Kubuntu uses too much memory. What is the cause?
derek at pointerstop.ca
Thu May 28 18:42:08 BST 2009
> My computer has 2GB ram. After running Jaunty for a while (an hour and
> up), the swap starts to fill and things start to get slow.
> $ free -m
> total used free
> Mem: 1978 1944 33
> -/+ buffers/cache: 621 1356
> Swap: 1906 759 1146
> Programs I'm running:
> - Kontact
> - Amarok
> - Dropbox
> - Konsole
> Other that that, there's not much activity.
> Now, I don't see this behaviour on other Kubuntu boxes. Is there a way to
> see what process is filling the swap?
The swap is hardly "full" - it's well under 50% utilized. It's in the
nature of swap space that it tends to collect cruft. Things stay in swap
until they're no longer needed AND something else needs the space. Unless
you can show situations where you have a lot less free swap than this, I'd
have to say it isn't your problem (my last machine slowed down as memory
filled, too, and I thought it was actually lack of memory, when the problem
turned out to be a failing drive, making it very hard for the system to swap
anything - I only clued in when the drive failed completely).
fwiw, some of the filling of virtual memory over time comes from files built
in tmpfs filesystems. Normally, iirc, /var/run, /var/lock, and a couple of
others. Apparently I can't check right now, as I just rebooted into a
Karmic kernel and "mount" refuses to show me most of my mounts. Something
to do with "fuse", it seems.
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