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1 #!/usr/bin/env python | 1 #!/usr/bin/env python |
2 # Copyright (c) 2014 The Chromium Authors. All rights reserved. | 2 # Copyright (c) 2014 The Chromium Authors. All rights reserved. |
3 # Use of this source code is governed by a BSD-style license that can be | 3 # Use of this source code is governed by a BSD-style license that can be |
4 # found in the LICENSE file. | 4 # found in the LICENSE file. |
5 | 5 |
6 """ Generate bench_expectations file from a given set of bench data files. """ | 6 """ Generate bench_expectations file from a given set of bench data files. """ |
7 | 7 |
8 import argparse | 8 import argparse |
9 import bench_util | 9 import bench_util |
10 import os | 10 import os |
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39 | 39 |
40 def compute_ranges(benches): | 40 def compute_ranges(benches): |
41 """Given a list of bench numbers, calculate the alert range. | 41 """Given a list of bench numbers, calculate the alert range. |
42 | 42 |
43 Args: | 43 Args: |
44 benches: a list of float bench values. | 44 benches: a list of float bench values. |
45 | 45 |
46 Returns: | 46 Returns: |
47 a list of float [lower_bound, upper_bound]. | 47 a list of float [lower_bound, upper_bound]. |
48 """ | 48 """ |
49 avg = sum(benches) / len(benches) | 49 avg = sum(benches)/len(benches) |
50 squared_avg = avg ** 2 | 50 minimum = min(benches) |
51 avg_sum_squared = sum([bench**2 for bench in benches])/len(benches) | 51 maximum = max(benches) |
52 std_dev = (abs(avg_sum_squared - squared_avg) + 0.0001*abs(avg**2)) ** 0.5 | |
53 | 52 |
54 # If the results are normally distributed, 2 standard deviations | 53 return [minimum - diff*RANGE_RATIO_LOWER - avg*ERR_RATIO - ERR_LB, |
55 # captures something like ~95% of the possible range of results I think | 54 maximum + diff*RANGE_RATIO_UPPER + avg*ERR_RATIO + ERR_UB] |
56 return [avg - 2*std_dev, avg + 2*std_dev] | |
57 | 55 |
58 | 56 |
59 def create_expectations_dict(revision_data_points, builder): | 57 def create_expectations_dict(revision_data_points, builder): |
60 """Convert list of bench data points into a dictionary of expectations data. | 58 """Convert list of bench data points into a dictionary of expectations data. |
61 | 59 |
62 Args: | 60 Args: |
63 revision_data_points: a list of BenchDataPoint objects. | 61 revision_data_points: a list of BenchDataPoint objects. |
64 builder: string of the corresponding buildbot builder name. | 62 builder: string of the corresponding buildbot builder name. |
65 | 63 |
66 Returns: | 64 Returns: |
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131 'expected': expected, | 129 'expected': expected, |
132 'lower_bound': lower_bound, | 130 'lower_bound': lower_bound, |
133 'upper_bound': upper_bound}) | 131 'upper_bound': upper_bound}) |
134 | 132 |
135 with open(args.output_file, 'w') as file_handle: | 133 with open(args.output_file, 'w') as file_handle: |
136 file_handle.write('\n'.join(out_lines)) | 134 file_handle.write('\n'.join(out_lines)) |
137 | 135 |
138 | 136 |
139 if __name__ == "__main__": | 137 if __name__ == "__main__": |
140 main() | 138 main() |
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