debug-viewer: add more logging and some profiling how-to

The port is much slower than the gtk3 version. Try to figure why.

debug-viewer/GstDebugViewer/Data.py

@@ -460,7 +460,7 @@ class LogFile (Producer):
         self.have_load_started ()
 
     def handle_load_finished (self):
-
+        self.logger.debug ("finish loading")
         self.lines = LogLines (self.fileobj, self.line_cache)
 
         # Chain up to our consumers:

debug-viewer/GstDebugViewer/GUI/window.py

@@ -908,6 +908,7 @@ class Window (object):
                              _("It is not a GStreamer log file."))
 
         def idle_set ():
+            self.logger.debug ("idle trigger after load finished")
             self.log_view.set_model (self.log_filter)
 
             self.line_view.handle_attach_log_file (self)

debug-viewer/README

@@ -21,6 +21,16 @@ NEW: column.pack_start (cell, True)
 OLD: view_column.get_cell_renderers ()
 NEW: column.get_cells ()
 
-= porting ressources =
+# porting ressources #
 https://www.xpra.org/trac/ticket/90?cversion=0&cnum_hist=3
-https://mail.gnome.org/archives/commits-list/2013-October/msg05205.html
+https://mail.gnome.org/archives/commits-list/2013-October/msg05205.html
+
+#  profiling #
+python -m profile -o output.pstats path/to/your/script arg1 arg2
+gprof2dot.py -f pstats output.pstats | dot -Tpng -o output.png
+~/projects/tools/gprof2dot/gprof2dot.py -f pstats output.pstats | dot -Tpng -o output.png
+eog output.png
+
+python -m cProfile -o output.pstats2 ./gst-debug-viewer debug.noansi.log
+~/projects/tools/gprof2dot/gprof2dot.py -f pstats output.pstats2 | dot -Tpng -o output2.png
+eog output2.png