🚀 go-pugleaf

Henry Spencer:
>"Virtual memory", strictly speaking, refers to memory that acts like it's
>always there but sometimes isn't.

I would quibble slightly.  To me, virtual memory refers to a memory space
that is different than the physical memory of the machine.  A PDP-11
has a virtual memory space of 2^16 bytes, or perhaps 2*2^16 bytes.  But
some models of the machine have a physical memory space of nearly 2^22
bytes.

This is not what most people - including me - usually mean when casually
talking about virtual memory.  Then, it does refer to a virtual space that
is larger than the available physical space (available either because
the remainder is allocated to other uses, or not physically present),
and is managed by some technique like demand paging that allows partly-
resident processes to execute.

-- 
Ed Gould                    mt Xinu, 2560 Ninth St., Berkeley, CA  94710  USA
{ucbvax,decvax}!mtxinu!ed   +1 415 644 0146

"A man of quality is not threatened by a woman of equality."