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From: merlin@hqda-ai.UUCP (David S. Hayes)
Newsgroups: comp.unix.wizards
Subject: Re: rlogin in background strangeness.
Message-ID: <424@hqda-ai.UUCP>
Date: Thu, 10-Sep-87 21:22:04 EDT
Article-I.D.: hqda-ai.424
Posted: Thu Sep 10 21:22:04 1987
Date-Received: Sat, 12-Sep-87 11:29:45 EDT
References: <2850@phri.UUCP> <7997@mimsy.UUCP> <872@mcgill-vision.UUCP>
Organization: Army AI Center, Pentagon
Lines: 19
Summary: File system in memory has been done.

1.  The Sun-4 does have ECC (error-correcting core) memory.
So, for that matter, do the Sun-3/2xx systems.  Mine 3/280 has 8
megs, and has been running for almost 3 months, without even
correctable error.

2.  There is a system with the file system in memory, sort of.  In
the Xerox lisp machines, there is no regular file system.  There
are only "objects", which are memory-resident.  The system saves
"worlds" on the disk (in addition to VM paging space).  A world is
merely a copy of the virtual memory space.

3.  300 megabytes is not sufficient as a design limitation.  Most
people won't need that much, of course, but some need more.  I
have 14 lisp machines here.  Most have at least 400 megabytes of
paging space, and several have over 1000 megs!  Even so, some
applications have to be split over several machines via remote
procedure calls.
-- 
David S. Hayes, The Merlin of Avalon	PhoneNet:  (202) 694-6900
UUCP:  *!uunet!cos!hqda-ai!merlin	ARPA:  merlin%hqda-ai@mimsy.ue, a.