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OSS Leftovers

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  • A Diatribe Concerning My Experiences With Gopher

    This is an article that will collect my opinions concerning Gopher experiences and practices, primarily those I dislike, with regards to conventions I've encountered and whatnot. I'll update this article as I have more to write of and feel the want.

  • A Look at the Open-Source Tools Behind Today’s State-of-the-Art Visual Effects

    Today, Software Defined Visualization (SDVis) is the ultimate in the world of visualization, allowing the best-of-the-best to emerge. It’s hardly a secret in the world of scientific visualization, digital animation, and computer graphics (CG). Go to any hit movie these days, and the results of SDVis will be present to help make the incredible believable.

  • Arturo Borrero González: Netfilter workshop 2019 Malaga summary

    This week we had the annual Netfilter Workshop. This time the venue was in Malaga (Spain). We had the hotel right in the Malaga downtown and the meeting room was in University ETSII Malaga. We had plenty of talks, sessions, discussions and debates, and I will try to summarice in this post what it was about.

    Florian Westphal, Linux kernel hacker, Netfilter coreteam member and engineer from Red Hat, started with a talk related the some works being done in the core of the Netfilter code in the kernel to convert packet processing to lists. He shared an overview of current problems and challenges. Processing in a list rather than per packet seems to have several benefits: code can be smarter and faster, so this seems like a good improvement. On the other hand, Florian thinks some of the pain to refactor all the code may not worth it. Other approaches may be considered to introduce even more fast forwarding paths (apart from the flow table mechanisms for example which is already available).

    Florian also followed up with the next topic: testing. We are starting to have a lot of duplicated code to do testing. Suggestion by Pablo is to introduce some dedicated tools to ease in maintenance and testing itself. Special mentions to nfqueue and tproxy, 2 mechanisms that requires quite a bit of code to be well tested (and could be hard to setup anyway).

    [...]

    After lunch, Pablo followed up with a status update on hardware flow offload capabilities for nftables. He started with an overview of the current status of ethtool_rx and tc offloads, capabilities and limitations. It should be possible for most commodity hardware to support some variable amount of offload capabilities, but apparently the code was not in very good shape. The new flow block API should improve this situation, while also giving support for nftables offload. Related article in LWN: https://lwn.net/Articles/793080/

    Next talk was by Phil, engineer at Red Hat. He commented on user-defined strings in nftables, which presents some challenges. Some debate happened, mostly to get to an agreement on how to proceed.

  • QMO: Firefox Nightly 70 Testday, July 19th

    We are happy to let you know that Friday, July 19th, we are organizing Firefox Nightly 70 Testday. We’ll be focusing our testing on: Fission.

  • This free open-source tool can help game developers make procedural ivy [Ed: Mono is a problem]

    This is a tool specifically for games being made in Unity, an engine which has been used to make plenty of games people don't associate with it—games like Hearthstone, Cities: Skylines, Wasteland 2, Beat Saber, and Cuphead, for instance, were all made in Unity.

  • Popular licenses in OpenAPI

    Note: Before you start complaining, I realise this is probably a very sub-optimal solution code-wise, but it worked for me. In my defence, I did open up my copy of the Sed & Awk Pocket Reference before my eyes went all glassy and I hacked up the following ugly method. Also note that the shell scripts are in Fish shell and may not work directly in a 100% POSIX shell.

    First, I needed to get a data set to work on. Hat-tip to Mike Ralphson for pointing me to APIs Guru as a good resource. I analysed their APIs-guru/openapi-directory repository1, where in the APIs folder they keep a big collection of public APIs. Most of them following the OpenAPI (previously Swagger) specification.

  • Infinite work is less work
    The first task of last week's Perl Weekly Challenge was to print the
    first ten strong and weak primes. A prime pn is "strong" if it's larger
    than the average of its two neighbouring primes (i.e. pn > (pn-1+pn+1)/2).
    A prime is "weak" if it's smaller than the average of its two neighbours.
    
    Of course, this challenge would be trivial if we happened to have a list
    of all the prime numbers. Then we'd just filter out the first ten that
    are strong, and the first ten that are weak. In fact, it would be even
    easier if we happened to have a list of all the strong primes, and a
    list of all the weak ones. Then we'd just print the first ten of each.
    
    But there are an infinite number of primes and of weak primes (and
    possibly of strong primes too, though that's still only conjectured),
    so building a complete list of the various subspecies of primes 
    is impractical in most programming languages.