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How I Found a 20-Year-Old Linux Kernel Bug
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 263 posts.
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Suicide Linux
You know how sometimes if you mistype a filename in Bash, it corrects your spelling and runs the command anyway?* Such as when changing directory, or opening a file. I have an idea: Suicide Linux. Any time - any time - you type any remotely incorrect command, the interpreter cr...
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PulseAudio under the hood
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Adventures in /usr/bin and the likes
Digging up some useful and not so popular commands in Linux
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Linux tracing systems and how they fit together
Linux tracing systems & how they fit together
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Rethinking the D-Bus Message Bus
Later this year, on November 21, 2017, D-Bus will see its 15th birthday. An impressive age, only shy of the KDE and GNOME projects, whose collaboration inspired the creation of this independent IPC system. While still relied upon by the most recent KDE and GNOME releases, D-Bus is not free of criticism. Despite its…
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Migrating 1200 databases from MySQL to Postgres
Once Upon a Time there was a company called Base7Booking that by the beginning of 2016 it was supporting around 1200 databases on MySQL 5...
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Better Compression with Zstandard
I think I first heard about the Zstandard compression algorithm at a Mercurial developer sprint in 2015. At one end of a large table a few people were uttering expletives out of sheer excitement. At developer gatherings, that's the universal signal for something is awesome . Long story short, a Facebook engineer…
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Where has my disk space gone? Flame graphs for file systems
Using the flame graph visualization to determine where file system or disk space is consumed, and answer where space has gone.
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Serverless Raspberry Pi Cluster with Docker
Learn how to deploy Docker Swarm to create a Raspberry Pi cluster then turn it into a serverless super-computer with the OpenFaaS framework for Docker.
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We need to document macOS
macOS is now largely undocumented. It’s time to do the job ourselves: what about an open collaborative project?
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The TTY demystified (2008)
The TTY subsystem is central to the design of Linux, and UNIX in general. Unfortunately, its importance is often overlooked, and it is difficult to find good introductory articles about it. I believe that a basic understanding of TTYs in Linux is essential for the developer and the advanced user.
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My VM is lighter and safer than your container
My VM is lighter (and safer) than your container Manco et al., SOSP’17 Can we have the improved isolation of VMs, with the efficiency of containers? In today’s paper choice the authors investigate …
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A bug in GCC that may cause memory leaks in valid C++ programs
This post is to inform you about a bug in GCC that may cause memory (or other resource) leaks in your valid C++ programs.
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Hanging S3 downloads
Large downloads work from all other servers, but fail from S3. Must be a problem on their end, right?
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A faster BBC News front page
Web performance is something I care deeply about both as a developer whose work affects millions of people around the world, and as a user who often accesses the web on slow & unreliable connections. I have regularly and loudly complained that...
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Hey Synaptics, Can You Please Stop Polling
TL;DR – be wary of buying a Lenovo laptop or any other laptop that uses a Synaptics touch pad until Synaptics ships a fixed driver. Their driver has a memory leak and they have a battery-life bug t…
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The Fastest Blog in the World (2015)
Update: James Hague, aka Dadgum was inspired by this to do some work on his blog and I’m happy to report that now his blog is the fastest blog in the world, 4K transferred and 1 request per page, load time < 75 ms. If you have a blog that’s even faster than that let me know.
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Guide to the CoreCLR Source Code
Just over 2 years ago Microsoft open-sourced the entire .NET framework, this posts attempts to provide a ‘Hitchhikers Guide’ to the source-code found in the CoreCLR GitHub repository.
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High-performance .NET by example: Filtering bot traffic
Mistakes and lessons from a real-world feature performance optimizations: from API usage to advanced data structures, from bit hacks to CPU-friendlier code.
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Hell is a multi-threaded C++ program (2006)
What are threads? Every modern operating system has support for threads, and most programming environments provide some level of support for...