Hi,
bad news related to the OSX Client.
I just finished implementing a SDL "alpha-" backend for the gtk widget.
as I did not figure out how to draw into an existing window I was
opening a new windows using SDL and implemented a draw-function for my
spice-widget-sdl.c that simply takes the pixman data and draws it into
the SDL window. SDL uses opengl to for accelerated 2d drawing on my OSX
machine.
Measuring the performance I figuread out that the SDL was in fact faster
than the quartz backend of cairo. However the look and feel did not
change at all :(
Even with accelerated rendering there is almost no difference between
cairo/quartz and sdl/opengl drawing. I was woundering if you had any
idea how I can proceed. I don´t know the spice client that good to know
exactly where to look next.
Here you find the opengl variant of my SDL drawing graph:
http://wwwlehre.dhbw-stuttgart.de/~lombardo/spicex_draw_event_opengl.png
Here was the call tree with execution time for the quartz backend:
http://wwwlehre.dhbw-stuttgart.de/~lombardo/exp_call_tree_spicy.png
So I came from 65,9% of processing time to 42,1% for the
spicex_draw_event() function. But there is absolutely no effect visible
for the user.
Any hint would be great!
Thanks in advance,
Mario
Am 16.10.2013 10:37, schrieb Mario:
Hi,
I just took a look into those functions that are not seem to be
involved in performance issues. Until today I stopped at the
gdk_window_update_idle() as this call is suggestive of being innocent.
I thought it may sleep.
However this calling thread seem to create the performance issue on
OSX.
Attached you´ll find the time analysis of the spicy client (as png as
text exports of this software are not really clear).
Deep inside the gdk_window_update_idle() the drawing function
spicex_draw_event() is called that actually consumes 65% of the whole
execution time.
Inside cairo_fill() the CGContextDrawImage() is called for the quartz
backend and this seem to be the root of all evil. ;-)
Is there any other approach to display the spice-widget content to the
screen?
Thanks in advance,
Mario
Am 07.10.2013 11:55, schrieb Mario Lombardo:
Hi,
I just compiled the spice-gtk client (spicy) on OSX
(http://www.spice-space.org/page/OSX_Client/Build).
I am able to connect to the spice server using this client but it is
more slow than any VNC client I know.
I looked into the code and found two different places where this
client seems to be different than the x11 or GDI versions:
1.) It uses sw_canvas.c
2.) It uses spice-widget-cairo.c
Is it possible that the slow rendering results in the execution time
one of those two files? Which investigation would make more sense:
Would it be better to provide a SDL cairo version or should it
accelerate the client when there is a canvas option optimized for OSX
(quarz I guess)? Is it possible to test the gl canvas on OSX? I didn´t
found anything about the gl implementation in the configure script.
Thank you.
Mario
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