[FreeNX-kNX] Memory leak in nxagent, with patch

[Dimitar Paskov]

I tried the backing store option on my client side X server but with no effect 
at all ... the simple test I run shows that the memory fills again ... I open 
a pdf viewer (kpdf) and began to scroll a long pdf document ... with every 
page displayed on the screen the memory of the thin client (Xorg binary) 
becomes bigger ... when I scroll back, the pages are open very fast which 
means that they are cached in memory ... when I close the pdf viewer the 
memory is released back to initial state ... the question is why X server 
keeps this pixmaps (from the pdf document) in its memory ... I tried this on 
a normal debian based workstation with local X (no freenx and nomachine) and 
the memory did not moved a bit! I guess that this memory management has 
nothing to do with the backing store option ... and I wonder why the X org 
binary uses so much memory instead of the nxclient/nxssh which seem more 
logical ... 

> > I forgot to mention, I use nxclient 1.5.0-141, nxagent Version 1.5.0 and
> > freenx 0.5 ... I haven't tried with different versions of the client and
> > the
> > server and I didn't try the patch yet ...
>
> Okay. I dunno if its already present in 15..0, but it might be as at that
> time the lazy image encoding was started.
>
> > What is the meaning of
> > this "backing store" option, what does it change and how it affects the
> > problem with memory leak?
>
> Okay, let me explain that.
>
> An Xserver has a backingstore to cache images in itself. (as far as I
> remember)
>
> Disabling the backingstore might hurt performance a bit, but as the proxies
> already do memory limited caching of compressed images that backingstore
> should not be needed ...
>
> Just try it the option flag to the original X server is -bs.
>
> cu
>
> Fabian
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