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Emulating x86 on X64 on Aarch64
Emulating win32 on Mac using Apple's x64 emulator.
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 4,389 posts.
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TCP is an underspecified two-node consensus algorithm
I recently found myself dealing with TCP load balancing for a project and I've come to think that generic TCP proxies can't be implemented without substantial pain and how it makes TLS terminating proxies a bad idea.
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Thinking in Actors – Challenging your software modelling to be simpler
Challenging your software modelling techniques to be simpler
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Unit testing a TCP stack (2015)
Thoughts on how to write automated tests for a TCP implementation.
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Reading and writing are less symmetric than you (probably) think
I am talking about the I/O operations as used in computing here. A typical example of how this kind of thing is exposed are the POSIX syscalls read(2) and write(2), which have the following C funct…
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Formatting Is Unreasonably Expensive for Embedded Rust
As a (late) part of the #rust2020 request, I wanted to talk about one of the paper-cuts that has become decently problematic for new and experienced users of Embedded Rust: The size costs of formatting in Rust today are unreasonably expensive for users of Rust on bare metal embedded systems. In particular there are…
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Static Allocation, Constant Work
In reply to this email:
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Latency Sneaks Up on You
As systems get big, people very reasonably start investing more in increasing efficiency and decreasing costs. That’s a good thing, for the business, for the environment, and often for the customer. Much of the time efficient systems have lower and more predictable latencies, and everybody enjoys lower and more…
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How to Write a Computer Emulator
I wrote this document after receiving large amounts of email from people who would like to write an emulator of one or another computer but do not know where to start. Any opinions and advices contained in the following text are mine alone and should not be taken for an absolute truth. The document mainly covers…
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Tokyo Cabinet DB: Beyond Key-Value Store
It took Ruby some time to go from an infant research project by Matz to a language we've all come to know so well. Now, another Japanese developer ( Mikio Hirabayashi ) has all the potential to repeat this cycle with his new database project: Tokyo Cabinet . Developed and sponsored by Mixi Inc . (Japanese Facebook)…
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Bringing up 802.11ac on FreeBSD
I've been chipping away at bringing up 802.11ac on FreeBSD. I've been meaning to write this post for a while, but you know, life got in the ...
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The One Second Dash
The Amazon Dash is a $5 WiFi button that summons a truck to deliver you water or other stuff. Want your Dash to do something else? The popular approach is to sniff its ARP requests. This requires that Dash connect to your network, putting you perilously close to having some DUDE delivered with your IoT mood lighting.
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On Layout and Web Performance
Outside of initial page load problems, “layout thrashing” is the most common performance problem I see in dynamic web applications. This is particularly true for Single Page Applications which build and destroy views on the fly. However, I’m often amazed by the number of web developers I run into who are unaware of…
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Writing a Hypervisor in 1k Lines
Writing a Hypervisor in 1,000 Lines
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An Introduction to Vectorization
Your CPU has a 32-bit addition instruction that computes the sum of two 32-bit integers x and y, producing a 32-bit result. (The 33rd bit of the sum, the "carry bit", is usually thrown away.)
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Saving a Third of Our Memory by Re-Ordering Go Struct Fields (2020)
Simply changing the order of some uint variables we managed to drop our memory usage significantly
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A Usable C++ Dialect That Is Safe Against Memory Corruption
Quote: we DID get a perfectly usable C++ dialect which is also 100% safe against memory corruption and against memory leaks. Another Quote: we can (and often...
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OpenVMS 9.2 for x86: Auto boot, licenses, PAKs, networking and SSH
Published: 15-04-2023 22:30 | Author: Remy van Elst | Text only version of this article
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Writing Linux Modules in Ada (2016)
In the following series of blog posts I will document my attempts to write Linux modules using the Ada language. In part 1, I will demonstrate how to write in Ada and build a simple "hello world" Linux kernel module. Additionally, I will introduce a basic customized Ada runtime to support our "hello world" module…
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The historical significance of DEC and the PDP-7, -8, -11 and VAX
Earlier today, I saw a link on the ClassicCmp.org mailing list to a project to re-implement the DEC VAX CPU on an FPGA. Its entitled First new vax in ...30 years? Someone posted it on Hackernews . One of the comments said, roughly, that they didnt see the significance and…
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Car alarms and smoke alarms: tradeoff between sensitivity and specificity (2012)
Wouldn’t you like to live in a world where your monitoring systems only alerted when things were actually broken? And wouldn’t it be great if, in that world, your alerts would always fi…
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I've had bad luck with transparent hugepages on my Linux machines
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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Linuxulator on FreeBSD Feels Like Magic
Most linux software just work on FreeBSD
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An extensive ZFS setup on MacOS
DISCLAIMER: If you are in no way familiar or comfortable with the Terminal, this is not for you.
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Optimizing Ruby Path Methods
Back in November last year, I started a new job at Intercom, and one of the first projects I got to work on was improving the Intercom monolith CI with some of my new colleagues.