My MacOS X

Run the following command in Terminal to see exactly how many of OS X’s extensions are 64-bit and how many are still 32-bit and shows ppc kexts as well. file /System/Library/Extensions/*.kext/Contents/MacOS/* | perl -nle 'print $1 if /\((.*)\)/' | sort | uniq -c Above  command will take a few seconds to run. Comparison between 10.5.8 and 10.6.0. 10.5.8 109 for architecture i386 106 for architecture ppc 3 for architecture ppc7400 10.6.0 135 for architecture i386 38 for architecture ppc 127 for architecture x86_64 You can also look at “Extensions” in the “Software” ...(continue read)
tags: 10.6, 64-bit, kernel

Users who want to run the new 64-bit kernel on late-model Macs (pretty much anything released after early 2008) can do so by booting with the 6 and 4 keys held down. If you’re wondering whether your Mac has a 64-bit EFI firmware, you can type this command in Terminal: # ioreg -l -p IODeviceTree | grep firmware-abi The response will identify the machine as either having 32-bit or 64-bit EFI. To boot 64-bit kernel every time you boot machine: 1. Print nvram settings # sudo nvram -p 2. Set boot-args to use 64 bit kernel # sudo nvram boot-args="arch=x86_64" Don’t forget to add ...(continue read)
tags: 10.6, kernel, Snow Leopard