howtf.io

series

series2 parts

Linking & Loading

  1. Part 1: howtf does ./app reach main()? — Feb 16, 2026
  2. Part 2: howtf can a device be both present and not found? — Jul 13, 2026
series3 parts

Memory Registration, All the Way Down

  1. Part 1: howtf does a NIC write directly into GPU memory? — Aug 20, 2026
  2. Part 2: howtf did a GPU memory-registration error come from host RAM? — Aug 23, 2026
  3. Part 3: howtf can pinned memory still need to move? — Aug 25, 2026