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Apple Computing Products:
macOS - Operating System
Question about 64bit vs 32bit with 10.6
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<blockquote data-quote="vansmith" data-source="post: 901020" data-attributes="member: 71075"><p>On Macs, you can't boot into a 64-bit kernel with a 32-bit EFI (right now) so the question doesn't really make sense. To quote <a href="http://www.osnews.com/story/22009/Snow_Leopard_Seeds_Use_32bit_Kernel_Drivers_by_Default" target="_blank">this</a> article, "Only Macintosh machines with a 64bit EFI are able to boot the 64bit Snow Leopard kernel and kexts; this is an artificially implemented limitation by Apple, as 32bit EFI can boot a 64bit kernel just fine." As you can see, you can't boot a 64-bit kernel with a 32-bit EFI right now on Macs. If you could, you would get the benefits of having a 64-bit kernel just like everyone else.</p><p></p><p>On top of this, quite a bit of the refinements are independent of the 64-bit improvements including <a href="http://www.apple.com/macosx/technology/#grandcentral" target="_blank">Grand Central Dispatch</a> and <a href="http://www.apple.com/macosx/technology/#opencl" target="_blank">OpenCL</a>. There is much more to the optimization of OS X than just increased 64-bit pervasiveness.</p></blockquote><p></p>
[QUOTE="vansmith, post: 901020, member: 71075"] On Macs, you can't boot into a 64-bit kernel with a 32-bit EFI (right now) so the question doesn't really make sense. To quote [URL="http://www.osnews.com/story/22009/Snow_Leopard_Seeds_Use_32bit_Kernel_Drivers_by_Default"]this[/URL] article, "Only Macintosh machines with a 64bit EFI are able to boot the 64bit Snow Leopard kernel and kexts; this is an artificially implemented limitation by Apple, as 32bit EFI can boot a 64bit kernel just fine." As you can see, you can't boot a 64-bit kernel with a 32-bit EFI right now on Macs. If you could, you would get the benefits of having a 64-bit kernel just like everyone else. On top of this, quite a bit of the refinements are independent of the 64-bit improvements including [URL="http://www.apple.com/macosx/technology/#grandcentral"]Grand Central Dispatch[/URL] and [URL="http://www.apple.com/macosx/technology/#opencl"]OpenCL[/URL]. There is much more to the optimization of OS X than just increased 64-bit pervasiveness. [/QUOTE]
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Apple Computing Products:
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Question about 64bit vs 32bit with 10.6
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