Today I Learned that the default stack size for threads in dotnet e.g. the ThreadPool threads is OS dependent. On Windows it is 1.5 MiB, on Linux, MacOs it is dependent on the concrete OS version. To determine the actual default thread size you have to run ulimit -s. For Ubuntu 22.04 it is 8192 bytes and for macOS 14.2 it is 8176 bytes. It is possible to configure the default stack size via environment variable e.