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How Does an Intel Processor Boot?
When we switch on a computer, it goes through a series of steps before it is able to load the operating system. In this post we will see how a typical x86 processor boots. This is a very complex an…
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 6,947 posts.
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Memory Safe Inline Assembly
Since Fil-C 0.685, memory-safe inline assembly is supported on both X86_64 and ARM64.
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Packets per Second Limitations in EC2
Part 2 in our series on PPS limitations in AWS EC2 will help your organization.
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Misconfigured Circuit Breakers
Learn to predict how your application will behave in times of failure and how to configure every parameter for your Semian circuit breaker.
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Linux kernel cgroups writeback high CPU troubleshooting
Read on to learn how we used network packet captures and BPF to debug web server performance, ultimately uncovering a Linux kernel performance issue. This investigation was a collaboration between myself and my colleagues.
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Case Study: ByteDance Uses eBPF to Enhance Networking Performance
Bytedance, a global technology company operating a wide range of content platforms around the world at massive scale, faced significant challenges in ensuring performance and stability across its data centers. With over a million servers running containerized applications, the company required a networking solution…
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Why we spent the last month eliminating PostgreSQL subtransactions
How a mysterious stall in database queries uncovered a performance limitation with PostgreSQL.
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The time has come to replace file systems
The time has come to replace file systems!
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Orphaning bcachefs-tools in Debian
Around a decade ago, I was happy to learn about bcache – a Linux block cache system that implements tiered storage (like a pool of hard disks with SSDs for cache) on Linux. At that stage, ZFS on Linux was nowhere close to where it is today, so any progress on gaining more ZFS features in general Linux systems was very…
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Single binary executable packages
In support of software packages that come in the form of a single binary executable (statically linked or portable), that one can just copy anywhere in `${PATH}` and execute, without needing `sudo`, or downloading half the distribution's packages as dependencies.
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My C code works with -O3 but not with -O0
v1.2 - added comments from HN v1.3 - added “What does fits mean ?” v1.4 - added the conclusion When something very basic goes wrong, I have this hierarchy of potential culprits: the compiler buggy hardware OS vendor last and least me, because I don’t make mistakes :) So what...
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Localization Failure: Temperature Is Hard
The Guardian is one of my favorite news sources. I’m a subscriber (support news organizations!) and I read it daily. But it is not immune to errors, as this headline shows:68 °F above average is a …
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Firefox 15 plugs the add-on leaks
Firefox 15 prevents most memory leaks caused by add-ons, including Firebug. For many users with add-ons installed this will significantly reduce Firefox’s memory consumption, without requiring upgrades to those add-ons.
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Moving to a RTOS on the RP2040
As projects get more complicated the tooling has to improve. Outgrowing the arduino-ide is easy on the Pi Pico with the excelent pico-sdk but what if things get even more complicated...
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System loads web pages 34 percent faster by fetching files more effectively
"Polaris" system from MIT's Computer Science and Artificial Intelligence Lab accelerates website load-time by decreasing network trips.
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Point of WebGPU on Native
WebGPU is a new graphics and compute API designed on the grounds of W3C organization (mostly) by the browser vendors. It’s designed for the Web, used by Java...
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How Rust 1.64 became faster on Windows
If you are a Rust developer you have most likely celebrated the news that the version 1.64 released on 22/09/2022 is 10-20% faster on…
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Is sorted using SIMD instructions
Recently, I came across a function that checks whether an array is sorted, i.e. if there is no element which would be greater than its successor. Below is a sample implementation:
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Magic Numbers
1500 bytes is a bit out there as numbers go, or at least it seems that way if you touch computers for a living. It’s not a power of two or anywhere close, it’s suspiciously base-ten-round, and computers don’t care all that much about base ten, so how did we get here?
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Will It Optimize? (2010)
See how well you know (or can anticipate) gcc's optimizer. For each question, the left box contains some code, while the right box contains code that purports to do the same thing, but that illustrates a particular optimization. Will gcc apply that optimization? Put another way, will the code on the left be as fast as…
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The Shepherd 1.0.0 released
Blog posts about GNU Guix.