OpenTTDLab

I am looking at https://github.com/michalc/OpenTTDLab/blob/main/examples/02-... and wondering if this isn't hyperthreading being enabled. If you have 4 real cores, with 2 hyperthreads, the system reports 8 CPUs. But that's fake. Hyperthreads share most of their compute and register resources, so they only work well if a core is spending most of its time waiting. 2 hyperthreads both doing full compute will basically work at half speed each, which is close to what your graph is showing. BTW, you can check on Linux with this command LANG=C lscpu and checking the Thread(s) per core value

I have posted this before, but I’ve been working on a wrapper for OpenTTD to turn it from a game to a (slightly!) more serious system for research/experimentation, especially using its AI system: https://github.com/michalc/OpenTTDLab

Related: I recently made OpenTTDLab https://github.com/michalc/OpenTTDLab that can run OpenTTD headlessly from Python and extract data from its savegames in a hopefully fairly straightforward way. (Very recently posted on ShowHN, so maybe this is cheeky…)