Mailinglist Archive: opensuse (671 mails)

[Per Jessen <per@xxxxxxxxxxxx>]

Anders Johansson wrote:

> On Monday 13 June 2011 14:43:08 David Haller wrote:
> > Hello,
> >
> > On Mon, 13 Jun 2011, Per Jessen wrote:
> > > jsa wrote:
> > > > On 06/12/2011 07:46 AM, Anton Aylward wrote:
> > > > > The 'swapon' command will tell me how much swap is being used.
> > > > >
> > > > > Is there anything that will tell me what is using swap, what
> > > > > programs, processes etc are using it or what the contents of swap
> > > > > is?
> > > >
> > > > Forgot to add, you can run top in a terminal and then press f
> > > > followed by p to add a column for swap usage.
> > >
> > > Or just swap = virtual - resident.
> >
> > So:
> >
> > ps -eo vsz,rss,cmd | awk '{ printf("%10s  %s\n", $1 - $2, $3); }'
>
> Nah, that won't work. The virtual size of a process includes
> everything, even things that haven't been loaded yet, parts of mmap:ed
> files that have never touched memory, allocated memory that hasn't
> been used, shared memory that has been mapped into the process address
> space, shared libraries etc. That calculation will very likely tell
> you that you are using a million times more swap than you actually
> have

If you take a quick(!) look at top with the swap column added, my
calculation of swap = virtual - resident is pretty close on a regular
system.  I'm sure there are plenty of exceptions, but if one is
concerned about memory usage and swap usage, top does provide a good
starting point.


-- 
Per Jessen, Zürich (20.6°C)

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