Add performance tests

Signed-off-by: Thomas Lauf <thomas.lauf@tngtech.com>

test/performance-plot.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+import argparse
+import os
+
+import matplotlib.pyplot as plt
+import numpy as np
+
+parser = argparse.ArgumentParser(description='Display performance plots.')
+parser.add_argument('output_dir',
+                    help='directory containing the measurement files')
+
+args = parser.parse_args()
+
+output_directory = args.output_dir
+
+plt.axes([0.1, 0.1, 0.6, 0.75])
+plt.xlabel("# database entries")
+plt.ylabel("time [s]")
+plt.title("timew performance")
+
+for filename in os.listdir(output_directory):
+    if filename.endswith(".log"):
+        cmd = "-".join(filename.split('-')[1:-1])
+        try:
+            x, y = np.loadtxt(os.path.join(output_directory, filename),
+                              delimiter='\t',
+                              usecols=(1, 2),
+                              unpack=True)
+            plt.plot(x, y, label=cmd, marker=".", linestyle='')
+        except ValueError as e:
+            print("Invalid file: {} {}".format(filename, e))
+
+plt.legend(bbox_to_anchor=(1.05, 1), loc='upper left', borderaxespad=0., ncol=2)
+plt.show()