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Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 6,943 posts.
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A 32-year-old bug walks into a Telnet server
A long, long time ago, in a land free of binary exploit mitigations, when Unix still roamed the Earth, there lived a pre-authentication Telnetd vulnerability. In fact, this vulnerability was born so long ago (way back in 1994) that it may even be older than you. To put the
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AWS’s Elastic Load Balancer is a Strangler
The Strangler is an extremely effective technique for phasing out legacy systems over time. Instead of spending months getting a new system up to parity with the current system so that clients can…
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Prefix Sum with SIMD
In other words, the $k$-th element of the output sequence is the sum of the first $k$ elements of the input sequence.
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Why Ice Lake is Important – a bit-basher’s perspective
With Computex, there’s been a ton of news about Ice Lake (hereafter ICL) and the Sunny Cove core (SNC). Wikichip, Extremetech and Anandtech among many others have coverage (and there will be …
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Running SunOS 4 in QEMU (Sparc)
SunOS is a historical UNIX operating system widely used from the mid 80s into the early/mid 90s. Older versions of QEMU struggled to emulate the SPARC platform that SunOS ran on, but QEMU v7.2 supports SPARC well enough to install and run SunOS without any unusual workarounds.
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Escaping privileged containers for fun
Despite the fact that it is not a 'real' vulnerability, escaping privileged Docker containers is nevertheless pretty funny. And because there will always be people who will come up with reasons or excuses to run a privileged container (even though you really shouldn't), this could really be handy at some point in the…
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The school for sysadmins who can’t timesync good
(With apologies to Derek Zoolander and Justin Steven. And to whoever had to touch the HP-UX NTP setup at Queensland Police after I...
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Stack Exchange’s Architecture in Bullet Points
I thought as a break form the normal prose some of our readers might enjoy a short overview of the Stack Exchange Network (including Stack Overflow, Server Fault, and Super User) from a technical view:
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ReactOS 0.4.13
ReactOS is a free, opensource reimplementation of windows
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Here's to the systems programmers – Writing Hello World on a home brew CPU
Writing Hello World on a homebrew CPU
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Turning the database inside-out with Apache Samza (2015)
Confluent is building the foundational platform for data in motion so any organization can innovate and win in a digital-first world.
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Unbloating the buffers
What is bufferbloat, why is it bad, and what to do about it
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Learning SIMD with Rust by Finding Planets (2018)
How to get the most of Rust while keeping your code portable
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Quadrupling code performance with a "useless" if
So I was optimizing a domain-specific compressor the other day, as one does. One important problem was chunking the input string and optimally choosing the most compact encoding for each chunk (different encodings compress different characters better, so where to split is not immediately obvious). The previous post…
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Don’t Trust Activity Monitor on M1 Macs
Using CPU % or Energy values in Activity Monitor appears to show that running code on E cores is less efficient than on P cores. Don’t believe a word of it.
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Building and modifying Linux Kernel with Visual Studio
This tutorial shows how to build the Linux kernel, add a small modification to it and debug the new kernel using Visual Studio with VisualKernel.
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532x Performance Increase for MongoDB with fractal tree indexes
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Millions of Binaries Later: A Look into Linux Hardening in the Wild
With Sophos Cloud Native Security, you can easily integrate protection across multiple environments while minimizing detection time and response.
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Lock-Free Bugs
[ I wrote this post in mid-2014 for debuggers.co, which seems to have gone at least partly defunct, so I am reproducing it here. That site collected answers from programmers to the prompt “What’s the most interesting bug you’ve encountered?” ]
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Making ast.walk 220x Faster
Why ast.walk when you can ast.sprint? How we made Python AST traversal 220x faster while building a custom linter for Reflex's AI code generation.
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Reducing code size in librsvg by removing an unnecessary generic struct
Someone mentioned cargo-bloat the other day and it reminded me that I have been wanting to measure the code size for generic functions in librsvg, and see if there are improvements to be made.
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Analyzing the Limits of Connection Scalability in Postgres
Why it’s important to improve Postgres connection scalability, plus an analysis on the limits of connection scalability today.
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Project Zipline – High-throughput low-latency compression
The Open Compute Project (OCP) Global Summit 2019 kicks off today in San Jose where a vibrant and growing community is sharing the latest in innovation to make hardware more efficient, flexible, and scalable.
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Small, Freestanding Windows Executables
Recently I’ve been experimenting with freestanding C programs on Windows. Freestanding refers to programs that don’t link, either statically or dynamically, against a standard library (i.e. libc). This is typical for operating systems and similar, bare metal situations . Normally a C compiler can make assumptions…
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