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Adding ETW trace processor to find chrome.exe idle wakeups
An idle wakeup is when a CPU goes from idle to running code. These can be energy intensive because they suggest that the CPU was in a potentially low power state and was then forced to run code.
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| /* | ||
| Copyright 2021 Google Inc. All Rights Reserved. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
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| // Detect idle wakeups in Chrome in an ETW using TraceProcessing | ||
| // Explanations of the techniques can be found here: | ||
| // https://randomascii.wordpress.com/2020/01/05/bulk-etw-trace-analysis-in-c/ | ||
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| // See this blog post for details of the Trace Processor package used to | ||
| // drive this: | ||
| // https://blogs.windows.com/windowsdeveloper/2019/05/09/announcing-traceprocessor-preview-0-1-0/ | ||
| // Note that this URL has changed once already, so caveat blog lector | ||
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| using Microsoft.Windows.EventTracing; | ||
| class IdleWakeups | ||
| { | ||
| static void Main(string[] args) | ||
| { | ||
| foreach (string traceName in args) | ||
| { | ||
| Console.WriteLine("Processing trace '{0}'", traceName); | ||
| var settings = new TraceProcessorSettings | ||
| { | ||
| // Don't print a setup message on first run. | ||
| SuppressFirstTimeSetupMessage = true | ||
| }; | ||
| using (ITraceProcessor trace = TraceProcessor.Create(traceName, settings)) | ||
| { | ||
| // Specify what data we want, process the trace, then get the data. | ||
| var pendingContextSwitchData = trace.UseContextSwitchData(); | ||
| trace.Process(); | ||
| var csData = pendingContextSwitchData.Result; | ||
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|
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| long chromeSwitches = 0; | ||
| long chromeIdleSwitches = 0; | ||
| // Iterate through all context switches in the trace. | ||
| foreach (var contextSwitch in csData.ContextSwitches) | ||
| { | ||
| var imageName = contextSwitch.SwitchIn.Process.ImageName; | ||
| var oldImageName = contextSwitch.SwitchOut.Process.ImageName; | ||
| if (imageName == "chrome.exe") | ||
| { | ||
| chromeSwitches++; | ||
| if (oldImageName == "Idle") | ||
| chromeIdleSwitches++; | ||
| } | ||
| } | ||
| Console.WriteLine("{0} idlewakeups out of {1} context switches ({2:P}).", | ||
| chromeIdleSwitches, chromeSwitches, | ||
| chromeIdleSwitches / (double)chromeSwitches); | ||
| } | ||
| } | ||
| } | ||
| } |
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net6.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
|
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.Windows.EventTracing.Processing.All" Version="1.9.2" /> | ||
| </ItemGroup> | ||
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| </Project> |
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| Microsoft Visual Studio Solution File, Format Version 12.00 | ||
| # Visual Studio Version 17 | ||
| VisualStudioVersion = 17.0.31912.275 | ||
| MinimumVisualStudioVersion = 10.0.40219.1 | ||
| Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IdleWakeups", "IdleWakeups.csproj", "{B088F2D9-100B-401D-A43A-3358BF682195}" | ||
| EndProject | ||
| Global | ||
| GlobalSection(SolutionConfigurationPlatforms) = preSolution | ||
| Debug|Any CPU = Debug|Any CPU | ||
| Release|Any CPU = Release|Any CPU | ||
| EndGlobalSection | ||
| GlobalSection(ProjectConfigurationPlatforms) = postSolution | ||
| {B088F2D9-100B-401D-A43A-3358BF682195}.Debug|Any CPU.ActiveCfg = Debug|Any CPU | ||
| {B088F2D9-100B-401D-A43A-3358BF682195}.Debug|Any CPU.Build.0 = Debug|Any CPU | ||
| {B088F2D9-100B-401D-A43A-3358BF682195}.Release|Any CPU.ActiveCfg = Release|Any CPU | ||
| {B088F2D9-100B-401D-A43A-3358BF682195}.Release|Any CPU.Build.0 = Release|Any CPU | ||
| EndGlobalSection | ||
| GlobalSection(SolutionProperties) = preSolution | ||
| HideSolutionNode = FALSE | ||
| EndGlobalSection | ||
| GlobalSection(ExtensibilityGlobals) = postSolution | ||
| SolutionGuid = {1273C88D-6FDB-4224-9D13-03762DB203A5} | ||
| EndGlobalSection | ||
| EndGlobal |
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