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The most popular blog posts about systems & performance on Hacker News. 6,943 posts.
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…
In a recent post , Andreas declared his love for the programming language FORTRAN. He concluded his post with the question “Can a functional...
Modern processors are superscalar, meaning that they can execute many instructions at once. For example, some processors can retire four or six instructions per cycle. Furthermore, many of these processors can initiate instructions out-of-order: they can start working on instructions that appear much later in the…
Update to this story at 20 Feb 2018: I’ve been debugging the problem together with Apple and I feel like we are closing in on a solution. My current guess is that Finder indexing needs a lot more time on High Sierra than on Sierra clients.
At Terrateam, we are big fans of Fly.io. The service is hosted there and it’s served us well. Just deploy your TOML file, get your infrastructure, do something else with the rest of your day. One of the interesting sides of Fly is that they invest heavily in server-side SQLite. They’ve written a number of blog posts…
Tokio is a runtime for writing reliable asynchronous applications with Rust. It provides async I/O, networking, scheduling, timers, and more.
DragonFly version 5.4 brings a new system compiler in GCC 8, improved NUMA support, a large number of network and virtual machine driver updates, and updates to video support. This release is 64-bit only, as with previous releases.
A high-performance and high-level purely functional data-parallel array programming language that can execute on the GPU and CPU.
Update: I have created an awesome-minisforum-v3 GitHub repository to list information for Minisforum V3 users, including some workarounds for the issues mentioned in this review. Quest for the Ideal
Last week I noticed some unexpected assembly code in a function calling std::unordered_map::find (yes, I know, friends don’t let friends use STL, but that is a topic for another discussion). I decided to investigate a bit and it turned out to be quite a journey. It was a Clang compiler, ARM-based platform, I will use…
You may know that, because your computer has different caches (L1, L2, L3...), and memory operations operate on cache lines of about 64 bytes each, you should write programs that exhibit locality to get maximum performance.
Suppose you want to pick an integer at random in a set of N elements. Your computer has functions to generate random 32-bit integers, how do you transform such numbers into indexes no larger than N? Suppose you have a hash table with a capacity N. Again, you need to transform your hash values (typically 32-bit ……
This is a co-production with Veedrac, who wrote most of the awesome technical details.
A tour of recent work to re-engineer Git’s garbage collection process to scale to our largest and most active repositories.
This blog post has been archived! SpacetimeDB has improved a lot since I initially published this technical review, and most of the technical details in it no longer apply.
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Today, I chrooted in my system from sysresCD and I discovered that running eix-update (a gentoo portage indexing program) ran almost 3x fas...
In the recent past, a typical client/server environment consisted of multiple clients connected to a central database server. A central database architecture is a system where all data is stored in a single centralized location. When client A from Si...
The design and implementation of modern column-oriented database systems Abadi et al., Foundations and trends in databases, 2012 I came here by following the references in the Smoke paper we looked…
Monday’s /r/dailyprogrammer challenge was to write a program to read a recurrence relation definition and, through interpretation, iterate it to some number of terms. It’s given an initial term ( u(0) ) and a sequence of operations, f , to apply to the previous term ( u(n + 1) = f(u(n)) ) to compute the next term…
A very common adage in ODE solvers is that if you run into trouble with an explicit method, usually some explicit Runge-Kutta method like RK4, then you should try an implicit method. Implicit methods, because they are doing more work, solving an implicit system via a Newton method having “better” stability, should be…
As SPDY works its way through IETF ratification I began wondering whether it was really necessary to add a complex, binary protocol to th...
This essay explores the cost of multitasking through computer science concepts like context switching and advocates for the focus found in single-threaded moments.
Update : Dongli Zhang reports that newer Linux versions organize the stack differently . The code below will need to be modified accordingly.
Essential data from the ExoMars Schiaparelli lander sent to its mothership Trace Gas Orbiter during the module's descent to the Red Planet's surface yesterday has been downlinked to Earth and is currently being analysed by experts.
If you’ve been in this trade for a while, you have probably seen dozens of debates on the merits and problems of SQL as a relational database query language. As an ORM maintainer, I have a few gripes with SQL, but overall it is workable, and anyway, it has so much inertia that there’s no point fantasizing about a…
