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Chaos Monkey Guide for Engineers
A complete and comprehensive guide to learn about, set up, and deploy Chaos Monkey and other similar tools for creating chaos. Download the whole guide.
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 498 posts.
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How I ended up writing a new real-time kernel (2015)
You're reading the original article in English. You can as well read the translation in Russian .
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Linux Observability with BPF
Why BPF and XDP are something you should learn.
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Evolution of the x86 context switch in Linux (2018)
Tracing the x86 context switch in Linux throughout time
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Where do interrupts happen?
Trying to determine exactly where asynchronous interrupts are delivered on Intel CPUs.
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Stop Memsetting Structures
TL;DR: Use C99’s designated initializers instead. Because it’s 2019! Edit: This post was discussed on Hacker News, Lobste.rs and /r/c_programming. It has been updated to address some of the concerns raised by commenters. One of the little things that annoy me when reading code is the unnecessary use of memset() to…
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When pigs fly: optimising bytecode interpreters
This is part two in my series of articles about bytecode interpreters, based on a small stack virtual machine which I have nicknamed PM…
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The Maturing of QUIC
QUIC, the new internet transport protocol set to replace TCP, was comprehensively built by tech industry leaders over nearly seven years. Go behind the scenes to see how QUIC evolved from a lofty experiment to a standard set to modernize the internet.
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A2-class microSD cards offer no better performance for the Raspberry Pi
Update: See follow-up post about A1 vs A2 performance, Raspberry Pi microSD follow-up, SD Association fools me twice?. After I published my 2019 Raspberry Pi microSD card performance comparison, I received a lot of feedback about newer 'A2' Application Performance class microSD cards, and how they could produce even…
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Let's Talk Concurrency with Sir Tony Hoare
When considering the panel to discuss concurrency, you’d be pushed to find a higher calibre than Sir Tony Hoare, Joe Armstrong, and Carl Hewitt.
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PostgreSQL Performance on Raspberry Pi
Have you ever wondered how well PostgreSQL performs on a Raspberry Pi 3B ? Oh. You haven't? Oh well, I asked myself that question and put it to the test. This post covers how I used pgbench to answer this question and the results of what I found.
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A Primer on Database Replication (2017)
A Primer on Database Replication
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The potential risk to ZFS created by the shift in its userbase
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
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Fedora 30
It seems like it was just six months ago that we announced Fedora 29, and here we are again. Today, we announce our next operating system release. Even though it went so quickly, a lot has happened in the last half year, and you’ll see the results in Fedora 30. If you’re impatient, go to […]
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The July Galileo Outage: What happened and why
By bert hubert / bert@hubertnet.nl This post is an excerpt of a far longer post on Galileo, its structures and the cause of the outage. Here we’ll only focus on the outage - the potential underlying reasons behind it are described in the full article. Since the week-long outage in July I’ve been fascinated by Galileo…
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An x86 Assembler in 256 LOC (2017)
For the first “real” post in this blog, we’ll build an x86 assembler in less than 256 lines of C code. Obviously, it won’t implement every x86 instruction, but it will implement a surprisingly useful subset: data movement, control flow, integer arithmetic, bitwise operations, and function calls. We won’t be able to…
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Why don't we have Wayland on Raspberry Pi yet? (2018)
I have long wanted to create my own desktop operating system targeting the Raspberry Pi. I believe we should have a hackable desktop environment that is both powerful and lightweight, similar to BeOS and the Amiga. To build this desktop we really need full control over how apps draw to the screen, but still have…
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Parallel Commits: A New Atomic Commit Protocol for Distributed Transactions
Parallel Commits are an atomic commit protocol in CockroachDB. The feature promises to halve the latency of distributed transactions by performing all consensus round trips required to commit a transaction concurrently.
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Shipping a compiler every six weeks
This blog post is a slightly edited version of the live transcript of the talk I gave at RustFest 2019 in Barcelona on November 10th, 2019. As it's a transcript some parts of it are a bit repetitive or badly worded, but I hope the message behind the talk will be conveyed by this post anyway.
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State of Industrial Control Systems in Poland and Switzerland
TL;DR New update for Kamerka allows to map Industrial Control Systems of whole country. As in previous version, interactive map is created…
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Better HTTP/2 Prioritization for a Faster Web
Advancing the state of the art of HTTP/2 to deliver a faster user experience. See why it matters and how much of a differenc
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Performance Tuning for .NET Core
Some of you may know I've been spending whatever time I can scrounge together grinding away at a new serialization library for .NET. Serializers can be complicated beasts. They have to be reliable, flexible, and fast beyond reproach. I won't convince you that serialization libraries have to be quick — in this post…
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The sad state of font rendering on Linux
As it turns out, font rendering is a highly controversial topic. If you don’t see anything wrong with Linux font rendering, please disregard this as a shitpost. Thanks.
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Battle testing data integrity verification with ZFS and Btrfs
In this article I share the results of a home-lab experiment in which I threw some different problems at ZFS, Btrfs and mdadm+dm-integrity in a RAID-5 setup.