While this is beneficial to the system, it is a little deceptive when trying to determine the amount of free RAM on the system. Instead of having to load the RAM contents from the hard disk, the system will just convert the inactive RAM back to being active. The use of inactive RAM allows the system to more quickly relaunch those recently used processes, and therefore increase the speed of the system. This RAM is essentially free RAM, with the exception that OS X has kept track of what has recently been loaded into it.Įven though Activity Monitor shows a sliver of "free" memory available, this does not reflect the total amount of available RAM for use with new processes and applications. It may have been used by a recently quit process, or by an active one that no longer needs it, and is not required for use. This is the amount that has recently been used but is no longer required. This is the current amount of memory besides wired RAM that is being used by system and user processes. This RAM cannot be written to virtual memory on the hard disk. This is the amount that must be kept active for the system to run. There are four ways that RAM is described by the system: free, wired, active, and inactive.īeing rather self-explanatory, this is the amount that has not been recently used by an application or system process. The question is whether or not this will affect performance, and what can be done about it? When looking at the System Memory pie chart in Activity Monitor, it's apparent that the "Inactive" memory segment seems to be growing. A few users have noticed that over time the amount of free RAM on their systems seems to go down, even if the active RAM size has not changed much.
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