@User @User the compile parameter i once changed was for a different thing, that is, the max lenght of netlist lines when executing a '`listing`' command in interactive ngspice prompt. About your problem, @User i think ngspice tries to guess the size of resident memory on the system and exit if all memory is being exhausted. This happens in interactive mode, where all simulation data is kept in memory and eventually saved (with a ngspice write command). If you start ngspice in batch mode (no interactive commands) then the raw file goes directly to disk, and no in-memory data is kept.