Cache Memory in top command
b.smeelen at ose.nl
Thu Sep 30 07:25:00 UTC 2010
On 09/29/2010 07:36 PM, RW wrote:
>>> Bas Smeelen <b.smeelen at ose.nl> wrote:
>>>> *Cache:* number of clean pages caching data that are available for
>>>> immediate reallocation
> I don't see why it would be included in wired, and I'm pretty sure
> that's wrong.
>From the man page:
*Wired:* number of pages wired down, including cached file data pages
> The cache queue is a stock of clean pages, it's sort of an intermediate
> state between inactive and free. Most memory allocations can be
> performed directly from the cache queue, which allows memory to hold
> useful data right up to the moment it's reallocated, and it allows
> FreeBSD to run with very little free (i.e. wasted) memory.
> Cache memory is topped-up with memory from the inactive queue in the
> background. Likewise inactive memory is topped-up from active memory.
> Since that's done on demand the values are virtually meaningless.
Thanks for your detailed explanation
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