Re: [NTG-context] lots of luatex process/instances (ps xa| grep lua / top -----sort by memory)

On a small example : ctrl+C works, ctrl+Z leaves unkillable (either -15 or -1) luatex and texlua process.

Again, that's because Ctrl+Z, in a normal Unix environment, only suspends the process, it never kills it. Try kill -19 first (SIGCONT), then kill -15 or -1. You can try the following experiment: run a small example file with an error and type Ctrl+Z. You may think you exited the process, but now type "fg". You should recover the LuaTeX run in the exact state you left it. It has not been killed. Arthur