1 files changed, 58 insertions, 0 deletions
diff --git a/tools/profiling/microbenchmarks/bm_diff/bm_speedup.py b/tools/profiling/microbenchmarks/bm_diff/bm_speedup.py
new file mode 100755
index 0000000000..63e691af02
--- /dev/null
+++ b/tools/profiling/microbenchmarks/bm_diff/bm_speedup.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python2.7
+#
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from scipy import stats
+import math
+
+_DEFAULT_THRESHOLD = 1e-10
+
+def scale(a, mul):
+  return [x * mul for x in a]
+
+
+def cmp(a, b):
+  return stats.ttest_ind(a, b)
+
+
+def speedup(new, old, threshold = _DEFAULT_THRESHOLD):
+  if (len(set(new))) == 1 and new == old: return 0
+  s0, p0 = cmp(new, old)
+  if math.isnan(p0): return 0
+  if s0 == 0: return 0
+  if p0 > threshold: return 0
+  if s0 < 0:
+    pct = 1
+    while pct < 100:
+      sp, pp = cmp(new, scale(old, 1 - pct / 100.0))
+      if sp > 0: break
+      if pp > threshold: break
+      pct += 1
+    return -(pct - 1)
+  else:
+    pct = 1
+    while pct < 10000:
+      sp, pp = cmp(new, scale(old, 1 + pct / 100.0))
+      if sp < 0: break
+      if pp > threshold: break
+      pct += 1
+    return pct - 1
+
+
+if __name__ == "__main__":
+  new = [0.0, 0.0, 0.0, 0.0] 
+  old = [2.96608e-06, 3.35076e-06, 3.45384e-06, 3.34407e-06]
+  print speedup(new, old, 1e-5)
+  print speedup(old, new, 1e-5)