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GTK supports profiling with sysprof. It exports timing information about frameclock phases and various characteristics of GskRenders in a format that can be displayed by sysprof or GNOME Builder.
A simple way to capture data is to set the
GTK_TRACE
environment variable. When it is set,
GTK will write profiling data to a file called
gtk.PID.syscap
.
When launching the application from sysprof, it will set the
SYSPROF_TRACE_FD
environment variable to point
GTK at a file descriptor to write profiling data to.
When GtkApplication registers with D-Bus, it exports the
org.gnome.Sysprof2.Profiler
D-Bus interface
that lets sysprof request profiling data at runtime.