[TUHS] Re: kernel boots kernel in 1977

This may be a dumb question (in which case, my apologies), but which part of booting a PDP-11 UNIX was slow? And thus, which parts did he bypass in a 'quick reboot'? (I'm having a bit of a hard time working it out.) I can think of the following stages as potentially being 'slow': 1 - reading in the kernel image from disk 2 - sizing/clearing main memory 3 - loading running /etc/init 3A - creating all the 'loqin's 3B - starting all the daemons/etc with /etc/rc (There's obviously a conflict between 2 and 3*; one can't avoid 3* if one does 2.) Which ones did he want to avoid? Avoiding 3* puts some limitations on the system, obviously, because it means one has to keep running processes around; the process table has to have the same format (and be in the same location - or it has to be moved before the new system is started). (Technically, I guess one would have to save the inode and file tables, too; there isn't enough saved data in the kernel to re-open files, plus there are file read/write ocation pointers, etc.) One could sort of do 2 also, if one were prepared to 1) swap all processes out to secondary storage before 'rebooting', and ii) saving the process table. Are you talking about for UNIX, or across all operating systems? I don't have that broad a memory any more, to know - did TWENEX have something like that? Noel