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1 # Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 # Use of this source code is governed by a BSD-style license that can be | |
3 # found in the LICENSE file. | |
4 | |
5 | |
6 """A helper module for parsing JSON objects from perf tests results.""" | |
7 | |
8 import json | |
9 | |
10 | |
11 def GetAverageRunInfo(json_data, name): | |
12 """Summarizes TraceEvent JSON data for performance metrics. | |
13 | |
14 Example JSON Inputs (More tags can be added but these are required): | |
15 Measuring Duration: | |
16 [ | |
17 { "cat": "Java", | |
18 "ts": 10000000000, | |
19 "ph": "S", | |
20 "name": "TestTrace" | |
21 }, | |
22 { "cat": "Java", | |
23 "ts": 10000004000, | |
24 "ph": "F", | |
25 "name": "TestTrace" | |
26 }, | |
27 ... | |
28 ] | |
29 | |
30 Measuring Call Frequency (FPS): | |
31 [ | |
32 { "cat": "Java", | |
33 "ts": 10000000000, | |
34 "ph": "I", | |
35 "name": "TestTraceFPS" | |
36 }, | |
37 { "cat": "Java", | |
38 "ts": 10000004000, | |
39 "ph": "I", | |
40 "name": "TestTraceFPS" | |
41 }, | |
42 ... | |
43 ] | |
44 | |
45 Args: | |
46 json_data: A list of dictonaries each representing a JSON object. | |
47 name: The 'name' tag to filter on in the JSON file. | |
48 | |
49 Returns: | |
50 A dictionary of result data with the following tags: | |
51 min: The minimum value tracked. | |
52 max: The maximum value tracked. | |
53 average: The average of all the values tracked. | |
54 count: The number of times the category/name pair was tracked. | |
55 type: The type of tracking ('Instant' for instant tags and 'Span' for | |
56 begin/end tags. | |
57 category: The passed in category filter. | |
58 name: The passed in name filter. | |
59 data_points: A list of all of the times used to generate this data. | |
60 units: The units for the values being reported. | |
61 | |
62 Raises: | |
63 Exception: if entry contains invalid data. | |
64 """ | |
65 | |
66 def EntryFilter(entry): | |
67 return entry['cat'] == 'Java' and entry['name'] == name | |
68 filtered_entries = filter(EntryFilter, json_data) | |
69 | |
70 result = {} | |
71 | |
72 result['min'] = -1 | |
73 result['max'] = -1 | |
74 result['average'] = 0 | |
75 result['count'] = 0 | |
76 result['type'] = 'Unknown' | |
77 result['category'] = 'Java' | |
78 result['name'] = name | |
79 result['data_points'] = [] | |
80 result['units'] = '' | |
81 | |
82 total_sum = 0 | |
83 | |
84 last_val = 0 | |
85 val_type = None | |
86 for entry in filtered_entries: | |
87 if not val_type: | |
88 if 'mem' in entry: | |
89 val_type = 'mem' | |
90 | |
91 def GetVal(entry): | |
92 return entry['mem'] | |
93 | |
94 result['units'] = 'kb' | |
95 elif 'ts' in entry: | |
96 val_type = 'ts' | |
97 | |
98 def GetVal(entry): | |
99 return float(entry['ts']) / 1000.0 | |
100 | |
101 result['units'] = 'ms' | |
102 else: | |
103 raise Exception('Entry did not contain valid value info: %s' % entry) | |
104 | |
105 if not val_type in entry: | |
106 raise Exception('Entry did not contain expected value type "%s" ' | |
107 'information: %s' % (val_type, entry)) | |
108 val = GetVal(entry) | |
109 if (entry['ph'] == 'S' and | |
110 (result['type'] == 'Unknown' or result['type'] == 'Span')): | |
111 result['type'] = 'Span' | |
112 last_val = val | |
113 elif ((entry['ph'] == 'F' and result['type'] == 'Span') or | |
114 (entry['ph'] == 'I' and (result['type'] == 'Unknown' or | |
115 result['type'] == 'Instant'))): | |
116 if last_val > 0: | |
117 delta = val - last_val | |
118 if result['min'] == -1 or result['min'] > delta: | |
119 result['min'] = delta | |
120 if result['max'] == -1 or result['max'] < delta: | |
121 result['max'] = delta | |
122 total_sum += delta | |
123 result['count'] += 1 | |
124 result['data_points'].append(delta) | |
125 if entry['ph'] == 'I': | |
126 result['type'] = 'Instant' | |
127 last_val = val | |
128 if result['count'] > 0: result['average'] = total_sum / result['count'] | |
129 | |
130 return result | |
131 | |
132 | |
133 def GetAverageRunInfoFromJSONString(json_string, name): | |
134 """Returns the results from GetAverageRunInfo using a JSON string. | |
135 | |
136 Args: | |
137 json_string: The string containing JSON. | |
138 name: The 'name' tag to filter on in the JSON file. | |
139 | |
140 Returns: | |
141 See GetAverageRunInfo Returns section. | |
142 """ | |
143 return GetAverageRunInfo(json.loads(json_string), name) | |
144 | |
145 | |
146 def GetAverageRunInfoFromFile(json_file, name): | |
147 """Returns the results from GetAverageRunInfo using a JSON file. | |
148 | |
149 Args: | |
150 json_file: The path to a JSON file. | |
151 name: The 'name' tag to filter on in the JSON file. | |
152 | |
153 Returns: | |
154 See GetAverageRunInfo Returns section. | |
155 """ | |
156 with open(json_file, 'r') as f: | |
157 data = f.read() | |
158 perf = json.loads(data) | |
159 | |
160 return GetAverageRunInfo(perf, name) | |
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