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Free Software Leftovers

Submitted by Roy Schestowitz on Thursday 10th of June 2021 09:05:09 PM Filed under
Development
GNU
  • Faster image transfer across the network with zsync

    Those of us involved in building operating system images using tools such as OpenEmbedded/Yocto Project or Buildroot don't always have a power build machine under our desk or in the same building on gigabit. Our build machine may be in the cloud, or in another office over a VPN running over a slow residential ADSL connection. In these scenarios, repeatedly downloading gigabyte-sized images for local testing can get very tedious.

    There are some interesting solutions if you use Yocto: you could expose the shared state over the network and recreate the image, which if the configurations are the same will result in no local compilation. However this isn't feasible if your local machine isn't running Linux or you just want to download the image without any other complications. This is where zsync is useful.

  • Making CPython faster

    Over the last month or so, there has been a good bit of news surrounding the idea of increasing the performance of the CPython interpreter. At the 2021 Python Language Summit in mid-May, Guido van Rossum announced that he and a small team are being funded by Microsoft to work with the community on getting performance improvements upstream into the interpreter—crucially, without breaking the C API so that the ecosystem of Python extensions (e.g. NumPy) continue to work. Another talk at the summit looked at Cinder, which is a performance-oriented CPython fork that is used in production at Instagram. Cinder was recently released as open-source software, as was another project to speed up CPython that originated at Dropbox: Pyston.

    There have been discussions on and development of performance enhancements for CPython going back quite a ways; it is a perennial topic at the yearly language summit, for example. More recently, Mark Shannon proposed a plan that could, he thought, lead to a 5x speedup for the language by increasing its performance by 50% in each of four phases. It was an ambitious proposal, and one that required significant monetary resources, but it seemed to go nowhere after it was raised in October 2020. It now seems clear that there were some discussions and planning going on behind the scenes with regard to Shannon's proposal.

  • Multithreaded database access with QtSql

    Last time, we had a look at how to make the database access asynchronous with QFutures. Our solution was to use a one thread QThreadPool with QtConcurrent. That works pretty well for most of the use cases, but as mentioned previously there are some cases where you might want to use multiple threads in parallel to access the database. That case may be some sort of service, but it of course also works for all other kinds of applications.

  • LibreOffice Writer line heights: removing a 16bit limit

    Line heights in Writer are typically defined in points on the UI (e.g. 12pt), though they are measured in twips internally (1 point is 20 twips). This height was stored in a 16bit unsigned integer, so the maximum allowed height was 65536 twips, around 116 cm.

    Now we track line heights with 32 bits ints, so this limitation is practically removed.

    First, thanks Vector who made this work by Collabora possible.

  • PostgreSQL Weekly News - May 30, 2021

    pgSCV, a Prometheus-compatible monitoring agent and metrics exporter for PostgreSQL, released.

    Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26, a connection pooler and statement replication system for PostgreSQL, released.

    sqlite_fdw 1.2.0 released.

    Crunchy PostgreSQL Operator 4.7.0, a system for deploying and managing open source PostgreSQL clusters on Kubernetes, released.

    pgAdmin4 5.3, a web- and native GUI control center for PostgreSQL, released.

  • MCUboot Becomes A Linaro Community Project

    Linaro Community Projects Division, the division of Linaro managing open source community projects with open governance, has announced that the MCUboot project is becoming a Linaro Community Project, joining the already hosted projects OpenAMP and Trusted Firmware.

  • Peter Czanik: The syslog-ng Insider 2021-06: Alerting; EoL technologies; Google Summer of Code;

    This is the 92nd issue of syslog-ng Insider, a monthly newsletter that brings you syslog-ng-related news.

  • Google Working On Open-Sourcing Their Fibers User-Space Scheduling Framework

    For a number of years Google has developed Fibers (not to be confused with Google Fiber, their fiber Internet service) as a user-space scheduling framework. While it hasn't been open-source, the few public papers and talks on Google Fibers has been quite interesting for great performance and a novel design. Finally though Google is working towards open-sourcing Fibers and hoping to get the necessary Linux kernel modifications upstreamed.

»

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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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