KDE not usable in LTSP fat mode, too I/O traffic

[Aaron J. Seigo]

On Sunday, September 30, 2012 17:00:41 marco Mailing List @ ammdomus wrote:
> The problem I'm facing is also present in normal stand alone PC, but
> there has less impact since there is fewer I/O (something to
> investigate) and, more important, the I/O is faster.

why there is less I/O in a stand-alone would be nice to know. this includes 
which components are causing the writing.

one thing that jumps to mind is, as you noted, is the cache files. i wonder if 
those are either being re-written, or if they are being unecessary transfered 
due to internals in KSharedDataCache (KSDC), etc. if there is some interaction 
between KSDC and the mechanisms used to run the fat clients, it could be that 
the contents of the caches are being transfered unecessarily for each and 
every process that accesses them. that's a shot in the dark, though, and i'd 
be a bit surprised if that was the cause.

really i don't know what we can do without more data as to what components are 
accessing which files where on disk. strace may be able to help here.

it would also be interesting to know if stopping plasma-desktop with `kquitapp 
plasma-desktop` and then restarting it in a running session reproduces the 
problems, or if it is a one-time thing. there's also krunner, kwin, kded and a 
few other processes that may be culprits if plasma-desktop only ends up being 
part of the issue (or not really involved at all).

-- 
Aaron J. Seigo
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