diff options
Diffstat (limited to 'media/webrtc/trunk/build/android/pylib/json_perf_parser.py')
-rw-r--r-- | media/webrtc/trunk/build/android/pylib/json_perf_parser.py | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/media/webrtc/trunk/build/android/pylib/json_perf_parser.py b/media/webrtc/trunk/build/android/pylib/json_perf_parser.py new file mode 100644 index 000000000..1a8e61753 --- /dev/null +++ b/media/webrtc/trunk/build/android/pylib/json_perf_parser.py @@ -0,0 +1,160 @@ +# Copyright (c) 2012 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. + + +"""A helper module for parsing JSON objects from perf tests results.""" + +import json + + +def GetAverageRunInfo(json_data, name): + """Summarizes TraceEvent JSON data for performance metrics. + + Example JSON Inputs (More tags can be added but these are required): + Measuring Duration: + [ + { "cat": "Java", + "ts": 10000000000, + "ph": "S", + "name": "TestTrace" + }, + { "cat": "Java", + "ts": 10000004000, + "ph": "F", + "name": "TestTrace" + }, + ... + ] + + Measuring Call Frequency (FPS): + [ + { "cat": "Java", + "ts": 10000000000, + "ph": "I", + "name": "TestTraceFPS" + }, + { "cat": "Java", + "ts": 10000004000, + "ph": "I", + "name": "TestTraceFPS" + }, + ... + ] + + Args: + json_data: A list of dictonaries each representing a JSON object. + name: The 'name' tag to filter on in the JSON file. + + Returns: + A dictionary of result data with the following tags: + min: The minimum value tracked. + max: The maximum value tracked. + average: The average of all the values tracked. + count: The number of times the category/name pair was tracked. + type: The type of tracking ('Instant' for instant tags and 'Span' for + begin/end tags. + category: The passed in category filter. + name: The passed in name filter. + data_points: A list of all of the times used to generate this data. + units: The units for the values being reported. + + Raises: + Exception: if entry contains invalid data. + """ + + def EntryFilter(entry): + return entry['cat'] == 'Java' and entry['name'] == name + filtered_entries = filter(EntryFilter, json_data) + + result = {} + + result['min'] = -1 + result['max'] = -1 + result['average'] = 0 + result['count'] = 0 + result['type'] = 'Unknown' + result['category'] = 'Java' + result['name'] = name + result['data_points'] = [] + result['units'] = '' + + total_sum = 0 + + last_val = 0 + val_type = None + for entry in filtered_entries: + if not val_type: + if 'mem' in entry: + val_type = 'mem' + + def GetVal(entry): + return entry['mem'] + + result['units'] = 'kb' + elif 'ts' in entry: + val_type = 'ts' + + def GetVal(entry): + return float(entry['ts']) / 1000.0 + + result['units'] = 'ms' + else: + raise Exception('Entry did not contain valid value info: %s' % entry) + + if not val_type in entry: + raise Exception('Entry did not contain expected value type "%s" ' + 'information: %s' % (val_type, entry)) + val = GetVal(entry) + if (entry['ph'] == 'S' and + (result['type'] == 'Unknown' or result['type'] == 'Span')): + result['type'] = 'Span' + last_val = val + elif ((entry['ph'] == 'F' and result['type'] == 'Span') or + (entry['ph'] == 'I' and (result['type'] == 'Unknown' or + result['type'] == 'Instant'))): + if last_val > 0: + delta = val - last_val + if result['min'] == -1 or result['min'] > delta: + result['min'] = delta + if result['max'] == -1 or result['max'] < delta: + result['max'] = delta + total_sum += delta + result['count'] += 1 + result['data_points'].append(delta) + if entry['ph'] == 'I': + result['type'] = 'Instant' + last_val = val + if result['count'] > 0: result['average'] = total_sum / result['count'] + + return result + + +def GetAverageRunInfoFromJSONString(json_string, name): + """Returns the results from GetAverageRunInfo using a JSON string. + + Args: + json_string: The string containing JSON. + name: The 'name' tag to filter on in the JSON file. + + Returns: + See GetAverageRunInfo Returns section. + """ + return GetAverageRunInfo(json.loads(json_string), name) + + +def GetAverageRunInfoFromFile(json_file, name): + """Returns the results from GetAverageRunInfo using a JSON file. + + Args: + json_file: The path to a JSON file. + name: The 'name' tag to filter on in the JSON file. + + Returns: + See GetAverageRunInfo Returns section. + """ + with open(json_file, 'r') as f: + data = f.read() + perf = json.loads(data) + + return GetAverageRunInfo(perf, name) |