[GLLUG] Swapin in iotop

[Tom Taylor]

I've been watching vmstat and using free -k and I've not seen anything
touch it during my samples.  There is 84kB in swap but that has been there
ages.

Ignoring the file cache, there is about 8GB free on this box (16GB total)
so I wouldn't expect swap to be doing anything.  Swap is only 512MB (left
over as part of the build process).

I'm wondering if swapin is a measure related to page allocation that has
nothing specifically to do with the disk based swap but with virtual memory
as a whole.


On 8 March 2013 15:19, Hearns, John <john.hearns at mclaren.com> wrote:

>
> On Fri, Mar 08, 2013 at 02:48:25PM +0000, Tom Taylor wrote:
> > Does anyone know what this metric actually refers to?
> >
> > I can see processes showing with a % of SWAPIN on a box that isn't
> swapping
> > anything to disk.
> >
> > e.g. http://pastebin.com/gwGU7kCX
>
> I am a bit of an iotop fan too.
> How do you know the system is not swapping - are you running it without
> swap?
> ($cat -> $pigeons   I quite happily run systems without swap)
>
> Another very useful tool is
>
> Watch  cat /proc/meminfo
>
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