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Gallery of Processor Cache Effects
Most of my readers will understand that cache is a fast but small type of memory that stores recently accessed memory locations. This description is
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 4,389 posts.
2612
Archiving Steam games for fun and profit
Why do I do this to myself? I have no idea. Anyway, let's learn how to eat disk space.
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A dive into the AMD driver workflow
I ended up getting a response from high level people at AMD. It was still very light on any real technical information, but it did include some great phrases like “I am able to replicate the issues you are facing” and some mockable phrases like “We are hoping that this will improve your perception of AMD products and…
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What are Linux containers and how did they come about?
Today's announced collaboration between Red Hat and dotCloud , the company behind Docker, is exciting for a lot of reasons. As the release n...
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So, you want to chunk really fast?
How we built memchunk - a blazing fast text chunking library using SIMD and memchr for RAG pipelines
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Walkthrough for Systemd Portable Services
Posts and writings by Lennart Poettering
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Plan 9 is a uniquely complete operating system
A large contributor to the "feel" of an Operating System comes from the software it chooses to include by default. There are entire linux distributions that differentiate themselves just based on the default configured software. There is room for so many options of base software because there are in general many…
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AVX512 VBMI – remove spaces from text
Removing spaces from a string is a common task in text processing. Instead of removing single character we often want to remove all the white space characters or the punctuation characters etc.
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I/O Multiplexing (select vs. poll vs. epoll/kqueue)
Problems and Algorithms
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Long distance sound localization with the Raspberry Pi
TDOA Sound Localization is determining the source of a sound when all you know is the differences in the time of arrival of the sound event…
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The cult of Amiga and SGI, or why workstations matter
I’m considered to be a server guy. I had access to some really awesome server machines. Still, when computers come up in discussions, we are almost exclusively talk about workstations. Even if servers are an important part of my life, that’s “just” work. I loved the SGI workstations I had access to during my…
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Falsehoods programmers believe about undefined behavior
All kinds of reasonable-sounding beliefs about undefined behavior are wrong. Let's go through them.
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A bug story: data alignment on x86
This sounds unusual. Who ever wants to do this in real life? Normally, we only see code like this as primary school assignments or compiler benchmarks. However, this time it happened in real life.
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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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Fun with Kermit and ZMODEM over SSH
Fun with Kermit and ZMODEM file transfers over SSH using Qodem
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Optimizing compilers reload vector constants needlessly
Modern processors have powerful vector instructions which allow you to load several values at once, and operate (in one instruction) on all these values. Similarly, they allow you to have vector constants. Thus if you wanted to add some integer (say 10001) to all integers in a large array, you might first load a…
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Win16 Memory Management
This is a kind of knowledge base article which resulted from attempts to understand exactly how memory management works in 16-bit Windows. It is not exactly undocumented, but it is also not well documented; even before Windows 3.0 appeared, the assumption was that essentially all application developers were going to…
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Preventing server overload: limit requests being processed
Recently at Bluecore I ran into a familiar situation: during brief periods of overload, all requests to a server were timing out. It was a catastrophic failure, where the server completely stopped serving. We added more capacity to prevent overload, but we also wanted to fix the server. Instead of exploding, it should…
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Understanding the code inside Tornado, the asynchronous web server
If you see this page, the nginx web server is successfully installed and working. Further configuration is required.