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Programming Leftovers

Submitted by Roy Schestowitz on Sunday 24th of April 2022 01:15:03 PM Filed under
Development

  • nablet Releases JPEG XS SDK to Create Workflows Based on Powerful New Video Standard

    nablet has released itsJPEG XS SDK, making it easy to implement the powerful JPEG XS format, co-authored by Fraunhofer IIS. The SDK is available now, for Linux and Windows, and nablet will release additional technologies powered by JPEG XS.

  • Interacting with FreeBSD: Fundamentals of the FreeBSD Shell

    A shell is software that allows people to interact with their operating system. Before graphical displays with windows and mice existed, early shells were created where computer operators would type simple commands at the keyboard to launch applications.

    Although some see the shell as “primitive,” this manner of interacting with a computer is extremely flexible and expressive. The command-line shell thus lives on as a quintessential element that defines Unix systems. There are many shells to choose from, but they have many things in common—these commonalities reflect features that go back to the early design of Unix and the fact that the shell has always been deeply embedded.

    There are two shells included in the FreeBSD base system – sh and csh – corresponding to evolutions of the Bourne and C shells. Early on, the consensus was generally that the Bourne shell was the better shell for scripts and programming while the C shell was a better interactive shell. These strengths also influenced subsequent developments. Many innovations for interactive shell use were added first in tcsh, a fork of csh that can be considered its natural successor. Similarly, the Korn shell is built on the foundations of the Bourne shell, primarily adding features more commonly associated with programming languages.

  • The state of Python (both 2 and 3) in Ubuntu 22.04 LTS

    Ubuntu 22.04 LTS has just been released and is on our minds, because we have a lot of Ubuntu 18.04 machines to upgrade to 22.04 in the next year. Since both we and our users use Python, I've been looking into the state of it on 22.04 and it's time for an entry on it, with various bits of news.

  • He Tested Many Locks. See What Happened Then! - LFlat, The Home of Vrurg

    These clickbaiting titles are so horrible, I couldn’t stand mocking them! But at least mine speaks truth.

    My recent tasks are spinning around concurrency in one way or another. And where the concurrency is there are locks. Basically, introducing a lock is the most popular and the most straightforward solution for most race conditions one could encounter in their code. Like, whenever an investigation results in a resolution that data is being update in one thread while used in another then just wrap both blocks into a lock and be done with it! Right? Are you sure?

    They used to say about Perl that “if a problem is solved with regex then you got two problems”. By changing ‘regex’ to ‘lock’ we shift into another domain. I wouldn’t discuss interlocks here because it’s rather a subject for a big CS article. But I would mention an issue that is possible to stumble upon in a heavily multi-threaded application. Did you know that Lock, Raku’s most used type for locking, actually blocks its thread? Did you also know that threads are a limited resource? That the default ThreadPoolScheduler has a limit, which depends on the number of CPU cores available to your system? Worse, it used to be a hard-coded limit of 64 threads a while ago.

  • Perl Weekly Challenge 161: Abecedarian Words and Pangrams
  • How to avoid sleep in Rails system tests

    Writing system tests can be sometimes tricky because we want to assert a reality that’s not yet rendered. Ad-hoc sleeping is something that can mostly address the problem, but it’s not the most elegant solution and should be avoided if possible.

  • Update on Learntla and a new writing process

    So I’m not providing the entire spec I wrote, because that would be too confusing for the reader. But it’ll still be more interesting.

    Techwise I’m pushing hard on using semantic text for writing documentation. All my earlier TLA+ material was in Markdown, which I’ve had many, many problems with. I tried semantic text for the Alloydocs and it really helped; this is now my most serious attempt. And so far, it’s paying off! It makes maintaining the content easier, and I also hope it’ll present better content.

  • An overview of version control in programming

    In practice, computer code is constantly being transformed. At the beginning of a project, the computer code often takes the form of sketches that are gradually refined. Later, the code can be optimized or corrected, sometimes for many years.

    Soon enough, programmers realized that they needed to not only to store files, but also to keep track of the different versions of a given file. It is no accident that we are all familiar with the fact that software is often associated with versions. It is necessary to distinguish the different versions of the computer code in order to keep track of updates.

  • Postponing things is good

    At one point a few years into my GTD journey, I actually managed to do it all, to reach zero, and nothing happened. No fanfare, no oboe. So that’s no longer my goal. My goal is to select the right things to work on out of these ideas the lists so dutifully catalogue.

  • Fell to PICO-8

    A few months ago I was planning on learning lua as a first language, but got sidetracked with other stuff in life, but now I'm picking up where I left off. Before and now I've decided that a fantasy console was the way I wanted to get start making games, and chose the 2nd most popular, open source TIC-80. But now that I take a look at it, there really isn't a whole lot of tutorials/courses for the console. The only quality (in my opinion) beginner series is the one from Bytes N Bits where you follow along creating space invaders.

»

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

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