Dear Wayne,
> I have display apps in both "C" and "Tcl/Tk/Blt"
> and even the Tcl/TK code uses only a few percent of the CPU while the
> Xserver can easily use 60-80%.
>
> My partial solution was to run the Xserver on a networked laptop running
> the Xserver as an X terminal with:
>
> X -query realtime-machine.net
Thanks for your valuable advice. I did a retry of both fltk and labview
with separate Linux PC's for the Xserver and application.
For the dedicated fltk code I obtained similar results as before; X was
(maybe surprisingly) not a major factor here, and I assume the network
overhead compensated for the missing Xserver.
For Labview, the strip-mode performed much better with split X/labview
but the difference for scope and sweep mode was minor as labview was
already dominating the CPU:
CPU-usage (labview) CPU-usage (X)
realtime-machine display-machine display speed
strip 28 % 100 % 100-1200 pixel/second
scope 100 % 18 % 5700-6700 pixel/second
sweep 100 % 28 % 5600-6100 pixel/second
(both PC's are Pro-180MHz)
It has also been reported to me that using block-mode updates
would be much faster under Labview but I did not manage to do
this - Labview dumped core and I gave up (commercial software
creating core dumps always leaves me very worried - it
really destroys my belief in anything mankind has ever made :-).
> RT/linux is great!!!!!!! :-)
I agree - many thanks to the authors!
Regards,
Arnold.
--
A.J. Niessen | Philips Research Laboratories
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Phone: (+31-40-27)42715/43173 | 5656 AA Eindhoven
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