Add tasks_size_overhead output example

doc/doxygen/Makefile.am

@@ -1,6 +1,6 @@
 # StarPU --- Runtime system for heterogeneous multicore architectures.
 #
-# Copyright (C) 2009, 2011  Université de Bordeaux 1
+# Copyright (C) 2009, 2011, 2013  Université de Bordeaux 1
 # Copyright (C) 2010, 2011, 2012, 2013  Centre National de la Recherche Scientifique
 #
 # Permission is granted to copy, distribute and/or modify this document
@@ -138,6 +138,8 @@ EXTRA_DIST	= 		\
 	$(chapters) 		\
 	chapters/version.sty	\
 	chapters/version.html	\
+	chapters/tasks_size_overhead.png	\
+	chapters/tasks_size_overhead.eps	\
 	doxygen.cfg 		\
 	refman.tex
 

doc/doxygen/chapters/building.doxy

@@ -266,11 +266,14 @@ schedulers, for instance <c>STARPU_SCHED=dmda</c>.
 
 \subsection TaskSizeOverhead Task Size Overhead
 
-This benchmark gives a glimpse into how big a size should be for StarPU overhead
-to be low enough.  Run <c>tasks_size_overhead.sh</c>, it will generate a plot
+This benchmark gives a glimpse into how long a task should be (in µs) for StarPU overhead
+to be low enough to keep efficiency.  Run <c>tasks_size_overhead.sh</c>, it will generate a plot
 of the speedup of tasks of various sizes, depending on the number of CPUs being
 used.
 
+\image html tasks_size_overhead.png
+\image latex tasks_size_overhead.eps "" width=\textwidth
+
 \subsection DataTransferLatency Data Transfer Latency
 
 <c>local_pingpong</c> performs a ping-pong between the first two CUDA nodes, and

doc/doxygen/doxygen-config.cfg.in

@@ -63,3 +63,4 @@ INPUT_FILTER           = @top_builddir@/doc/doxygen/doxygen_filter.sh
 
 LATEX_HEADER           = @top_srcdir@/doc/doxygen/refman.tex
 
+IMAGE_PATH             = @top_srcdir@/doc/doxygen/chapters

doc/doxygen/doxygen.cfg

@@ -774,7 +774,8 @@ EXAMPLE_RECURSIVE      = NO
 # directories that contain image that are included in the documentation (see
 # the \image command).
 
-IMAGE_PATH             =
+# From @INCLUDE, above
+#IMAGE_PATH             =
 
 # The INPUT_FILTER tag can be used to specify a program that doxygen should
 # invoke to filter for each input file. Doxygen will invoke the filter program