About Swap space and Virtual Memory

Danny Engelbarts d.engelbarts at gmail.com
Wed Mar 31 06:16:14 PDT 2010


On Wednesday 31 March 2010 12:03:05 zzflop wrote:
> On Wed, Mar 31, 2010 at 04:56:04PM +0800, liu bo wrote:
> > Hi all,
> > 
> > Could anybody tell me whether the SWAP space of my computer is used?
> > 
> > According to the information below,
> > 
> >             Swap:   307192k total,        0k used
> >             
> >             VIRT SWAP RES  SHR S %CPU %MEM    TIME+  COMMAND
> >             693m 657m  35m 8780 S    0      2.0            0:51.46  X
> > 
> > I don't know how to explain the two conflicted data above.
> 
> My default top command doesn't show the SWAP field, but I
> read the man page to see how to toggle it and I also have
> entries in the SWAP field with the upper "0k used". I don't
> know the reason for it, but am curious about the diff too.

I believe the SWAP column only displays the swappable memory chunk, not actual 
swapped memory. If you disable swap using "swapoff -a" you will see the SWAP 
column in top still contains the same values.

Regards, Danny.

> 
> I rarely show anything in the upper entry except when
> playing video files.
> 
> Mike H.
> _-_-_-_

-- 
In theorie is er geen verschil tussen theorie en praktijk.



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