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1 # Copyright 2013 The Chromium Authors. All rights reserved. | 1 # Copyright 2013 The Chromium Authors. All rights reserved. |
2 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
3 # found in the LICENSE file. | 3 # found in the LICENSE file. |
4 | 4 |
5 from metrics import Metric | 5 from metrics import Metric |
6 from telemetry.value import scalar | 6 from telemetry.value import scalar |
7 | 7 |
8 | 8 |
9 class CpuMetric(Metric): | 9 class CpuMetric(Metric): |
10 """Calulates CPU load over a span of time.""" | 10 """Calulates CPU load over a span of time.""" |
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30 # pylint: disable=W0221 | 30 # pylint: disable=W0221 |
31 def AddResults(self, tab, results, trace_name='cpu_utilization'): | 31 def AddResults(self, tab, results, trace_name='cpu_utilization'): |
32 assert self._stop_cpu, 'Must call Stop() first' | 32 assert self._stop_cpu, 'Must call Stop() first' |
33 cpu_stats = _SubtractCpuStats(self._stop_cpu, self._start_cpu) | 33 cpu_stats = _SubtractCpuStats(self._stop_cpu, self._start_cpu) |
34 # Add a result for each process type. | 34 # Add a result for each process type. |
35 for process_type in cpu_stats: | 35 for process_type in cpu_stats: |
36 trace_name_for_process = '%s_%s' % (trace_name, process_type.lower()) | 36 trace_name_for_process = '%s_%s' % (trace_name, process_type.lower()) |
37 cpu_percent = 100 * cpu_stats[process_type] | 37 cpu_percent = 100 * cpu_stats[process_type] |
38 results.AddValue(scalar.ScalarValue( | 38 results.AddValue(scalar.ScalarValue( |
39 results.current_page, 'cpu_utilization.%s' % trace_name_for_process, | 39 results.current_page, 'cpu_utilization.%s' % trace_name_for_process, |
40 '%', cpu_percent, important=False)) | 40 '%', cpu_percent, important=False, higher_is_better=False)) |
41 | 41 |
42 | 42 |
43 def _SubtractCpuStats(cpu_stats, start_cpu_stats): | 43 def _SubtractCpuStats(cpu_stats, start_cpu_stats): |
44 """Computes average cpu usage over a time period for different process types. | 44 """Computes average cpu usage over a time period for different process types. |
45 | 45 |
46 Each of the two cpu_stats arguments is a dict with the following format: | 46 Each of the two cpu_stats arguments is a dict with the following format: |
47 {'Browser': {'CpuProcessTime': ..., 'TotalTime': ...}, | 47 {'Browser': {'CpuProcessTime': ..., 'TotalTime': ...}, |
48 'Renderer': {'CpuProcessTime': ..., 'TotalTime': ...} | 48 'Renderer': {'CpuProcessTime': ..., 'TotalTime': ...} |
49 'Gpu': {'CpuProcessTime': ..., 'TotalTime': ...}} | 49 'Gpu': {'CpuProcessTime': ..., 'TotalTime': ...}} |
50 | 50 |
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70 # Linux kernel starts with a value close to an overflow, so correction is | 70 # Linux kernel starts with a value close to an overflow, so correction is |
71 # necessary. | 71 # necessary. |
72 if total_time < 0: | 72 if total_time < 0: |
73 total_time += 2**32 | 73 total_time += 2**32 |
74 # Assert that the arguments were given in the correct order. | 74 # Assert that the arguments were given in the correct order. |
75 assert total_time > 0 and total_time < 2**31, ( | 75 assert total_time > 0 and total_time < 2**31, ( |
76 'Expected total_time > 0, was: %d' % total_time) | 76 'Expected total_time > 0, was: %d' % total_time) |
77 cpu_usage[process_type] = float(cpu_process_time) / total_time | 77 cpu_usage[process_type] = float(cpu_process_time) / total_time |
78 return cpu_usage | 78 return cpu_usage |
79 | 79 |
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