Emacs maximum buffer size

Emacs maximum buffer size

Yes, I also guess that the buffer size limit comes from the limited word size combined with needing some bits for Lisp tags. I just made a few experiments:

• Starting a 32-bit Emacs on a 159MB file: "Maximum buffer size exceeded".
• Starting a 32-bit Emacs on a 127.1MB file: works, and that emacs then has a VSZ of 137MB and an RSS of 134MB.
• Starting a 64-bit Emacs on an 784MB file: works.

It's not a guess, it's a fact, and even a documented one :)

Perhaps it sucks a bit, but it's essentially irrelevant on 64-bit 
platforms unless Emacs starts to use a whole *lot* more bits for tags...