Question about the swap file...???
wpdster at gmail.com
Tue Jun 22 12:55:12 UTC 2010
On Tue, Jun 22, 2010 at 8:46 AM, Larry <larryesu at charter.net> wrote:
> *I've been watching my pc's CPU at times in is lower than at other time,
> I am guessing when it is performing a task, it inscreases say from 16.5
> too 48, then drops back to a lower rate...But the Swap file shows 0%,
> all of the time, would this speed up things if the swap file would take
> the load away from the CPU at times...???
> If this is true, can someone suggest to me on how to get the swap to be
> used when it is needed...???
> Thanks for any help on this issue...
The swap file is space on your hard disk that is effectively "extra
memory" outside of the 2G, 4G, or whatever amount of RAM you have on
your motherboard. Accessing a hard disk is orders of magnitude slower
than accessing RAM. So the kernel tries very hard never to put things
into the swap file -- because it just slows everything down -- having
to write to the hard disk, having to read it back later when the data
are needed again, keeping track of what is stored where, etc... This
is a very simplified explanation, but I hope it gives you the idea.
You asked "how to get the swap to be used when it is needed?" The
answer is -- the kernel will use it when it is needed. But if you
have enough RAM in your system, hopefully it will never be needed.
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