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today's howtos and programming bits

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Development
HowTos
  • How to install the Writefull editor on Linux
  • Linux Find If Processor (CPU) is 64 bit / 32 bit [long mode ~ lm]
  • How to Install and Configure latest version of Ansible on Ubuntu Linux
  • How To Create a Database on InfluxDB 1.7 & 2.0
  • Step-by-Step Execution and Examples

    Last week I finished writing all the new examples for the ROCS, together with a little description of each commented in the beginning of the code

  • Applying C - Deadline Scheduling

    For real time tasks FIFO scheduling is appropriate. However, if you are using a modern version of Linux there’s a better choice. Earliest Deadline Scheduling (EDS) is new recently introduced (Kernel 3.14) Linux scheduling policy. Due to its recent introduction and because it isn’t a POSIX scheduling method, it isn't widely used, but it does have many good properties for realtime tasks.

    A SCHED_DEADLINE thread is associated with three parameters – runtime, period and deadline. The thread will receive runtime nanoseconds of execution every period nanoseconds and deadline specifies in nanoseconds how delayed into the period the allocation can be. If a thread takes longer than its runtime period the operating system suspends it and restarts it at its next activation period.

    It is also useful to know that in this case sched_yield suspends the thread until its next time period starts. This means you can give time back to the system if you have overestimated how long a task should take.

    Notice that times are specified in nano seconds (ns) but micro seconds (us) are more reasonable for describing how long a real world task is likely to take.

    For example, if runtime is 10 us, period 100 us and deadline 20 us you can be sure that the thread will get 10 us every 100us and the maximum delay from the start of the 100 us period is 20 us. If the thread is, say, setting a hardware line high at the start of the 10us and low at the end, the pulses will be 10us wide and repeat every 100us, but with a jitter of 20 us from the start of the 100us period, i.e. a pulse could be up to 20us late. This only works if the system isn’t overloaded and there are enough CPUs to satisfy all of the demands. As long as the system isn’t overloaded then the scheduling algorithm is proven to meet the specifications of period and deadline.

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.