There's no harm in it, and sometimes someone will be able to pick up a book immediately that he would otherwise have had to wait for.
The space is there in the stacks there's no use leaving it empty, so you might as well keep the books you already have there. To extend the library metaphor, imagine that the library keeps books that have been recently used in the stacks.
MEMORY CLEANER MAC OS X FREE
Inactive memory is basically memory that Mac OS is keeping something in on the off chance it's needed again if your system needs that memory for something else, it'll be converted to free memory without any performance hit. You shouldn't worry about it.Īnd don't worry if you have lots of "inactive" memory and little "free" memory, either. If you stored these things in the warehouse, you could never retrieve books to bring them back to the library-so they must be kept in the library at all times, lest the whole system break down.Īnyway, getting back to practical considerations: wired memory is basically used by your computer for internal bookkeeping of various sorts. The information in wired memory, then, would be things like the card catalog, keys to the book delivery trucks, and maps of the route to the warehouse. If not, ask a librarian and the book you want will be transported from the warehouse and given to you the next day. If you show up at the library looking for a book, and it's in the stacks there, you can read it immediately.
MEMORY CLEANER MAC OS X PLUS
(The real Bodleian Library has about forty sub-libraries of various descriptions, plus storage for really rare books, but this is a thought experiment.) Most of the books are kept in the warehouse, but anything that's been used recently is kept in the library. So instead, imagine that the librarians construct a vast warehouse. There's no way you could possibly fit all that stuff into a single building-certainly not one in the middle of a university campus. Think of, for example, the Bodleian Library at the University of Oxford, which has eleven million printed items. To understand why, imagine an enormous library. In any case, much of this information is needed to manage and access memory, and so it can't itself be swapped out to disk! I suspect that the memory used by the integrated video chips in most Macs is wired as well, but I can't find anything that says that outright. The "page tables" that form a map of your system's memory are also stored in wired memory, and a system with more memory needs larger page tables. Wired memory is used for some of the core functions of the operating system-things like keeping track of all the applications on your system, or open files and network connections, or chunks of memory used by various drivers.
It's many layers removed from the icons in the menubar, which are just ordinary apps showing themselves in an odd way. From what I can tell, wired memory belongs to the kernel, the innermost core of Mac OS X.
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