Hello,
I'm having huge performance issues using GTK under Win32, that were bereable so far but are becoming very problematic today. Either GTK is very slow either we're doing something wrong (I hope). The problem is that I cannot locate the exact reason of those performances issues. It could be Win32, this specific version of GTK, GtkGlExt, the way we run our mainloop, the way I setup my widgets, etc. So I'll give a general introduction, in the hope that some of you could spot a common problem or assist me in improving the thing. Sorry if some parts are unclear. Summary: - Updating a few simple widgets in main loop knock framerate down by a more than signifiant amount. Our setup: - Installed 2.6.4 precompiled package from: http://gladewin32.sourceforce.net/ Contains GTK+ 2.6.4, associated glib, pango, etc. - Along with GtkGLExt 1.0.6 from: http://gtkglext.sourceforge.net/ - Compiling with MSVC 7.1. - Computer: Pentium 4, 3000 Mz, 1 GB RAM, Radeon 9800 Pro video card with proper drivers installed. - Operating system: Windows XP SP2. We we do: - I have a C++ program running a mainloop. The mainloop periodically call gtk_main_iteration_do() - Single threaded - The interface itself is a screen filling application with 2 OpenGL areas (using GtkGLExt) and various GTK widgets on all sides. - The application shows information in widget that gets updated in realtime (say, 60 times per second). I made a capture so you can get an idea of how it looks like: http://www.miracleworld.net/misc/code/gtktool-20051017-01.png Mainloop is something like: initialize interface, create widgets, etc. while (!user_asked_to_quit) { gtk_main_iteration_do(FALSE); update logic; // This sets the value of various widgets gdk_gl_drawable_gl_begin(gl_area); // gl drawing... gdk_gl_drawable_gl_end(gl_area); } What takes times: 1. In picture you can see a dozen of GtkSpinButton on the left side. Whenever one of them gets its value changed in the main loop - using gtk_spin_button_set_value() - frame rate goes down. To get you an idea, I get from ~180 to ~40 FPS by updating two (2) of those widgets in the mainloop. Updating more widgets gets me even slower frame rate. 2. I have a GtkStatusBar in the bottom. Calling gtk_statusbar_pop()/gtk_statusbar_push() on each main loop iteration also make the framerate drop from ~180 to ~100 FPS. The closest reference I could find is in this mailing list thread, posted in 2003 and coincidentally related to GtkGTExt: http://mail.gnome.org/archives/gtk-app-devel-list/2003-November/msg00046.html I tried to remove my GL drawing area and got the same problem, so I don't think it's related to GL. I am under the impression that few application have auto-updating widgets so it may be an uncommon case to notice those performances problems. Questions: - It is normal, accepted GTK behavior? - I am doing something obviously wrong, or do you have any suggestion or what I should check or refer to? - Do you have pointers to similar application that could refresh their Gtk widgets on a regular basis? Thank you greatly, Omar Cornut _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
