Path: utzoo!attcan!uunet!wuarchive!uwm.edu!rpi!batcomputer!cornell!vax8530!umh
From: umh@vax5.cit.cornell.edu
Newsgroups: comp.sys.mac.system
Subject: <None>
Message-ID: <4971.26b979e5@vax5.cit.cornell.edu>
Date: 3 Aug 90 17:19:33 GMT
References: <909@sppy00.UUCP>
Distribution: na,comp
Lines: 53

In article <909@sppy00.UUCP>, glf@sppy00.UUCP (HILL GREGORY L.) writes:
> A few weeks ago, during all the talk about having a System Heap size big 
> enough to have 25% free space in it, someone posted a way to increase the 
> System Heap size by using SUM II TOOLS.
> 
> I decided to give it a try.  (Running MultiFinder) I opened the About
> Finder dialog and saw ... (with the [ ] as the box, the ||| as the dark, 
>                            filled in part and the :: as the empty 
>                            [available] part)
> Finder 6.1
> System 6.0.3
> Total Memory 2,560K      Largest Unused Block: 1,536K
> Finder:  160K  [||||||:::]
> System:  864K  [||||||||||||||||||||||||:]
> 
> Hmm, says I.  Doesn't look like 25% to me.  So, I open SUM TOOLS, Edit
> Volume Boot Blocks, change System Heap size[512K] from about 168000 (I think
> that's what it was) to 300000 (after several attempts), Write Boot Blocks, 
> Quit and ReStart.
> 
> Now I look and About Finder and see ...
> 
> Total Memory 2,560K      Largest Unused Block: 1,533K
> Finder:  160K [||||||:::]
> System:  867K  [|||||||||||||||||||||||||]
>                                         ^
> WHAT?  System usage is up only 3K, *AND* now the box is more filled in
> that before!
> 
> I'll admit to being a bit novice in all this.  Since System size is
> showing 867K and Heap size is set to only 200K, does that mean that the system 
> is pre-allocated the 200K and the other 667K are being allocated on the fly?
> (And that's why there's never any space left over ... it's getting only as
> much as it needs.) If that's so, does that mean that if I want 25% more than 
> the 867K that I need to change Heap size to 1 MEG?!?
> 
> I've got a standard Mac Plus and have about 10 INITS ... very standard, stable 
> stuff from little things like Safe Eject to ATM and Type Align.
> 
> Any help or info greatly appreciated.
> 
> Thanks,
>    Greg
> -- 

MultiFinder does it's own memory management after it's kicked in, ignoring that  
field. What it's necessary for is in Finder. To check out how things change
when you do those changes in SUM, use Finder. You only need to change the
system heap size for multifinder use if you have lots of INITs cause those are
loaded in the "Finder" stage of a boot before Multifinder and can chew up all
the sy stem heap.

Maynard Handley