Re: NSArray: Problem allocating memory on stack on windows

[Richard Frith-Macdonald]

On Tuesday, October 14, 2003, at 04:26 PM, Frederic Stark wrote:

> Hi,
>
> Roland Schwingel wrote:
>
> > Also a good idea.... In our tests we got problems with arrays >52000
> > elements.
> > As of the fact that the stack might be longer in some cases, it might 
> > be
> > good
> > enough to set the limit to about 32768 (isn't that a fine number)?
>
> I don't think 32768 is a good choice:
>
> 1/ It let casual reader of the code thinking that it may have 
> something to do with 2^15. He'll start to worry that, maybe, therte is 
> a signed 2 byte number somewhere.
>
> 2/ It is way too big, as it would use more than half of the stack.
>
> I would suspect that the good number is around 100.

There is now some experimental code in NSArray.m in CVS to use the heap 
for numbers of objects above 1000 (an arbitrary choice).
It uses a couple of new macros which will probably eventually make 
their way to GSObjCRuntime.h once we've picked better names
and decided on a good number ... perhaps nearer 100.