Ok, further to this, I had some nice engineers at Apple give me some  
feedback on Virtual memory on the iPhone.  One thought was to look at
mincore -- determine residency of memory pages, refer to sys/mman.h  
because man page is incorrect,
So let's see what is up.

First I had to cleanup things a bit to ensure the VM or the image  
didn't march thru all the objects when starting up via allInstances.

After this, with a development image which is  5MB larger than the  
wikiserver image I found..

3937 pages to hold image file (old space, no young space).

2823 pages NOT in memory

139 pages MINCORE_INCORE
786 pages MINCORE_REFERENCED & incore
189 pages MINCORE_MODIFIED & incore  & referenced


So I'm sure Craig will grin, shades of work he is doing at the object  
level, but here we have a image
of 16,125,952 bytes,  but only 4,562,944 bytes (more or less) is  
active for what it's doing, anyway the
key effort was to avoid allInstances and a full GC at startup time so  
that we don't drag all  3937pages
into RAM from flash.


On 11-Apr-09, at 9:23 AM, John M McIntosh wrote:

>

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John M. McIntosh <johnmci at smalltalkconsulting.com>
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
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