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The most popular blog posts about systems & performance on Hacker News. 4,390 posts.
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.
This blog post has been archived!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...
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.
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…
In keeping with my passion (?) for displaying local news articles in unexpected places , I figured it would be a fun project to try and see what it would take to display current local news on the Nintendo Wii console’s News Channel .
In this article you'll see how to run a PDP-11 simulator through Docker to interact with Unix as it was back in 1972.
Creating standalone Linux applications with lone.
Gigabit ethernet has been around for a long time, it’s so ubiquitous that there is a very strong chance that if you have a RJ-45 port on your computer, it’s going to be a gigabit ethernet network interface.
It was a calm day on the puppy-linux thinkpad. The CPU was cool, the RAM was operating at double data rate, and a gentle breeze flowed through the chassis as the fan whirred away. A girl wanted to log onto Discord to chat with her friends, but much to her dismay, Discord needed a package update! No matter, such things…
I have taught operating systems at my university, so I will link my notes from that course here regarding processes.
There are two main aspects to compile times that matter to developers. Cold build times, when building from scratch and warm build times when you’ve already built and you’re rebuilding following an edit. This article focuses on warm build times, which for rapid iteration during development is what generally matters…
I spent the last three weeks in Seoul, partly visiting family I hadn’t seen in years and partly taking a vacation from my usual work in my usual city in my usual context of life. While I haven’t been able to work much at all, I spent my subway rides and waiting-in-line times reading the Singularity Sky series of…
where my words occasionally escape /dev/null
In my previous post Serving 200 million requests per day with a cgi-bin, I did some quick performance testing of CGI using a program written in Go. Go works excellently for CGI programs, for many of the same reasons it works so well for CLI programs and system daemons. But, out of curiosity, I decided to do a bit more…
UPDATE 2024-04-15: Windows Terminal 1.19 contains a fix that reduces latency by half! It’s now competitive with WSLtty on my machine. Details in the GitHub Issue.
Having seen this failure mode happen a couple times now, it's time to share. Yes, Virgil, multi-disk failures DO happen during RAID rebuilds. I have pictures, so it MUST be true!First,
