Debugging perf regression after refactoring

webrtc/analyze_results.py

+from collections import defaultdict
+import re
+
+f = open("mac_same.txt")
+field = 'media_bitrate'
+
+sum_x = defaultdict(float)
+sum_xx = defaultdict(float)
+cnt = defaultdict(int)
+
+for line in f:
+  line = line.strip()
+  if line.startswith('[ RUN'):
+    test = line[line.find('.') + 1:-2]
+  if line.startswith('RESULT ' + field):
+    avg = re.search('([\d.]+)', line)
+    avg = float(avg.group(1))
+    sum_x[test] += avg
+    sum_xx[test] += avg * avg
+    cnt[test] += 1
+
+f.close()
+
+for test in sorted(sum_x.keys()):
+  avg_x = sum_x[test] / cnt[test]
+  avg_xx = sum_xx[test] / cnt[test]
+  print "{:43}  {:.1f} +- {:.1f}  (n={})".format(
+      test, avg_x, (avg_xx - avg_x * avg_x) ** 0.5, cnt[test])
+
+def show_change(test_prefix):
+  master = sum_x[test_prefix + '_Master']
+  mod = sum_x[test_prefix + '_Mod']
+  before = sum_x[test_prefix + '_Before']
+  print "{:30} master: {:4.1f}%  mod: {:4.1f}".format(
+      test_prefix,
+      (master / before - 1.) * 100,
+      (mod / before - 1.) * 100)
+
+print
+print "Increase after the new patch:"
+show_change('ScreenshareSlidesVP8_2TL')