Why would my server be swapping...
Tommy Reynolds
Tommy.Reynolds at MegaCoder.com
Thu Oct 14 14:45:37 UTC 2004
Uttered Wouter van Vliet <wouter.van.vliet at gmail.com>, spake thus:
>Crappy intro, huh? Anyway, I've got a question - bit of an oddity I
>noticed in the output to the "free" command. I'll post that output
>before I continue:
>
> total used free shared buffers cached
>Mem: 515536 196040 319496 0 22448 120144
>-/+ buffers/cache: 53448 462088
>Swap: 1052248 151476 900772
>
>Hope the mail brings it over nice and columny. Anyway, what it shows
>is 311 megabytes of free memory and 147MB used swap space. Isn't that
>a bit odd, and shouldn't the server only be swapping when all (or at
>least most) of the RAM is in use?
Nope, not odd at all. The kernel does "anticipatory swapping" by
moving VM pages out that haven't been used in a while: this is called
"buffer aging". This is a "good thing" because it helps the kernel
have more free memory ready for a burst of activity in the future.
No worries, mate.
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