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A Foolish Consistency: Consul at Fly.io
Documentation and guides from the team at Fly.io.
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What FreeBSD can offer compared to other operating systems (2020)
I really wanted to make this article short … but I failed miserably. At least I tried to organize it well so one may get back to it after ‘some’ reading because its not a short le…
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Linux Kernel Ksmbd Use-After-Free Remote Code Execution Vulnerability
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.
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The Sad State of Debug Performance in C++
By now it should be (hopefully) widely known that the term “zero-cost abstractions” is a misnomer. Although, to be clear, it's more of an unfortunate name.
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Removing characters from strings faster with AVX-512
In software, it is a common problem to want to remove specific characters from a string. To make the problem precise, let us consider the removal of all ASCII control characters and spaces. In practice, it means the removal of all byte values smaller or equal than 32. I covered a related problem before, the … Continue…
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How we made data aggregation on PostgreSQL better and faster
They’re so fast we can’t catch up! Check out our benchmarks with two datasets to learn how we used continuous aggregates to make queries up to 44,000x faster.
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Hooking Go from Rust
How did we hook Go functions from Rust to work with mirrord? A quick dive into the Go Runtime and switching from the Go stack to the system stack.
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Fuzzing ping(8) and finding a 24 year old bug
FreeBSD had a security fluctuation in their implementation of ping(8) the other day. As someone who has done a lot of work on ping(8) in OpenBSD this tickled my interests.
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Build the Modular Monolith First
Even talking about building a monolith today, is a bit taboo. It is all about microservices at the moment, and has been for a few years. But they aren’t a silver bullet…
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No, QuestDB is not Faster than ClickHouse
telegra.ph/no-questdb-is-not-faster-than-clickhouse-06-152022144 points63 commentscited by 3Databases & Data details
QuestDB created a minor stir in the small but active world of analytics database benchmarking with this blog article: https://questdb.io/blog/2022/05/26/query-benchmark-questdb-versus-clickhouse-timescale. This is the money quote: “QuestDB is an order of magnitude faster than both TimescaleDB and ClickHouse in this…
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Lunatic brings Erlang's principles to WebAssembly
In this month’s episode of the Functional Futures podcast, our guest is Bernard Kolobara – the creator of Lunatic, an Erlang-inspired runtime for WebAssembly. Listen to the episode to find out how Erlang's guiding principles helped Bernard create a runtime that's fast, robust, and scalable.
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Hand-optimizing the TCC code generator
I am on a number of different compiler mailing lists. One of those is the mailing list for the Tiny C Compiler . Imagine my surprise when a recent email mentioned our latest series and suggested trying a similar approach to improve the code generator in TCC. I was interested to see if there were any low-hanging fruit…
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If one GUI's not enough for your SPARC workstation, try four
Who needs a jack-o-lantern when you've got a bright orange gas plasma display? This is a 1990 Solbourne Computer S3000 all-in-one workst...
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Request Coalescing in Async Rust
As the popular saying goes, there are only two hard problems in computer science: caching, off-by-one errors, and getting a Rust job that isn’t cryptocurrency-related. Today, we’ll discuss caching!...
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Running Rust on Logic Gates
A journey in building an ARM CPU from scratch in a digital circuit simulator, and running Rust on it to interpret Scheme and serve Web pages.
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Zaplib post-mortem
Welp, this is a weird blog post! Very unexpectedly, we quickly invalidated some of the core hypothesis that make Zaplib work as a startup.
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RETRO is fast
When I first read Google’s RETRO paper, I was skeptical. Sure, RETRO models are 25x smaller than the competition, supposedly leading to HUGE savings in training and inference costs. But what about the new trillion token “retrieval database” they added to the architcture? Surely that must add back some computational…
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Freenet build 1495: new user experience and performance
Hyphanet is a peer-to-peer platform for censorship-resistant communication and publishing.
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DWARF-Based Stack Walking Using eBPF
Deep dive into the new DWARF-based stack unwinder using eBPF.
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Linux Threat Hunting: ‘Syslogk’ a kernel rootkit found in the wild
Syslogk Rootkit Revealed: Analysis
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How to JIT – An Introduction
When I wrote the introductory article for libjit , I aimed it at programmers who know what JITs are, at least to some extent. I did mention what a JIT is, but only very briefly. The purpose of this article is to provide a better introductory overview of JITing, with code samples that don't rely on any libraries.
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Encrypted DNS and NTP = Deadlock
I recently found out the hard way that encrypted DNS can deadlock with NTP on embedded devices without a battery-backed clock.
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On building 30k Debian packages
As part of my ongoing attempts to create some nice datasets for training large code models for C/C++ , I've recently been attempting to buil...
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Scaling Kubernetes to Thousands of CRDs
Over the past few months Crossplane has pushed the boundaries of Kubernetes with the number of Custom Resources it supports. In this post we’ll explore the limitations Upbound engineers have discovered and how we’ve helped to overcome them.
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Text consoles and framebuffer consoles in Linux
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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A decade of major cache incidents at Twitter
This is a collection of information on severe ( SEV-0 or SEV-1 , the most severe incident classifications) incidents at Twitter that were at least partially attributed to cache from the time Twitter started using its current incident tracking JIRA (2012) to date (2022), with one bonus incident from before 2012. Not…