I hadn't tried that as I assumed that it was off by default unless enabled.. Since a simple test program doesn't show it,. but my app does and the performance hogging goes away when I comment out one line (gtk_label_set_text) the problem appears to be internal to GTK> Another fine fellow suggested it may be due to resizing of widgets caused by the label update, and showed me a way to set it to a fixed size, but that ahd no effect on cpu usage (still high). I managed to create a workaround by useing a GtkEntry instead, and working out some trickery to make the entrie's background color (normally white) to match it's parent so it blends in and looks like a label, and presto, cpu usage went from 40-45% down to 4 %. For some reason in my case the label updates seem to be triggering some internal stuff for no good reason. when I get a little time I'll try to extract that section of code int oan isolated test case, and if it still shows that I'll file it as a GTK+ bug. (Again) NOTE these problems (high cpu) exist on both linux and Win32 platforms, as my app goes both ways. --- Paul Davis <pjdavis@xxxxxxxxxxxxxxxxxxxxx> wrote: > On 3/25/07, David J. Andruczyk <djandruczyk@xxxxxxxxx> wrote: > > Has anyone else noticed excessive cpu usage when updating > certain > > GTK+ (2.10.x) widgets? > > > > I have a piece of software that updates a set of text fields > > (GtkLabel's) and uses progress bars to indicate a quantity > > graphically, and am finding excessively high amounts of CPU > usage > > when these calls are made. Commenting out calls to > > "gtk_label_set_text" and "gtk_progress_bar_set_fraction" > brings > > cpu usage back to near zero levels.. I have profiled my code > > extensively using gprof/memprof and the problem is not inside > of my > > own code fro mwhat the profiler tells me. > > > > I would NOT expect updating approx 10 labels perhaps 5-10 times > per > > second (ie. when data chages) on a 1.8Ghz machine be so cpu > hungry. > > I have code in place ALREADY to prevent unnecessary updates. > > Without that bit of code, cpu usage will easily max the machine > > even at lower update rates. > > > > I can only suspect that it's an internal GTK+ or pango issue, > as my > > own custom widgets (custom automotive gauges, i.e. > > http://megatunix.sourceforge.net/cluster.gif) are far more > > graphically intensive and I can have multiple instances (about > 4-6 > > updating at any one time for this informal test) of them > updating > > at 30x per second and only have a minimal cpu load of about 15% > > > > Does the label or progress bar code use > > gtk_widget_invalidate_region? (I found that to have a major cpu > > penalty when developing my custom widgets so I stopped using it > in > > my design.) > > > > > > > > -- David J. Andruczyk > > > > > > > > > ____________________________________________________________________________________ > > Now that's room service! Choose from over 150,000 hotels > > in 45,000 destinations on Yahoo! Travel to find your fit. > > http://farechase.yahoo.com/promo-generic-14795097 > > _______________________________________________ > > gtk-list mailing list > > gtk-list@xxxxxxxxx > > http://mail.gnome.org/mailman/listinfo/gtk-list > > > > This might be a shot in the dark, but have you tried disabling > pango's > markup processing with this function: > http://developer.gnome.org/doc/API/2.0/gtk/GtkLabel.html#gtk-label-set-use-markup > > HTH, > Paul > -- David J. Andruczyk ____________________________________________________________________________________ Bored stiff? Loosen up... Download and play hundreds of games for free on Yahoo! Games. http://games.yahoo.com/games/front _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
