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10.5: List 64-bit enabled GUI applications in 10.5
Authored by: Michelasso on Mar 11, '08 04:59:19AM

Is at least the kernel coded at 64 bits? Not that it matters too much to most users. The only app I have that makes an heavy use of the CPU is VisualHub.



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10.5: List 64-bit enabled GUI applications in 10.5
Authored by: abyone on Mar 11, '08 10:34:47AM

No, the kernel is 32bit



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10.5: List 64-bit enabled GUI applications in 10.5
Authored by: mzs on Mar 11, '08 12:55:53PM
Yes 32-bit kernel:

$ file /mach_kernel*
/mach_kernel:        Mach-O universal binary with 2 architectures
/mach_kernel (for architecture i386):	Mach-O executable i386
/mach_kernel (for architecture ppc):	Mach-O executable ppc
/mach_kernel.ctfsys: Mach-O universal binary with 2 architectures
/mach_kernel.ctfsys (for architecture i386):	Mach-O executable i386
/mach_kernel.ctfsys (for architecture ppc):	Mach-O executable ppc
Anyone know what the difference between /mach_kernel.ctfsys and /mach_kernel is?

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10.5: List 64-bit enabled GUI applications in 10.5
Authored by: ajmas on Mar 12, '08 02:16:13PM
No, the kernel is 32bit

What computer did you do this check with?

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Kernel in Leopard is 32 bit only
Authored by: hamarkus on Mar 12, '08 02:36:55PM
At the last Chaos Computer Club conference in Hamburg, Germany, probably the biggest indie programmers conference in Germany, a talk about the structure of Leopard discussed this issue. It was made clear that the kernel is still 32 bit, but it was concluded that as long the kernel does not need more than 4 GB (2 GB?) of memory itself this does not really matter, and the kernel itself is certainly for from needing this much of memory (except that caching might make use of more memory).
http://chaosradio.ccc.de/24c3_m4v_2303.html

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