I still use XCode in one location where I work on a core-solo Mini. Performance
is good. No problems at all, no pauses.
________________________________
From: Rob Keniger <r...@menumachine.com>
To: cocoa-dev Dev <cocoa-dev@lists.apple.com>
Sent: Friday, 26 June, 2009 12:20:48 PM
Subject: Re: GC pros and cons
On 26/06/2009, at 10:58 AM, Chris Idou wrote:
> Bill.... I don't know if this was discussed before, but could you discuss the
> lack of GC on the iPhone?
I suspect it is for performance reasons. The Objective-C garbage collector is
designed to run in a separate thread on the Mac, which means it can run on its
own CPU core separate to the main thread.
In single-core systems, even on the Mac, performance of Garbage Collected code
is very poor because the collector has to share CPU time with the main thread.
When Xcode 3 (a GC app) was first released in the Leopard betas there were
still quite a few people with single-CPU PowerPC laptops who found that Xcode
could barely keep up with their typing. On dual-core machines it was fine.
The iPhone has a single-core CPU and a slow one at that, so while I am sure
that GC could be turned on, it would probably make developers very unhappy.
--
Rob Keniger
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