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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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When Sigterm Does Nothing: A Postgres Mystery
A story about a bug with logical replication slot creation on Postgres read replicas
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Perceptual Image Compression at Flickr
At Flickr our users really care about image quality. They also care a lot about how responsive our apps are. Addressing both of these concerns simultaneously is challenging; higher quality images have larger file sizes and are slower to transfer. Slow transfers are especially noticeable on mobile devices. Flickr had…
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Developing Service Oriented Architectures
Having spent the last four years rolling out a handful of service oriented architectures, some lessons are finally coming together, and this is an attempt at documenting them.
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Operating systems battle: OpenBSD vs. NixOS
My feelings about OpenBSD and NixOS, trying to figure out where each is the best
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Lessons from Ancient File Systems
In my previous post , I mentioned that I found a number of oddities when digging through the details of various Atari 8-bit file systems. I...
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Using a Minitel 1B as a serial terminal
So you've got your hands on a late 1980s Minitel 1B (or something slightly later) and then you realize that the entire Minitel network shut ...
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What is the best pointer tagging method?
In this post, we are going to take a deep dive into pointer tagging, where metadata is encoded into a word-sized pointer. Doing so allows us to keep a compact representation that can be passed around in machine registers. This is very common in implementing dynamic programming languages, but can really be used…
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Transactionally Staged Job Drains in Postgres
Building a robust background worker system that leverages transactional isolation to never work a job too early, and transactional durability to never let one drop.
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Inside the Magic Pocket
Dash knows your context, your team, and your work, so your team can stay organized, easily find and share knowledge, and keep projects secure, all from one place.
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Safe-Linking – Eliminating a 20 year-old malloc() exploit primitive
Research by: Eyal Itkin Overview One of our goals for every research project we work on in Check Point Research is to get an intimate understanding of how software work: What components do they contain? Are they vulnerable? How can attackers exploit these vulnerabilities? And more importantly, how can we protect…
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Haiku Activity Report – January 2021
Hello everyone, apparently we made it to 2021! This year we will see the 20th anniversary of Haiku. This report covers hrev54806-hrev54947. Architectures, ports, bootloaders PulkoMandy fixed the build of the openfirmware bootloader for PowerPC. It …
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When you have too much memory for SheepShaver
When I first got my 133MHz BeBox (not new, sadly), it had "only" 32MB of memory and it had four more SIMM slots to fill. While Be only off...
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Exponential Rate Limiting
Following my previous post on rate limiting with GCRA, leaky buckets without the buckets , I reviewed my old notes on rate limiting for Exim . I thought I should do a new write-up of the ideas that I hope will be more broadly interesting.
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TCP doesn't suck, and all the proposed bufferbloat fixes are identical
: While I'm suspicious of all JIT-compiled languages, C# has always had a much better IL than java, even since version 1.0, making it easy...
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Filesystems can experience at least three different sorts of errors
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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Basics of Futexes
The futex (short for "Fast userspace mutex") mechanism was proposed by Linux contributors from IBM in 2002 [1] ; it was integrated into the kernel in late 2003. The main idea is to enable a more efficient way for userspace code to synchronize multiple threads, with minimal kernel involvement.
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Scion – A Novel Internet Architecture
At RIPE 81, a group of enthusiastic researchers and practitioners from industry and academia discussed with the RIPE community what role RIRs and LIRs could take on in the SCION next-generation Internet architecture. More than 80 BoF participants discussed this question, wanting to learn more about…
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But can your calculator run Linux?
Published: 01-08-2026 20:08 | Author: Remy van Elst | Text only version of this article
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Deterministic multithreading is hard (2024)
Hello, While a lot of time of 2.0 development has been spent on new features and quality of life, we still take care of the smaller details and technical improvements.
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We can do better than line-buffered output
Buffered output typically comes in two flavors: fully buffered and line buffered. If output goes to a terminal then the implementation automatically selects line buffering, flushing its buffer when a line is completed so that it reaches the user immediately. Otherwise it fully buffers, holding output until the buffer…
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URG
If you asked software engineers some of their “least hated” things, you’ll likely hear both UTF-8 and TCP. TCP, despite being 35 years old, is rock-solid, stable infrastructure that we take for granted today; it’s hard to sometimes realize that TCP was man-made, given how well it’s served us. But within every single…
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MirageOS v2.5 with full TLS support
Read the post on "MirageOS v2.5 with full TLS support" from our blog.
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Mac: Keyboard Shortcuts Killed by Bug
Want to use App Shortcuts in Mojave? You’re out of luck because its broken, and Apple can’t be bothered to fix it.
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