Félix Saparelli


a.k.a. passcod

Monthly Update

Posted on Feb 10 ‘17

This is a monthly-update

It has one parent: Monthly Update


I’ve spent a lot of my weekends writing a Star Wars fanfic. I’m going to finish it before I publish, to avoid publishing and then abandoning it when I eventually realise I’ve written myself into a corner. It’s completely outlined, and I’ve got some willing and eager proofreaders waiting for it, so I have hope.

I’ve already got ideas for a sequel; if there’s interest I might be working on that for a while, too. The sequel will contain a certain ship.

No title as of yet, working title of my file was SW:E:SI at the beginning of the month, but what it stood for was already outdated by the time I got to the middle of the outlining, so I changed it to the non-commital “Master Kylo”. Maybe it will stay that.

300 Shorts

I’ve moved my “300 Shorts” collection entirely to this blog, instead of its previous home on Medium. I’ve also added an introductory post, which additionally serves as a common ‘parent post’ for all the shorts, taking advantage of my blog engine’s capabilities: it will add a link from each entry to the main post, and add a list (with links) of all the entries onto that main post.

I’ve also published two so-far-unpublished pieces from 2016 into this collection. The first is a short poem written last year: Unlit. The second is a sci-fi story originally written for a contest: Regulus. It is accompanied by a few pages of notes and commentary.


Chapter Seven made me really happy and I felt more bubbly than usual writing its comment. Perhaps it was the ice-cream.

Backup and Sync

Discovered a very interesting paper, algorithm, and software: MetaSync. It provides a sync utility that can store data across several services and even replicate this data for maximum reliability and synchronisation speed. I have yet to evaluate the solution in-depth for my needs, but it certainly sounds promising.

Ultimately, though, the software is not quite as maintained nor modern as I would wish it. For this reason, my next large Rust project will be to implement the pPaxos algorithm, the core metasync library, a CLI frontend and a sync Daemon, as well as some remote storage adapters (probably starting with Dropbox, Google Drive, MEGASync), and some local storage middleware (selective encryption, compression).

I’ll probably choose a different name, though, not only to avoid stepping on toes, but also because I don’t quite believe “meta sync” to be a good descriptor for what this does.


After several years (at least four, but it gets fuzzy before then) of quiet research and occasional thought, I finally got the last insight into my very own algorithm for hypergraphs (and their somewhat-optimised subset hypermaps).

My hypergraphs are optimised for a specific query: “give me all the vertices of all the edges that contain the given vertex.” Hyperion executes that for any arbitrary vertex with the same time complexity as the underlying substrate. For a HashMap, that’s O(1).

Hyperion is also fairly good at memory space: it incurs only a small fixed overhead per-vertex and per-edge. Other implementations of bimaps, hypermaps, or hypergraphs use about twice the amount of memory as is input into them.

Using Hyperion is mostly about thinking differently about some data. Once you understand that you essentially have a structure which can store associations of objects and then retrieve the entire association given any value within, in constant time… once you really understand the idea and start being able to apply it to problems, that’s when it becomes interesting.

Hyperion is not quite ready for publication, but the concept is finished and a full description of its algorithms — for insert, for query, for modification — is done in pseudocode. An initial implementation in Rust, some analysis, a few measurements, and better documentation remain to be completed.


All in reading order within their sections. Word counts are rounded to nearest 1 or 5k. I explored the Harry Potter fanficdom, fics rated at least T, often M. Contains occasional lemons. Fairly large proportion of Haphne.

Also enjoyed, but no lengthy comment:

I read a lot of Bobmin’s stories around the middle of January, to honour his rich contribution to the fandoms. These are all excellent: