| <!DOCTYPE html> |
| <!-- |
| Copyright 2016 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. |
| --> |
| |
| <link rel="import" href="/tracing/metrics/metric_registry.html"> |
| <link rel="import" href="/tracing/value/histogram.html"> |
| |
| <script> |
| 'use strict'; |
| |
| tr.exportTo('tr.metrics.sh', function() { |
| /** |
| * This metric measures total CPU time for Chrome processes, per second of |
| * clock time. |
| * This metric requires only the 'toplevel' tracing category. |
| * |
| * @param {!tr.v.ValueSet} values |
| * @param {!tr.model.Model} model |
| * @param {!Object=} optOptions |
| */ |
| function cpuTimeMetric(values, model, optOptions) { |
| var rangeOfInterest = optOptions ? optOptions.rangeOfInterest : undefined; |
| var allProcessCpuTime = 0; |
| |
| for (var pid in model.processes) { |
| var process = model.processes[pid]; |
| var processCpuTime = 0; |
| for (var tid in process.threads) { |
| var thread = process.threads[tid]; |
| var threadCpuTime = 0; |
| thread.sliceGroup.topLevelSlices.forEach(function(slice) { |
| if (rangeOfInterest && |
| !rangeOfInterest.intersectsExplicitRangeInclusive( |
| slice.start, slice.end)) |
| return; |
| threadCpuTime += slice.cpuDuration; |
| }); |
| processCpuTime += threadCpuTime; |
| } |
| allProcessCpuTime += processCpuTime; |
| } |
| |
| // Normalize cpu time by clock time. |
| var normalizationRange = rangeOfInterest ? |
| rangeOfInterest : model.bounds.range; |
| var MILLISECONDS_PER_SECOND = 1000; |
| var clockTimeInSeconds = normalizationRange / MILLISECONDS_PER_SECOND; |
| |
| // Use a minimum clock time of 0.0001 to allow 0-sized ranges. |
| clockTimeInSeconds = Math.max(clockTimeInSeconds, 0.0001); |
| var normalizedAllProcessCpuTime = allProcessCpuTime / |
| clockTimeInSeconds; |
| |
| var unit = tr.b.Unit.byName.timeDurationInMs_smallerIsBetter; |
| var boundaries = tr.v.HistogramBinBoundaries |
| .createExponential(1, 100000, 200) |
| var cpuTimeNumeric = new tr.v.Histogram('cpu_time', unit, boundaries); |
| cpuTimeNumeric.description = |
| 'Total CPU time on all Chrome processes, per second of clock time.'; |
| cpuTimeNumeric.addSample(normalizedAllProcessCpuTime); |
| values.addHistogram(cpuTimeNumeric); |
| } |
| |
| tr.metrics.MetricRegistry.register(cpuTimeMetric, { |
| supportsRangeOfInterest: true |
| }); |
| |
| return { |
| cpuTimeMetric: cpuTimeMetric, |
| }; |
| }); |
| </script> |
