Mac 64 bit kernel boot
If a user-space driver crashes, it will not crash the kernel. However, if a kernel-space driver crashes it will crash the kernel. To run safely on multiprocessor machines, access to shared resources files, data structures etc. Atomic operations , spinlocks , critical sections , mutual exclusions "mutexes" , and serializing tokens are all possible methods that can be used to prevent concurrent access.
- Checking 32 or bit Kernel Boot Mode in Snow Leopard – The Mac Observer.
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Finally, this is worth repeating: please keep in mind that you do not need to run the bit kernel in order to run bit applications or install more than 4GB of RAM in your Mac. Applications run just fine in bit mode on top of the bit kernel, and even in earlier versions of Mac OS X it's been possible to install and take advantage of much more than 4GB of RAM. Mobile operating systems.
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There are a number of performances gains to be had from doing so, but if it comes with compatibility headaches, Apple may be better off letting those will older machines decide for themselves to force bit mode if they desire. Less savvy users will be none the wiser, as it will boot in bit mode and run bit applications without issue. A product manager at Apple Australia explained that by and large, everything that users experience on a Mac will feel like bit.
Applications should load faster and run in a more stable fashion. In short, very few things require bit mode at the kernel level, and we're guessing that it defaults to bit due to the fact that a select few of the earliest Macs didn't ship with bit CPUs.
If you'll think way back to when Apple made the shift to Intel, some of those machines shipped with Intel's bit Core Duo and Core Solo processors. But still, Apple had to account for those early Intel Mac's, MacBooks, MacBook Pros and Mac minis with Snow Leopard; it couldn't just leave those folks hung out to dry, so it simply decided to go bit at the kernel level for all Macs rather than making a fuss about it and potentially confusing the general public.
If you are one who can run with bit, then let's first find out if it is running in bit now or not.
First go to the A pple logo and select About This Mac. You now want to click on the More Info The window below will pop-up, and where it says bit Kernel and Extensions : it should read yes. If you have never booted your machine into bit, then it probably reads No. Now comes the hard part.
How to Tell if Mac is Running a 32-bit or 64-bit Kernel in Mac OS X
To boot your Snow Leopard into bit mode, then you need to first shut down all of your applications. Once everything is closed down then you need to go to the Apple logo and click Restart. As the computer is booting-up hold down the 6 and 4 keys simultaneously. That's all there is to it.
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If you want to go to bit mode then guess what? Hold down the 3 and 2 keys simultaneously during boot-up. Oddly enough, it takes the computer longer to boot-up in bit mode than But, once you are in Safari 4 is a bit application and just smokes with Snow Leopard. Did you know that there's a quasi-hidden feature in Snow Leopard that will make your Macintosh run faster across the board at the expense of some backward compatibility?
SixtyFourSwitcher is a preference pane that makes it easy for users to switch between booting using the bit version of the Mac OS X kernel and the corresponding bit version. Why would anyone want to do this?