Hi,
On 13 oct. 09, at 22:32, Norbert Nemec wrote:
In fact, I found a clear measurement that indicates a problem:
Running TeXmacs/Qt on my fairly modern notebook (fully optimized
compile).
I fill one page with plain text. Now simply moving through the text
with the right arrow (no editing!) brings up the CPU load to 100%.
Of this, 95% are spent in the X server. TeXmacs itself only takes 5%
of the CPU power.
I can confirm this observation. In my ubuntu virtual machine
(VirtualBox/MacOSX) the above protocol gives \sim 75% CPU load to Xorg
and \sim 23% to texmacs. You should check that you do not use cairo
since at the moment the cairo rendering is slightly unoptimal in QT
(explicit and naive double-buffer).
On my mac the load remains reasonable (30% which should include the
GUI load also since the total CPU load is not much higher).
Proprer implementation of check_event require knowing if there are
pending key events in the queue and this is not possible in Qt (or
even in Cocoa). Moderns GUI API explicitly discurage looking at the
event queue so we should design a different mechanism to reimplement
what it is currently done in the X11 port.
best
max
I tried activating the code in check_event. The display is
incomplete now, but the CPU load is down to 30% and TeXmacs feels
fully reactive.
Seems like this optimization is crucial not only for slow machines
after all...
Greetings,
Norbert
Joris van der Hoeven wrote:
On Tue, Oct 13, 2009 at 05:14:02PM +0200, Álvaro Tejero Cantero
wrote:
I didn't notice any problems, but TeXmacs-QT feels slower already
when
typing at the end of 3-line paragraphs.
That is shortcoming of the current Qt version:
interrupts during the rendering phase have not yet been implemented.
Now that delayed_event has become cleaner, maybe Max can fix that
one too.
Is there any more quantitative way to test performance?
This is rather a matter of reactivity. Hard to measure.
Best wishes, --Joris
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