Re: 64-bit apps [was Re: NSUInteger question]
Re: 64-bit apps [was Re: NSUInteger question]
- Subject: Re: 64-bit apps [was Re: NSUInteger question]
- From: Bill Bumgarner <email@hidden>
- Date: Wed, 9 Apr 2008 14:23:20 -0700
On Apr 9, 2008, at 2:17 PM, Nick Zitzmann wrote:
2. Since there aren't a whole lot of 64-bit apps out there, when
some users see them using more memory, they tend to think
something's wrong with the app. This is especially true if GC is
also turned on, as it is in 64-bit Xcode, and the VM requirement
swells to 30+ GB. I don't remember why turning GC on does this.
The collector reserves a 32GB zone of addresses to serve up scanned
allocations (the autozone).
It is only allocating addresses and not actually touching all of that
memory. Thus, it bumps the address space by 32GB, but does not
actually use 32 GB of memory or VM.
b.bum
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