[kde-solaris] Memory usage

Lars Tunkrans lars.tunkrans at bredband.net
Sat Aug 7 00:17:16 CEST 2004

M Hawkins wrote:
> Hi,
> 	I have compiled Stefan's version of KDE 3.2.2 using his runconfig
> and workshop settings files. But I am worried by the memory usage and was
> wondering if people where seeing the same.  For 3.2.2 swap -s shows
> total: 77592k bytes allocated + 251128k reserved = 328720k used, 100392k
> available

That is not memory used. It is Swap area Reserved. Its reserved
for the potential need of having to page out most of the process.
The solution to that is to have a large swaparea.  2 GB is the recommended value AFAIR.
A small swap area always puts you in the riskzone for this problem:

     If you cant reserve swap space you cant load more processes.

If you program DO NOT preallocate page-out space you run the risk of
not being able to page an existing process when you try to load a new one
if the Virtual memory is already full at that point.
I would argue that Pre allocation of page-space is a more defensive method
that protects whats already running .

Use the utility pmap(1)  to findout how much private and shared ram each
KDE process Uses. ( pmap -x pid )
Or install RMC's unsupported memtool.


> this is for a basic default kde session, with only one konsole running and
> no mail
> compare this to kde 3.1.1 built with gcc
> total: 112648k bytes allocated + 65584K reserved = 178232k used, 510872k
> available
>                                  ^^^^^^
> this is for a big session with mozilla, mail and editors running.  The
> machines are pretty much identical with 256MB of memory except the second
> one has 512MB of swap configured.
> Am I the only one seeing this massive increase ?  I have to find a way
> around this because at the moment I can only run about 5 konsoles and mail
> before things start falling apart.
> Thanks
> Mike
> --
> Mike Hawkins                 "Eagles may soar high, but weasels don't 
> mh at awe.co.uk                  get sucked into jet engines" 
>                                             - David Brent, The Office
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