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Intel's "cripple AMD" function (2009)
Software optimization resources | E-mail subscription to this blog | www.agner.org
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 4,387 posts.
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AWS Lambda Cold Start Times
Let’s compare the performance of all supported runtimes + 2 custom runtimes (Rust and GraalVM).
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In Search of a Faster SQLite
Researchers at the University of Helsinki and Cambridge attempted to build a faster SQLite using modern programming paradigms like io_uring and disaggregated storage. They demonstrate up to a 100x reduction in tail latency. These are my notes.
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Rust is actually portable
Gautham's Blog
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15 Years of Concurrency
Joe Duffy's Blog | Adventures in the high-tech underbelly
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Google fixes nearly decade-old Linux kernel TCP bug
The Google transport networking crew (QUIC, TCP, etc..) deserve a shout out for identifying and fixing a nearly decade old Linux kernel TCP ...
548
I Didn't Need Kubernetes, and You Probably Don't Either
I moved my projects from Kubernetes to Google Cloud Run because I did not want to pay for cluster operations, idle capacity, and job-running infrastructure.
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Rapid DHCP: Or, how do Macs get on the network so fast?
One of life's minor annoyances is having to wait on my devices to connect to the network after I wake them from sleep. All too often, I'll open the lid on my …
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Welcome to Gas Town
Happy New Year, and Welcome to Gas Town!
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Dtrace for Linux
Not explicitly mentioned in that talk, but certainly the most exciting thing, is that Oracle is doing a proper linux kernel port:
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Weird architectures weren't supported to begin with
This post contains my own opinions, not the opinions of my employer or any open source groups I belong or contribute to.
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Things I learned while writing an x86 emulator (2023)
If you’ve read my first post about assembly language, you might expect that this is another post on how to understand assembly language. I will write more about that at some point, but this post is not that. Instead, this post is going to talk about some of the weird things and random trivia I learned while writing an…
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Everything I Know About SSDs
March 2019: Introduction: I started writing this rather long page for my own benefit, when I acquired a upgrade from my old 2006 Win 8 250 gb HDD PC to a Dell Optiflex 3010 with a 128 gb SSD. I never used more than 30 or 40 gb of the system drive, and I'm not a gamer or an avid film or music collector either. Not on a…
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X86 assembly doesn’t have to be scary
Assembly programming can be intimidating for people who have never looked into it any deeper than a glance, but giving that it underpins how the computers we use work it can be helpful having context in regards to what is actually being run by the CPU.
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LD_PRELOAD: The Hero We Need and Deserve
A summary of my undying love for LD_PRELOAD.
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Linux is Most Used OS in Microsoft Azure – over 50 percent of VM cores
For the last few years, Microsoft has stated during event keynotes and in other places that Linux is a rapidly growing operating system (OS) being used within Microsoft Azure. They had proudly stat…
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I Broke Rust's Package Manager for Windows Users
Last weekend I was playing around with a way to represent null-terminated UTF8 strings in Rust. Rather than just toying with it forever, I decided ...
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How Rust optimizes async/await
The issue to stabilize an initial version of async/await in Rust has left final comment period. The feature looks slated to stabilize in an upcoming release, most likely 1.39. This represents the culmination of an enormous amount of work by people all over the Rust community. But it’s also only the beginning of…
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Distributed Systems Classics (2017)
A selected list of timeless and influential papers in distributed systems that shaped the research in the field. Intended to serve as a good…
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Debugging an Undebuggable App
This app has a surprising number of anti-debugging protections. Let's figure out how to bypass them.
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Visualizing Ext4
What does ext4 look like?
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Popcount CPU instruction
Most CPU architectures in use today have an instruction called popcount , short for “population count”. Here’s what it does: it counts the number of set bits in a machine word. For example (assuming 8-bit words for simplicity), popcount(00100110) is 3 and popcount(01100000) is 2 .
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What happened to WebAssembly
Where are they now? You won't believe her new look!
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The Perils of M1 Ownership
The primary admin account on an M1 Mac is its Owner, responsible for authorising the installation and use of second operating systems. Here’s what can go wrong with Ownership.
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TCP, the workhorse of the internet
What is TCP? This post is an exploration of TCP, the workhorse of the internet. This deep dive includes detailed examples and a step-by-step walkthrough. A simple TCP explanation.
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Zero Cost Abstractions
The idea of a zero cost abstraction is very important to certain programming languages, like Rust and C++, which intend to enable users to write programs with excellent performance profiles with relatively little effort. Since this idea is fundamental to the design of Rust and my work, I want to investigate, for a…