The latest blog posts to take off on Hacker News. 4,389 posts.
File systems unfit as distributed storage backends: lessons from 10 years of Ceph evolution Aghayev et al., SOSP’19 Ten years of hard-won lessons packed into just 17 pages (13 if you don’t co…
Was passiert wenn man ein Windows Update durchführt, oder mehrere?.
From the operating system's point of view, we have a large pool of memory from some starting address to some ending address. We can use our linker script (the virt.lds file) to provide us symbols representing the address of the starting and ending points.
Wettbewerb um die ultimative Mindestanforderung für Windows XP zu finden.
I’ve previously blogged about using Pi Zero (and Zero W) devices as USB Gadgets. This allows them to be powered and accessed via one of the micro USB sockets and it shows up as both a CD-Driv…
foobartel Ltd. - Web Design & Development
Browsers historically have had a single HTTP Cache. This meant that if www.a.example and www.b.example both used cdn.example/jquery-1.2.1.js then JQuery would only be downloaded once. Since it's the same resource regardless of which site initiates the download, a single shared cache is more efficient. [1]…
Explanation of everything you can see in htop/top on Linux
I have developed some interest in the Rust programming language. Rust is a systems programming language which means it gets out of the way of developers interested in reaching low-level internals of a system. What sets it aside from other systems languages though is: Borrow checking to guarantee memory safety…
I seem to have a habit of writing about super powerful machines whose many cores are laid low by misuse of locks. So. Yeah. It’s that again. But this one seems particularly impressive. I mean, how …
Compiling a CPU, in a cheap FPGA board
These are my stupid unix tricks. I hope that they are useful to you. Platform Note I use Mac OS X (pron: “ten”). If you don’t, you might want to switch…
Over the past year I've been working on a minimal-dependency hobbyist computing stack (everything above the processor) called Mu . The goal is to:
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…
The Personal blog and musings of Chris Penner, a designer, developer and future opsimath.
A bundle called IncompatibleAppsList.bundle found in /Library/Apple/Library/Bundles/ in macOS Catalina contains a of list of 235 apps that are incompatible with Catalina.
I’m working on more posts about the Catalina release, but I wanted to start with a short warning. I’ve heard a bunch of reports of data loss in Apple Mail. Thankfully, none seem to be caused by my apps . (Ironically, one of the bugs I’ve encountered is the inability to delete messages via AppleScript.) And, in fact…
Serial Number of First Unix System In preparation for a talk on Seventh Edition Unix this fall, I stumbled upon a service list from DEC fo...
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 ……
I wrote a couple of years ago about the troubles I had finding a good libc for embedded systems , and for the last year or so I've been using something I called 'newlib-nano', which was newlib with the stdio from avrlibc bolted on. That library has worked pretty well, and required very little work to ship.
tl;dr; Redis is 16 times faster at reading these JSON blobs.*
If you need to handle really a lot of traffic, there’s only one way to do it: sharding. Which is to say, splitting up the incoming requests among as many hosts (or Lambda functions, or message brokers, or data streams) as you need. Once you get this working you can handle an essentially unlimited request volume. Of…
Designing far memory data structures: think outside the box Aguilera et al., HotOS’19 Last time out we looked at some of the trade-offs between RInKs and LInKs, and the advantages of local in…
Reports that some AVID Users Macs would no longer boot. It now may be that a Google Chrome Keystone update modifies /var on NON SIP Protected Macs.
