Path: utzoo!attcan!uunet!lll-winken!ncis.tis.llnl.gov!helios.ee.lbl.gov!pasteur!ucbvax!tut.cis.ohio-state.edu!mailrus!husc6!lloyd!kent
From: kent@lloyd.camex.uucp (Kent Borg)
Newsgroups: comp.sys.mac.programmer
Subject: Re: System 7.0 Q & A
Message-ID: <403@lloyd.camex.uucp>
Date: 18 May 89 22:23:38 GMT
References: <30353@apple.Apple.COM> <4666@okstate.UUCP> <1787@internal.Apple.COM> <7266@hoptoad.uucp> <1838@internal.Apple.COM>
Reply-To: kent@lloyd.UUCP (Kent Borg)
Organization: Camex, Inc., Boston, Mass USA
Lines: 44

In article <1838@internal.Apple.COM> lsr@Apple.COM (Larry Rosenstein) writes:

>I don't think the probability will change at all under 7.0.  There is one 
>large address space (up to 14 megabytes) and everything lives there.  
>There is no protection at all.

The virtual address map comes in two sizes.  14 meg for 24-bit
addressing, and some 2-ish number of gigabytes for 32-bit
addressing--at least that's what Apple said last week.

A gripe (sorry): There seems to be a very big duration-gap between the
memory we can ask for before we ever start running (in our SIZE
resource we should be frugal) and the MultiFinder temp memory which we
might discover once running, but are not supposed to keep when calling
WaitNextEvent (yes, I know we can mark it as purgable and take our
chances...).

Is there a way we can check whether there is scads of unused memory
floating around which we could use to make the user happier?

Can you tell us more about the properties of MultiFinder temp memory?
Why should we not keep it for long periods?  When will it get purged
if marked purgable?  (BTW: I like that it is now real memory manager
memory.)  

What about this kludge: When the application finds itself running it
checks whether it has lots of memory available.  If it does it plays
with it's own SIZE resource and launches itself again--then sets its
SIZE back down?  Pretty bad, huh?

We need a better way to parcel out the available memory...

Just thought of another question: Can an alias for an application have
a SIZE resource?  

And another thing: When the 7.0 Finder discovers that my 4 meg. Plus
at home (I wish) does not have enough room for a 10 meg application,
will it ask me how much memory to use instead of just asking whether
sucking up everything is alright?

Kent Borg
kent@lloyd.uucp
or
...!husc6!lloyd!kent