoes in current Mac operating systems
Ars Technica mentioned that in macOS Tahoe the venerable old hard disk icons will be replaced with new, more generic, relatively less inte...
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A Real PowerBook: The Macintosh Application Environment on a Pa-RISC Laptop
I like the Power ISA very much, but there's nothing architecturally obvious to say that the next natural step from the Motorola 68000 family...
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NT OS Kernel Information Disclosure Vulnerability
Bidding farewell to one of the last kernel address leaks, CVE-2025-53136. Even patches can open new doors for exploitation.
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Reproducing the AWS Outage Race Condition with a Model Checker
Welcome to Waqas' blog
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Cutting down Rust compile times from 30 to 2 minutes with one thousand crates
How we split Feldera into a thousand crates to use every core rustc can get, cutting compile times from 30 minutes to 2.
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Don't tug on that, you never know what it might be attached to (2016)
From the highly eclectic blog of Mark Dominus
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The case of the UI thread that hung in a kernel call
I did tell you not to do that.
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Comparison of C/POSIX standard library implementations for Linux
The table below and notes which follow are a comparison of some of the different standard library implementations available for Linux, with a particular focus on the balance between feature-richness and bloat. I have tried to be fair and objective, but as I am the author of musl , that may have influenced my choice of…
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The current state of TLA⁺ development
The 2025 TLA⁺ Community Event was held last week on May 4th at McMaster University in Hamilton, Ontario, Canada. It was a satellite event to ETAPS 2025, which I also attended, and plan to write about in the near future. I gave a talk somewhat-hucksterishly titled It’s never been easier to write TLA⁺ tooling! which I…
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How memory maps (mmap) deliver faster file access in Go
Learn how memory maps (mmap) accelerate file I/O, reduce latency, and improve app performance in Unix and Go with real-world benchmarks.
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The stack circuitry of the Intel 8087 floating point chip, reverse-engineered
Early microprocessors were very slow when operating with floating-point numbers. But in 1980, Intel introduced the 8087 floating-point copro...
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How Ruby executes JIT code
Where does JIT-compiled code live? How does Ruby switch between bytecode and native execution? Why does TracePoint slow everything down? This post answers the JIT questions most Ruby developers have but rarely see explained.
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Ditch your mutex, you deserve better
The Personal blog and musings of Chris Penner, a designer, developer and future opsimath.