Posts

On the past few days this tweet caused some confusion and interest on how CPU caches work. The tweet asks which of the following options is faster: A. for (int i = 0; i < n; i += 256) a[i]++; B. for (int i = 0; i < n; i += 257) a[i]++; The question is taken verbatim from Algorithmica, but not given credit, not cool. Algorithmica also provides a very good explanation, although in my opinion a little convoluted, and misses an important part, so I will try to simplify it. ...

I’ve worked with maps on the web for the past year or so, using maplibre-gl as my library of choice, this library supports vector maps, which in my opinion feel much better than usual rasterized maps. Unfortunately, there is no freely available tile server for vector tiles, which brought me to host my own. The process is very simple, I host them in both a 4€/month Hetzner VPS, and in my closet home server. ...

I’m working at a public transit company, we need to print schedules to place on the stops, the current system was broken, took 3 days to generate all the PDFs, and was hard to modify. I was tasked with creating a new system for printing a schedule for bus line passing at a certain stop. The new setup generates about 30 PDFs per second, which is a significant improvement over the previous system. The new system is open source, and can be checked out here ...

My girlfriend needed PyTorch and Tensorflow for a machine learning course she’s taking. I have an RTX 3070 and she has a laptop with an integrated GPU. Models took forever to run, I wanted to help. I took multiple days to figure out how to get it working, and I’m here to save you the trouble. The install with the guide took 10~ minutes on a friend’s computer, almost all of it spent waiting for downloads. ...