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    Archive for the 'Links' Category

    Interesting and relevant links I found.

    Raspberry Pi Colocation service

    29th December 2016

    Exactly what the title says: Raspberry Pi colocation service, yay! At only 30 EUR/year as of this writing.

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    Posted in Links | No Comments »

    Mail-in-a-box, Sovereign, Modoboa, iRedMail, etc

    28th December 2016

    Preparing to dismantle my physical server (and move different hosted things to one or more VPS),
    I’ve realized that an email server is necessary: to send website-generated emails, and also
    receive a few rare contact requests arriving at the websites.

    My current email server was configured eons ago, it works well,
    but I have no desire to painfully transfer all the configuration…
    Better install something new, shiny and exciting, right? :)

    I had 3 #self-hosted, #mail-server bookmarks:

    (Sovereign, the 4th one, was addded after reading more about Mail-in-a-box.)

    Here are my notes on what seemed important about these 4.
    Read the rest of this entry »

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    Posted in *nix, Comparison, Links, Notepad, Software, Web | 3 Comments »

    The sugar conspiracy

    19th June 2016

    A long but interesting read: The Sugar Conspiracy.

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    Posted in Links, Misc, Science, Society | No Comments »

    TSW-friendly task and note management software

    5th June 2016

    A while ago I was looking for GTD/TSW-compatible android app.
    I ended up using Trello, Keep, and Calendar.

    But I always keep looking for new/improved tools, as right now I feel the best one does not exist…
    (If the best one can exist at all – requirements and conditions change all the time, so there is no fixed perfect immovable target.)

    I have been contemplating trying out the TSW methodology, but neither Keep nor Trello are quite there yet.
    I ended up using Evernote; after recent management changes and actually trying to become profitable it may as well last long enough.

    Everything was fine and calm until I have found workflowy yesterday.
    In essence, it is very similar to the text-file-based system that I have been using for at least half a year.

    Briefly, it is a web-based text editor on steroids, with possibly infinite nesting lists and seemingly full keyboard shortcuts control – no mouse needed.
    I recommend that you try the demo – it seems to be fully functional, and there is no need to sign up.

    This discovery made me read through pages and pages of this class of software tools.
    Here is a very brief summary of my findings: Read the rest of this entry »

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    Posted in Links, Misc, Notepad, Software | No Comments »

    Recommended: “Parasyte: The Maxim”

    30th January 2016

    Parasyte: The Maxim (2014) on IMDb

    This anime is the best that I have watched since (all seasons/full features of) Ghost in the Shell. In fact, I like this one more than Steins;Gate – which I can also recommend, but it takes patience to watch the first 3-4 episodes. With Parasyte, no patience is necessary: it is a very smooth flow from the very start until the very end. Luckily, season 1 is all there is. Just like with the legendary single season of Firefly :)

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    Posted in Links, Movies | No Comments »

    PGF vs PNG vs JPEG 2000 for long-term photo storage/archive

    26th May 2015

    I am using an excellent photo-management suite digiKam, which offers 3 lossless compressed formats for photos versioning and storage: PNG, JPEG 2000, and PGF. I wanted to know which one should I use, which urged me to perform this comparison.

    This post is not intended to be an in-depth comparison, but should be sufficient to choose one of the three file formats for your purposes. For more format details and history simply follow the links provided. File formats are reviewed roughly in “historical” order.

    PNG (Portable Network Graphics) was designed as GIF replacement.

    • It is lossless.
    • It is suitable for photos.
    • PNG is more space-efficient in the case of images with many pixels of the same color, such as diagrams/plots (as compared to PGF and JPEG2000). However, PNG photos are almost always larger than lossless PGF/JPEG2000 photos (real photo example: 9.9 MB in PNG, 7.0 MB in JPEG 2000).
    • PNG is fairly fast at (en|de)coding.
    • PNG is widely supported by web-browsers, image editors, and other software.
    • PNG uses CRCs internally for each data block, so if damage occurs only the damaged block(s) should be lost – theoretically. However, in practice, according to the Just One Bit paper (local copy), PNG is actually much less damage-resilient than JPEG 2000.

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    Posted in Comparison, Links, Misc, Software | No Comments »

    Compressors galore: pbzip2, lbzip2, plzip, xz, and lrzip tested on a FASTQ file

    28th March 2015

    About 2 years ago I had already reviewed some parallel (and not) compressing utilities, settling at that time on pbzip2 – it scales quasi-linearly with the number of CPUs/cores, stores compressed data in relatively small 900k blocks, is fast, and has good compression ratio. pbzip2 was (and still is) a very good choice.

    Yesterday I got somewhat distracted, and thus found lbzip2 -

    an independent, multi-threaded implementation of bzip2. It is commonly the fastest SMP (and uniprocessor) bzip2 compressor and decompressor

    - as it says in the Debian package description. Is it really “commonly the fastest” one? How does it compare to pbzip2? Should I use lbzip2 instead of pbzip2?

    This minor distraction had grown into a full-scale web-search and comparison, adding to the mix plzip (a parallel version of lzip), xz, and lrzip. After reading thousands of characters, all of these were put to a simple test: compressing an about 2 gigabyte FASTQ file with default options.

    All the external links and benchmarks, as well as my own mini-benchmark results, are provided below.

    The conclusion is that out of all the tested compressors lbzip2 is indeed the best one (for my practical use). It is only slightly better than the trusty pbzip2, which takes the second place. All the other compressors performed so poorly, that they do not get any place in my practical rating…

    So, let us first ask internet wisdom/foolishness, if lbzip2 or pbzip2 is faster/better?
    Read the rest of this entry »

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    Posted in *nix, Comparison, Links, Misc, Software | 6 Comments »