bst_vst_heap_vs_hashmap: make graph beautiful

bst-vs-heap-vs-hashmap-gem5-stats

@@ -11,6 +11,7 @@ class Main(common.LkmcCliFunction):
             },
             description='''\
 Convert a BST vs heap stat file into a gnuplot input
+https://github.com/cirosantilli/linux-kernel-module-cheat#bst-vs-heap-vs-hashmap
 ''',
         )
 

bst-vs-heap-vs-hashmap.gnuplot

@@ -1,11 +1,22 @@
 #!/usr/bin/env gnuplot
 
+# https://github.com/cirosantilli/linux-kernel-module-cheat#bst-vs-heap-vs-hashmap
+#
+# A stacked plot with a single xlabel as shown at:
+#
+# * https://tex.stackexchange.com/questions/346882/creating-an-equally-distributed-multiplot-with-gnuplottex
+# * http://gnuplot.sourceforge.net/demo_canvas_5.2/layout.html
+#
+# would be even nicer, but it was hard to get right, and this
+# is pretty good already.
+
 set terminal png noenhanced size 800, 1400
 set output input_noext . ".tmp.png"
 set multiplot layout 5,1 title "\nC++ Heap vs BST vs Hash map insert time" font ",22"
-set xlabel "container size"
+set lmargin 12
-set ylabel "insert time (ns)"
+set label "Insert time (ns)" at screen 0.05,0.5 center front rotate font ",16"
 set title font ",16"
+set format y "%5.0f"
 
 set title "Heap (std::priority_queue)"
 plot input_noext . ".dat" using 1:2 notitle
@@ -22,6 +33,7 @@ set title "Hash map (std::unordered_set)"
 set yrange [*:*]
 plot input_noext . ".dat" using 1:4 notitle
 
-set title "Hash map zoom"
+set xlabel "Container size" font ",16"
+set title "Hash map (zoom)"
 set yrange [0:hashmap_zoom_max]
 plot input_noext . ".dat" using 1:4 notitle