Tune bench expectation algorithm parameters.

bench/gen_bench_expectations.py

 #!/usr/bin/env python
 # Copyright (c) 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """ Generate bench_expectations file from a given set of bench data files. """
 
 import argparse
 import bench_util
 import os
 import re
 import sys
 
 # Parameters for calculating bench ranges.
-RANGE_RATIO_UPPER = 1.0  # Ratio of range for upper bounds.
-RANGE_RATIO_LOWER = 1.5  # Ratio of range for lower bounds.
-ERR_RATIO = 0.05  # Further widens the range by the ratio of average value.
+RANGE_RATIO_UPPER = 1.2  # Ratio of range for upper bounds.
+RANGE_RATIO_LOWER = 1.8  # Ratio of range for lower bounds.
+ERR_RATIO = 0.08  # Further widens the range by the ratio of average value.
 ERR_ABS = 0.5  # Adds an absolute error margin to cope with very small benches.
 
 # List of bench configs to monitor. Ignore all other configs.
 CONFIGS_TO_INCLUDE = ['simple_viewport_1000x1000',
                       'simple_viewport_1000x1000_gpu',
                       'simple_viewport_1000x1000_scalar_1.100000',
                       'simple_viewport_1000x1000_scalar_1.100000_gpu',
                      ]
 
 
@@ skipping 81 matching lines @@
               'expected': expected,
               'lower_bound': lower_bound,
               'upper_bound': upper_bound})
 
     with open(args.output_file, 'w') as file_handle:
       file_handle.write('\n'.join(out_lines))
 
 
 if __name__ == "__main__":
     main()