message: Update the performance test case
diff: @@ -56,8 +56,8 @@ def timeit(fn, msg, N=0):
  return res
  -width = 10
  -depth = 2
  +width = 1000
  +depth = 20
  class MatchingFilesDatasetTest(test.TestCase):
  @@ -219,7 +219,9 @@ class MatchingFilesDatasetTest(test.TestCase):
  get_next = iterator.get_next()
  result = []
  with self.cached_session() as sess:
  - search_patterns = [base + "/*/*/*.txt"]
  + pattern = '{}/{}/*.txt'\
  + .format(base, os.path.join(*['**' for _ in range(depth)]))
  + search_patterns = [pattern]
  sess.run(init_op, feed_dict={patterns: search_patterns})
  result.extend(timeit(partial(self._read_data_with_result, get_next, sess),
  "read first filename"))
  @@ -231,8 +233,6 @@ class MatchingFilesDatasetTest(test.TestCase):
  result.extend(filename)
  matched_filenames = [compat.as_bytes(x) for x in result]
  - for file in matched_filenames:
  - print(file)
  self.assertItemsEqual(matched_filenames, test_filenames)
  