I’ve taken the plunge and installed Snow Leopard (aka Mac OS X 10.6) and was pretty psyched about the fact that it’s a 64-bit operating system, until my brother said “yeah, but I bet you’re still running in 32-bit mode”. How can I tell if my Snow Leopard computer is now running in 32-bit “compatibility” mode or as a true 64-bit operating system? Before we go further, realize that the majority — if not the vast majority — of people running Mac OS X 10.6 Snow Leopard are running in 32-bit mode. In a lot of ways, I think that the 64-bit capability of the operating system is there for future growth of the platform, not because your iMac or PowerBook can handle it (or needs it, for that matter).

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For an operating system that Apple has said is all about fixes and tweaks, there’s actually rather a lot of new stuff that shows up, and a lot of code has been rewritten and enhanced without much fanfare. One example that’ll be critical for our needs is the Activity Monitor, which you can find in “Applications” –> “Utilities”. Launch it and you’ll see something like this: Notice the “Kind” column. As you can see, some programs run in 64-bit mode, while others run in 32-bit mode, approximately 50/50 on my computer.

Third party apps, like Adobe Air (which runs Seesmic Desktop) and Microsoft Entourage run as 32-bit applications, no surprise there. But if you look closely, you’ll see that iTunes is also still a 32-bit application. Hmmm I expect that to change fairly soon!

This doesn’t show you whether you’re running in 32-bit or 64-bit mode, though, so to ascertain that you have to go through a slightly different hop click on the “Apple” menu and choose “About This Mac” then click on the “More Info” button. This will launch “System Profiler” and if you look down the left side you’ll see the major categories of “Hardware”, “Network” and “Software”. Click on “Software” and if you’re running in 32-bit mode, you’ll see this: See that line “64 bit Kernel and Extensions”? The value “no” means that you’re not running in 64-bit mode. Now, try rebooting and forcing 64-bit mode by holding down the “6” and the “4” key during boot. There’s not much you’ll see different when you’re running this way, but if you navigate to the same area in “System Profiler”, you’ll now see this: You can also tell if individual apps are 64-bit capable by using the good ole’ “Get Info” command. A 32-bit program that can’t run in 64-bit mode will look like this: By contrast, a 64-bit friendly app shows this: The key is near the bottom: “Open in 32-bit Mode”.

One final thing to show you: If you do boot into 64-bit mode, go back into Activity Monitor and you’ll see a funny thing: That’s right, even in 64-bit mode, you’ll find that much of your system is running in 32-bit mode anyway. Ah well, now you know. Should you care? Probably not. Apple has done a splendid job of hiding this level of complexity from the user, so if your system works then you’re good! Oh, and don’t forget, I have lots of here on the site too.

Mac OS X 10.6 Snow Leopard (SL) introduces 32 bit and 64 bit kernel, processes, and applications to the end user. But what does it mean and does it affect you? Here are answers to some frequently asked questions. Note that OS X 10.4 and 10.5 also have 64-bit support for part of the system. (Did you know PowerMac G5 introduced in 2003, with 32bit Mac OS, can access more than 4GB of RAM? Mac OS isn't limited as much with 32bit 64bit issues as windows.) ----------------------- Common Questions ----------------------- 1. I don't understand 64 bit.

Why isn't my Mac booting a 64 bit kernel. How do I boot a 64 bit kernel under Snow Leopard. Why aren't all my applications 64 bit.

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How come my Mac crashes when running the 64 bit kernel. ----------------------- Answers ----------------------- 1.

I don't understand 64 bit. You don't HAVE to know about 64 bit. For most users of OS X, it won't matter. The Application delivery mechanism for future OSX Snow Leopard apps will still be Universal Binary, which will include BOTH 32bit and 64bit code if available. The default SL kernel is 32 bit which is more compatible.

Note that the Snow Leopard 32 bit kernel can still run 64 bit processes that allows access to more memory, useful for some power users. The only reason you have to know about 32bit or 64bit is if you are running windows. With Windows there is a 4GB total memory limit with 32 bit windows. Mac OS is different. Even Macs running Leopard can contain and use far more RAM than the 4 GB limit the '32-bit' qualifier might seem to imply. Yes, 64-bit kernel (K64) allows use of a very large number of RAM, 16 exabytes to be exactly, but do you have any apps that need more than a few GB of RAM?