Add gnuplot script for plotting benchmark results

Orthtree/benchmark/Orthtree/construction.cpp

@@ -32,7 +32,7 @@ int main(int argc, char **argv) {
   file << "Number of Points,Build Time (ms) \n";
 
   // Perform tests for various dataset sizes
-  for (size_t num_points = 10; num_points < 1000000; num_points *= 1.1) {
+  for (size_t num_points = 10; num_points < 10000000; num_points *= 1.1) {
 
     // Create a collection of the right number of points
     auto points = generate<Kernel>(num_points);

Orthtree/benchmark/Orthtree/nearest_neighbor.cpp

@@ -56,6 +56,8 @@ int main(int argc, char **argv) {
 
     file << num_points << ",";
     file << duration_cast<microseconds>(end - start).count() << "\n";
+
+    std::cout << num_points << std::endl;
   }
 
   file.close();

Orthtree/benchmark/Orthtree/plot_construction_benchmark.p

@@ -0,0 +1,17 @@
+
+reset
+
+set terminal png size 800,500
+set output 'construction_benchmark.png'
+
+set grid
+set style data lines
+#set logscale x
+
+set title 'Time to construct a tree from points'
+set xlabel "Number of points"
+set ylabel "Time (ms)"
+set key autotitle columnhead
+
+set datafile separator ","
+plot 'construction_benchmark.csv'