I'm David Llewellyn-Jones and this is my homepage. I'm a software engineer at Jolla, who's also interested in programming, security, privacy and graphics. I occasionally crave adventure and a good thunderstorm. You might be interested in my software, my research or my random musings.

Want to know more about me? Here's a personality sketch written by a psychologist when I was in school.

“David is of high intelligence, although lacking in true creativity. He has a need for order and clarity, and for neat and tidy systems in which every detail finds its appropriate place. His writing is rather dull and mechanical, occasionally enlivened by somewhat corny puns and by flashes of imagination of the sci-fi type. He has a strong drive for competence. He seems to have little feel and little sympathy for other people and does not enjoy interacting with others. Self-centered, he nonetheless has a deep moral sense.”

Wow. Harsh. But disturbingly accurate.

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25 Jul 2022 : Belated 2021 carbon offsetting #
Better late than never, I've posted on my blog about my 2021 carbon offset.
23 Jul 2022 : Now! #
I updated my Now page. So now it's a bit less then and a bit more now.
2 Jul 2022 : Waste data dump #
Mouldy bread! Aaargh, I do dislike it. Most of my waste output was okay this fortnight, the exception being my compost waste, which shows a noticeable spike, all because of an outbreak of mouldy bread in my cupboard. Very frustrating. You can see it all in the graphs on my waste page, but the summary result is an average daily waste output for the fortnight of 142.15 g, which frustratingly is slightly higher than my average for the year, all because of that mouldy bread.
19 Jun 2022 : Waste data dump #
Time for my fortnightly-ish waste data dump again. The latest numbers have been added to the waste page. This fortnight I somehow managed to keep my waste output relatively low: 106.47 g/day on average, lower than my current average for 2022 of 135.62 g/day, There were no big standout values in the category, most of which were around average or below. So I'm not really sure how I managed to be more frugal than usual. Maybe being back in the office means lower lunch-related waste?
3 Jun 2022 : Waste data dump #
Another waste data dump to the waste page, this time covering two periods (I forgot to upload the last set of data at the time, but it doesn't actually affect the graphs or data at all). In this last period there's a bit of an uptick in general and paper waste. The former, I suppose, because Joanna was visiting for part of the period, and the latter, I expect, because I recycled all of the notes from my Finnish class that took place during the first half of the year. Quite a lot of notes, as it turns out. Overall my latest daily average is a bit too high at 148.94 g. I'll need to work quite hard if my daily average for 2022 (currently at 138.88g) is to come down below my daily average for 2021 (119.88g). I might even need to figure out some kind of strategy.