Re: decrease widget show time

[czk <czongke gmail com>]

Following is my test program and test result:
--------------------------------------------------------
#include <gtk/gtk.h>

static const char *text[] = {
   "hello, world",
   "nihao entry",
   "Slide and release",
   "the power switch to wake",
   "become impassioned or",
   "excited: the young man"
};

static void
button_clicked (GtkWidget *widget, gpointer data)
{
  g_print ("button %p clicked, data="" widget, (gint)data);
}

int main (int argc, char *argv[])
{
  GtkWidget *window;
  GtkWidget *vbox;
  GtkWidget *button;
  int        i;
  gint64     t[20];
  gint       cnt = 0;

  gtk_init (&argc, &argv);
  
  t[cnt++] = g_get_monotonic_time ();
  gtk_settings_get_for_screen (gdk_screen_get_default ());
  t[cnt++] = g_get_monotonic_time (); 
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_size_request (window, 300, 400);
  t[cnt++] = g_get_monotonic_time ();
  vbox = gtk_vbox_new (FALSE, 5);
  gtk_widget_show (vbox);
  t[cnt++] = g_get_monotonic_time ();
  for (i = 0; i < 5; i++)
  {
    button = gtk_button_new_with_label (text[i]);
    gtk_widget_show (button);

    g_signal_connect (button, "clicked", G_CALLBACK (button_clicked), (gpointer)i);

    gtk_box_pack_start (GTK_BOX(vbox), button, TRUE, FALSE, 5);
  }

  gtk_container_add (GTK_CONTAINER (window), vbox);
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  t[cnt++] = g_get_monotonic_time ();
  gtk_widget_show (window);
  t[cnt++] = g_get_monotonic_time ();

  gdk_window_process_updates (gtk_widget_get_window (window), TRUE);
  t[cnt++] = g_get_monotonic_time ();

  g_print("time(cnt=%d)(start=%lld): ", cnt, t[0]/1000);
  for (i = 1; i < cnt; i++)
    g_print("[%d]=%lld ", i, (t[i] - t[i-1])/1000);
  g_print("total=%lld (end=%lld)\n", (t[i-1] - t[0])/1000, t[i-1]/1000);

  gtk_main ();

  return 0;
}
-------------------------------
the result is:
time(cnt=7)(start=5830680): [1]=210 [2]=110 [3]=10 [4]=140 [5]=1430 [6]=270 total=2170 (end=5832850)

cat /proc/cupinfo

Processor       : ARMv6-compatible processor rev 7 (v6l)

BogoMIPS        : 323.58

Features        : swp half thumb fastmult vfp edsp java 

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xb76

CPU revision    : 7

Hardware        : Reference Board for TV/STB SoC

Revision        : 0000

Serial          : 0000000000000000

===================================
Obviously, most time spend on the last gtk_widget_show.

2011/3/20 Markku Vire <markku vire iki fi>

Hi,

On Fri, 2011-03-18 at 14:13 +0800, czk wrote:

> hello everyone,
> I use gtk+-3.0 in a embedded device. If I create a window put 4
> buttons , 4 entrys  3 labels in it, from gtk_window_new to the window
> was showed spend 4 seconds totally. It a long time for me. Most time
> spend in gtk_widget_show_all.
>
> Less than 1.5 second can acceptable. Any one has ideas? Thanks.

Sounds like you're searching the reason from a wrong place. The core Gtk
functions like gtk_widget_show_all consume practically no time by
themselves (even on embedded device). It's far more likely that you
encounter some hidden "lazy" initialization. For example, on Gtk+2.0 the
theme parsing and realization took place when you first time tried to
show a toplevel.

cheers,

-Markku-