2GB limit

[John Arbash Meinel]

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On 10/8/2010 1:09 AM, Maritza Mendez wrote:
> 
> 
> On Thu, Oct 7, 2010 at 8:41 PM, Martin Pool <mbp at canonical.com
> <mailto:mbp at canonical.com>> wrote:
> 
> 
>     This problem isn't inherent to Windows but I think Windows is the only
>     place where we don't use 64-bit addressing even when the system
>     supports it.
> 
> 
> 
> Aha.  Now I think I see.  Thanks.  I will read some of the threads in
> which peole have tried to build for Windows x64 and see if I have any
> ideas.  Thanks.

I think there are a couple of issues. One is that 'pack' is allocating
~5x the largest content. So auto-packing has a high peak memory requirement.

And 64-bit at least allows us to allocate more memory blocks. (So if
your machine has 4GB we aren't stuck at the 2GB barrier.)

The next issue will be handling content >2GB and then again at content
>4GB. The delta structures, etc, have certainly not been audited for
working correctly at that level. Note that 'content' may not be a single
file, because of how we combine texts, though it would be close to that
(within 2-4x sort of thing).

John
=:->
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