Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!CIM-VAX.HONEYWELL.COM!derstad
From: derstad@CIM-VAX.HONEYWELL.COM ("DAVE ERSTAD")
Newsgroups: comp.sys.apollo
Subject: Re:  Mentor Graphics Mspice.020 server
Message-ID: <9002061400.AA03716@umix.cc.umich.edu>
Date: 6 Feb 90 13:45:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 30


>  When the server starts, it takes about 20 Mb on the disk !!!

This is neither a bug nor a feature of the Mspice server, but
is a side-effect of Aegis being trashed in favor of JLRU.

Under "real Aegis", if a large amount of virtual memory was 
allocated, it did not take up disk space until some item in
a particular page was touched.  Then, that page was mapped
to disk.  The advantage is that programs with large static
data structures which don't use them except for very large
problems can still run on smaller machines.  Of course, a 
program can also run out of disk space part way through 
execution, but I'd personally prefer that.

With JLRU, disk space for all virtual memory is allocated 
immediately.

Spice is a dusty-deck FORTRAN program with large COMMON 
blocks.  When you invoke Spice, disk space is allocated
to store the contents of the COMMON blocks.

This doesn't help, but at least now you know why...

Dave Erstad
DERSTAD@cim-vax.honeywell.com
Honeywell SSEC

Where, oh where, has my Aegis gone?  Oh where, oh where can
it be?