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Surprisingly, the first solution to this flaw was published by software utility company Connectix, whose 1991 product MODE32 reinitialized the Memory Manager and repeated early parts of the Mac boot process, allowing the system to boot into 32-bit mode and enabling the use of all the RAM in the machine. Older ROMs did not have any 32-bit Memory Manager support and so was not possible to boot into 32-bit mode.
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#Memory clean mac mavericks drivers
The problem was that the decision to use 24-bit or 32-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. With System 7, the Mac system software was finally made 32-bit clean, but there were still the problem of dirty ROMs. In order to stop continual system crashes caused by this issue, System 6 and earlier running on a 68020 or a 68030 would force the machine into 24-bit mode, and would only recognize and address the first 8 megabytes of RAM, an obvious flaw in machines whose hardware was wired to accept up to 128 MB RAM – and whose product literature advertised this capability.
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Another application might be memory starved, but would be unable to utilize the free memory 'owned' by another application. Apart from exposing users to esoteric technicalities, it was inefficient, since an application would be made to grab all of its allotted RAM, even if it left most of it subsequently unused. While popular among 'power users', this exposure of a technical implementation detail was against the grain of the Mac user philosophy. Sometimes this value wasn't enough for particular kinds of work, so the value setting had to be exposed to the user to allow them to tweak the heap size to suit their own requirements. The amount of actual RAM allocated to each heap was set by a value coded into the metadata of each application, set by the programmer. Because Apple was now committed to its memory management model, as well as compatibility with existing applications, it was forced to adopt a scheme where each application was allocated its own heap from the available RAM. This was a necessary step forward for users, who found the one-app-at-a-time approach very limiting. The situation worsened with the advent of Switcher, which was a way for a Mac with 512KB or more of memory to run multiple applications at once. Since the entire application heap was dissolved when the application quit, fragmentation was minimized. As long as only one application at a time was run, the system worked well. The machine itself implemented two areas in memory available for this scheme - the system heap (used for the OS), and the application heap. If a memory request required compaction of memory, this was done and the table, called the master pointer block, was updated. Apple's scheme was simple - a handle was simply a pointer into a (non relocatable) table of further pointers, which in turn pointed to the data. To solve this, Apple engineers used the concept of a relocatable handle, a reference to memory which allowed the actual data referred to be moved without invalidating the handle. That has the same system setup as mine experiencing the same problem.The primary concern of the original engineers appears to have been fragmentation - that is, the repeated allocation and deallocation of memory through pointers leading to many small isolated areas of memory which cannot be used because they are too small, even though the total free memory may be sufficient to satisfy a particular request for memory. So i believe the problem is not about my computer's CPU and RAM etc. I notice no performance speed changes, comparing to only use 1 tab of safari and no other apps. (pages, numbers, keynote, word, excel, powerpoint, etc.)
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Opened up 20 tabs in Safari, 10 tabs in Chrome, 10 tabs in Firefox. but VM had make my Activities Manager a red wall of text! > nothing happened!Īfter 6 mins 36 secs, mail app opened up. When i switched back to mac os, anything i clicked won't response.ĥ. its very fast to get VM started and login, after clicked 'desktop' in the welcome screen. exit all active apps on OS X, only Activities Manger is open.ģ. Is it parallels, OS X Mavericks, or there are conflicts between the two.ġ. I wonder whether other people that has the same system setup as mine experiencing the same problem.