What is virtual memory mac
Virtual memory adds more memory to your Macintosh by making use of unused free space on the hard drive. Because the extra memory comes from the hard drive, though, it is much slower than the RAM chips. Apple officially supports virtual memory beginning with System 7 , but Connectix Corporation works well under System 6 , thanks to its Virtual software.
Only Macintosh computers with a Motorola processor can use Virtual Memory. A large chunk of hard drive space is set aside just for the use of virtual memory. With System 7, the Mac system software was finally made bit clean, but there were still the problem of dirty ROMs. The problem was that the decision to use bit or bit addressing has to be made very early in the boot process, when the ROM routines initialized the Memory Manager to set up a basic Mac environment where NuBus ROMs and disk drivers are loaded and executed.
Older ROMs did not have any bit Memory Manager support and so was not possible to boot into bit mode. Surprisingly, the first solution to this flaw was published by software utility company Connectix , whose product MODE32 reinitialized the Memory Manager and repeated early parts of the Mac boot process, allowing the system to boot into bit mode and enabling the use of all the RAM in the machine.
Apple licensed the software from Connectix later in and distributed it for free.
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It was quite a while before applications were updated to remove all bit dependencies, and System 7 provided a way to switch back to bit mode if application incompatibilities were found. At first, it would seem natural that objects would be implemented via handles, to gain the advantage of being relocatable. These languages, as they were originally designed, used pointers for objects, which would lead to fragmentation issues.
A solution, implemented by the THINK later Symantec compilers , was to use Handles internally for objects, but use a pointer syntax to access them.
Mac OS memory management
This seemed a good idea at first, but soon deep problems emerged, since programmers could not tell whether they were dealing with a relocatable or fixed block, and so had no way to know whether to take on the task of locking objects or not. Needless to say this led to huge numbers of bugs and problems with these early object implementations.
Later compilers did not attempt to do this, but used real pointers, often implementing their own memory allocation schemes to work around the Mac OS memory model. While the Mac OS memory model, with all its inherent problems, remained this way right through to Mac OS 9 , due to severe application compatibility constraints, the increasing availability of cheap RAM meant that by and large most users could upgrade their way out of a corner. The memory wasn't used efficiently, but it was abundant enough that the issue never became critical.
This is ironic given that the purpose of the original design was to maximise the use of very limited amounts of memory. Mac OS X finally did away with the whole scheme, implementing a modern sparse virtual memory scheme. A subset of the older memory model APIs still exist for compatibility as part of Carbon , but map to the modern memory manager a threadsafe malloc implementation underneath.
3 Ways to Adjust Virtual Memory - wikiHow
From Wikipedia, the free encyclopedia. Retrieved Classic Mac OS.
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- Tip # 1. Remove Login Items to lower Mac memory usage.
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If it takes abnormally more than that, go inside that particular item in the list and press Quit button. Login items are programs that load automatically upon Mac startup. Some of them covertly add themselves to the list and this is no good. The easiest way to do it without racking your brain with system settings is via CleanMyMac X app:. The GPU Process, though helpful in theory to accelerate pages, eats up a considerable amount of memory. Click to end it to reduce memory usage on Mac. This tip always comes at the bottom of instructions and unfairly so as it is quite effective. Thing is, your macOS was designed in a way that it treats every Desktop icon as a little active window.
The more icons, the heavier memory usage on Mac.
As of , Dashboard functionality looks somewhat obsolete as there are standalone apps for most of the tasks the Dashboard offers. A quick way to do it is via System Preferences app. In the dropdown menu next to Dashboard choose Off. This completely switches off the Dashboard.
Bye-bye Dashboard, you were great once ago. Use the dropdown menu to set any other location except All My Files. For example, you can set it to Downloads or whatever folder you like. Now close Finder. The last step is to relaunch Finder: double-click it while holding Option button and choose Relaunch. So now your computer relies on your hard drive space to keep your apps going.