![]() Starting with Mountain Lion, OS X exclusively uses a 64-bit kernel, but it continues to run both 32-bit and 64-bit applications. OS X was the first operating system to ship as a single install that could boot into either a 32-bit or 64-bit kernel, either of which could run 32-bit and 64-bit applications at full native performance. To run Windows programs without having to install Windows. This method will allow you to run Mac and Windows applications concurrently, though the virtual machine does not support as much Windows functionality as a dual-boot configuration. Quoting from its page 5 (emphasis added): To run Windows in a virtual machine within macOS, use Parallels Desktop, VMware Fusion, or VirtualBox. If you have any doubts about this, please refer the Apple OS X Mountain Lion Core Technologies Overviewpdf document. It can't, because (as has been mentioned by several of us) there is no 32 bit kernel code in Mountain Lion. The getkernelbootarchitecturesetting option of the systemsetup command will read that file & tell you if its Kernel Architecture setting is 32 bit, 64 bit, or the default.īut that doesn't mean that at boot time the Mac will actually start up in 32 bit mode. And it showed that the Mac is running in 32 bit mode.Īt best, that command will change a flag in the /Library/Preferences/SystemConfiguration/ file. There currently are specialized processors in development and research that are 128- and 256-bit, but so far these needs have not been required in the central processing units of mainstream computers. In comparison to 16-bit to 32-bit gives a ~65,000 greater resource capability, and the jump from 32-bit to 64-bit gives just over 4-billion times greater resource capability than 32-bit.įor now this should hold us over, but as programming gets even greater, and as RAM needs get larger and larger, some day the bitness of processors may have to increase again to accommodate our needs. While it may not seem like much, these transitions are exponential in nature, so the jump from 8-bit (2^8) to 16-bit (2^16) gives a 256-fold greater resource capability. However, in the mid-2000s programming began using enough resources to require even more than what 32-bit processing was capable of, hence the jump to 64-bit. ![]() The move to 32-bit greatly increased the capabilities of systems and allowed for far greater media handling and multitasking among other features. Computers started with much smaller number processing capability (4-bit, 8-bit, 12-bit, etc.), and then for a while sat at 16-bit capability however, this only allowed for a finite set of resource management, namely RAM capabilities. It's more or less a natural progression of technology advancement. ![]() Why all of a sudden all software is running in 64 mode?
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