4/6/2023 0 Comments Memory clean 2 vs 3Inactive 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. (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. You can plug USB 2.0 devices into USB 3.0 ports, too.From what I can tell, wired memory belongs to the kernel, the innermost core of Mac OS X. There’s no harm in having such devices be USB 3.0 - especially given the backwards compatibility - but there’s no sense in paying extra for that. Of course, eventually USB 3.0 will take over and all devices will use USB 3.0 or newer. If you use a USB mouse and keyboard, you won’t see any sort of input speed improvement by moving to USB 3.0. Don’t just believe the manufacturer’s quoted speed rate, as manufacturers often give you the most exaggerated numbers to mislead you - look up independent benchmarks on your own.īear in mind that many types of devices won’t perform faster just because they use USB 3.0. If you’re looking for a good, fast USB drive for serious use - and not the cheapest $5 drive - you should look up benchmarks ahead of time and determine just how fast your drive of choice is. RELATED: 8 Ways Hardware Manufacturers Are Deceiving You Other factors, such as the speed of the flash memory inside the drive, are critical. USB 3.0 allows for much faster transfer speeds, but not every drive will take advantage of that.
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