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The most popular blog posts about systems & performance on Hacker News. 4,390 posts.
$ curl ‐‐http2 https://daniel.haxx.se/ curl: (1) Unsupported protocol curl on mac curl has been shipped by default on Mac OS X since many years - I actually couldn't even manage to figure out exactly how many. It is built and bundled with the operating system by Apple itself and on Apple's own terms and even ……
An empirical study on the correctness of formally verified distributed systems Fonseca et al., EuroSys’17 “Is your distributed system bug free?” “I formally verified it!R…
Apple II disk controller cards are weird, there are a crazy number of different types , and many are rare and expensive. Can an FPGA-based solution save the day for retro collectors? You bet! Nearly all the existing disk controllers connect the same 8-bit bus to the same 19-pin disk interface, so a universal clone is…
On this post we're going to talk about Eventual Consistency in the context of lock-free and wait-free data structures, with focus on the C++...
Hash tables are the most popular probabilistic data structure, by quite a margin. You compute some hash code then compute an array index from that hash code. If you’re using open addressing-c…
Teaching rigorous distributed systems with efficient model checking Michael et al., EuroSys’19 On the surface you might think today’s paper selection an odd pick. It describes the labs enviro…
Given the current register state for a thread, and read-only access to memory, what would the register state hypothetically become if the current function was to immediately return and execution was to resume in its caller?
TLDR; Starting from Linux kernel version 6.9 on x86_64, there’s a new config option CONFIG_X86_FRED enabled and it adds 16 bytes to the starting point of a task’s kernel stack area, so you’ll need to account for this extra padding in your “raw” kernel stack & pt_regs lookup code. Update: It turns out that there’s a…
This is a companion article to my talk at Neovimconf 2023. I have been using Vim/Neovim as my full time text editor for close to 10 years. I’ve spent a lot of time in the terminal and have become very aware of the many flaws and idiosyncrasies of this bizarre platform. But I also think it gets a lot of things right!…
Paying customers better get used to crowdsourced beta testing.
One of my readers asked for my opinion about the provocative “It’s Time to Replace TCP in the Datacenter” article by prof. John Ousterhout. I started reading it, found too many things that didn’t make sense, and decided to ignore it as another attempt of a proverbial physicist solving hard problems in someone else’s…
An deep dive into a pathological case.
A single-producer single-consumer (SPSC) queue is a great example of how far constraints can take a design. In this post, you will learn how to implement a ring …
In a real world benchmark, the default musl allocator caused a 7x slowdown compared to other allocators. I recommend all Rust projects immediately swap to a different allocator in a musl environment.
And why you should too!
Experienced professional software engineer based in York, UK
I've noticed more than once that some programmers are confused about the direction in which the stack grows on x86, and what "top of the stack" and "bottom of the stack" mean. It appears that this confusion is caused by a basic mismatch in the way people are used to thinking about stacks, and in the way the stack on…
We have created the seL4 Foundation! But what is the seL4 Foundation, and why did we create it? In a nutshell, these are the reasons (I’ll expand on them below): Provide for the longevity of …
A post by August Lilleaas, published August 08, 2014.
There is a pattern I’ve learned while using Zig which I’ve never seen used in any other language. It’s an extremely simple trick which - when applied to a data structure - reduces memory usage, reduces memory allocations, speeds up accesses, makes freeing instantaneous, and generally makes everything much, much…
I’ve seen the Mill CPU come up a number of times — maybe because I subscribed to their updates and so I get emails about their talks. They’re getting a bunch of buzz, but every t…
The current structure definition of the ion system heap involves a zero sized array:
A common situation in asyncio Python programs is asynchronous initialization. Some resource must be initialized exactly once before it can be used, but the initialization itself is asynchronous — such as an asyncpg database. Let’s talk about a couple of solutions.
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