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The most popular blog posts about systems & performance on Hacker News. 582 posts.
Technical Report APA-TR-2006-1201; Title: Almaz S-300P/PT/PS/PMU/PMU1/PMU2 / Almaz-Antey S-400 Triumf / SA-10/20/21 Grumble/Gargoyle ; Abstract: Introductory technical analysis and development history of the Almaz-Antey S-300P family of Surface to Air Missile systems. Includes diagrams, imagery and variant tables…
Fun with LapLink 5 and parallel port file transfers under FreeDOS
An article explaining why Xen wasn't affected by the recent RETBleed security issue on Intel CPUs.
A blog by and for database architects.
r/PBSOD is a fun subreddit all about posting pictures of broken kiosks and information/entertainment systems in public. It stands for Public Blue Screen of Death which is a Windowsism but Linux systems are posted there too. If you spend enough time scrolling, you might notice two things: There’s a scary number of…
Message signaled interrupts or MSIs describe a way to signal an interrupt without a dedicated interrupt request pin (IRQ). One of the most prevalent uses for MSIs is the PCI bus, and the PCI specification defines the MSI and MSI-X standards. The potential benefits may include: (1) reduced number of direct wires from…
The UNIX fork() system call seems like an elegant way to process tasks in parallel. It creates a copy of the current process, allowing tasks to read the same memory, without needing fine-grained synchronization. Unfortunately, you need to use it extremely carefully in large programs because fork in a multi-threaded…
ZFS is a hybrid filesystem and volume manager system that is quite popular recently but has some important and unexpected problems.
Let's start at the beginning: it all started with me trying to boot a system which receives its initial ramdisk over XMODEM.
In my last post I introduced an Emacs Lisp VM I was writing in Rust. My stated goal at the time was to complete a garbage collector. I think Rust has some really interesting properties that will make building garbage collectors easier and safer. Many of the techniques used in my GC are not original and have been…
When I started thinking about writing a post about web font loading my intention was to propose relatively sophisticated ideas that I've...
MS-DOS game programmers had to deal with several limitations. This article goes over some of these obstacles and explores how we used the DOS/4GW extender & protected mode to unleash the power of 32-bit DOS.
By the metric of
Typically you either have an executable or a shared library, but can you have an executable shared library too?
The NetBSD Project is pleased to announce NetBSD 9.3, the third release from the NetBSD 9 stable branch.
Nowadays, there is increasing interest in adding tagged memory functionality to CPU architectures. Such architectures associate one or more tag bits with each quantum of a system's memory. There are many motivations for this ability to associate “metadata” with individual memory words, but one of the most clear is the…
So you decided to build a brand new system using all the latest and coolest tech, so you buy a Ryzen 7000 series Zen 4 CPU, like the Ryzen 7700X that I picked, with a new mother board and DDR5 memory
When programming, we often have to 'escape' strings. A standard way to do it is to insert the backslash character (\) before some characters such as the double quote. For example, the string my title is "La vie" becomes my title is \"La vie\" A simple routine in C++ to escape a string might look … Continue reading…
TLDR: ZFS free-space reporting is a lagging indicator. Background I use Proxmox VM server backed by a ZFS array of hard drives for various personal infrastructure. I also have security cameras that upload motion-triggered videos to my server (via FTP!). Problem Description I would like to use 90% of my available space…
The Network Time Protocol (NTP) is a system for synchronizing the clocks of hosts and clients across the Internet. NTP is a protocol intended to synchronize all computers participating in the network to within a few milliseconds of Coordinated Universal Time (UTC). The core of the protocol is NTP’s clock discipline…
MicroShift has been specifically designed for edge computing use cases, with a goal of fitting in the limited storage capacity of field-deployed devices that can be embedded into a variety of appliances such as cars, factory lines, airplanes or even satellites.
I’ve been thinking about WebAssembly a lot lately.
Eliminating use-after-frees vulnerabilities in Chrome with heap scanning.
A large C++ codebase meets a new linker: The good, the bad and the performance improvements <a class="more-link" href="https://www.productive-cpp.com/using-the-mold-linker-for-fun-and-3x-8x-link-time-speedups/">... Read More</a>
I have been playing with some LTE recordings to brush up my knowledge, since it isn’t a protocol I’m very familiar with. I’m specially interested in understanding the structure and properties of all the pilot signals. Textbooks and documentation are great, but nothing beats getting your hands dirty with some IQ…
So unlike all the others, yet people think it's the normal one.
