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randomasciirandomascii
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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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5 files changed

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‎.gitignore‎

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*.svg
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*.pdb
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*.user
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*.launchSettings.json
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# New Visual Studio 2015 intellisense DB files
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# http://blogs.msdn.com/b/vcblog/archive/2015/11/11/new-improved-and-faster-database-engine.aspx
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*.VC.db
@@ -41,6 +42,9 @@ etwpackage*.zip
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etwsymbols*.zip
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sourceindex.txt
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# Avoid shipping nuget files and others in /obj/ directories.
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obj/
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Debug/
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Release/
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*DoNotShip/

‎TraceProcessors/IdleWakeups/IdleWakeups.cs‎

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/*
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Copyright 2021 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Detect idle wakeups in Chrome in an ETW using TraceProcessing
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// Explanations of the techniques can be found here:
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// 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
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// drive this:
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// https://blogs.windows.com/windowsdeveloper/2019/05/09/announcing-traceprocessor-preview-0-1-0/
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// Note that this URL has changed once already, so caveat blog lector
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using Microsoft.Windows.EventTracing;
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class IdleWakeups
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{
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static void Main(string[] args)
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{
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foreach (string traceName in args)
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{
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Console.WriteLine("Processing trace '{0}'", traceName);
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var settings = new TraceProcessorSettings
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{
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// Don't print a setup message on first run.
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SuppressFirstTimeSetupMessage = true
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};
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using (ITraceProcessor trace = TraceProcessor.Create(traceName, settings))
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{
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// Specify what data we want, process the trace, then get the data.
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var pendingContextSwitchData = trace.UseContextSwitchData();
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trace.Process();
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var csData = pendingContextSwitchData.Result;
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long chromeSwitches = 0;
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long chromeIdleSwitches = 0;
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// Iterate through all context switches in the trace.
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foreach (var contextSwitch in csData.ContextSwitches)
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{
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var imageName = contextSwitch.SwitchIn.Process.ImageName;
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var oldImageName = contextSwitch.SwitchOut.Process.ImageName;
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if (imageName == "chrome.exe")
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{
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chromeSwitches++;
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if (oldImageName == "Idle")
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chromeIdleSwitches++;
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}
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}
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Console.WriteLine("{0} idlewakeups out of {1} context switches ({2:P}).",
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chromeIdleSwitches, chromeSwitches,
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chromeIdleSwitches / (double)chromeSwitches);
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}
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}
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}
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}

‎TraceProcessors/IdleWakeups/IdleWakeups.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.Windows.EventTracing.Processing.All" Version="1.9.2" />
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</ItemGroup>
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</Project>

‎TraceProcessors/IdleWakeups/IdleWakeups.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.0.31912.275
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IdleWakeups", "IdleWakeups.csproj", "{B088F2D9-100B-401D-A43A-3358BF682195}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{B088F2D9-100B-401D-A43A-3358BF682195}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{B088F2D9-100B-401D-A43A-3358BF682195}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{B088F2D9-100B-401D-A43A-3358BF682195}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{B088F2D9-100B-401D-A43A-3358BF682195}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {1273C88D-6FDB-4224-9D13-03762DB203A5}
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EndGlobalSection
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EndGlobal

‎TraceProcessors/TraceProcessors.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 16
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VisualStudioVersion = 16.0.28803.202
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# Visual Studio Version 17
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VisualStudioVersion = 17.0.31919.166
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IdentifyChromeProcesses", "IdentifyChromeProcesses\IdentifyChromeProcesses.csproj", "{42AC0C9A-BBE7-4C8E-BB00-84D9C9FC8EE3}"
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EndProject
@@ -11,6 +11,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HeapSnapshotCompare", "Heap
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VideoConfCPUCounters", "VideoConfCPUCounters\VideoConfCPUCounters.csproj", "{C37B7893-D2B9-4DA1-835C-04339B38BFF7}"
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EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "IdleWakeups", "IdleWakeups\IdleWakeups.csproj", "{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{C37B7893-D2B9-4DA1-835C-04339B38BFF7}.Release|x64.Build.0 = Release|Any CPU
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{C37B7893-D2B9-4DA1-835C-04339B38BFF7}.Release|x86.ActiveCfg = Release|Any CPU
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{C37B7893-D2B9-4DA1-835C-04339B38BFF7}.Release|x86.Build.0 = Release|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Debug|x64.ActiveCfg = Debug|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Debug|x64.Build.0 = Debug|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Debug|x86.ActiveCfg = Debug|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Debug|x86.Build.0 = Debug|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Release|Any CPU.Build.0 = Release|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Release|x64.ActiveCfg = Release|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Release|x64.Build.0 = Release|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Release|x86.ActiveCfg = Release|Any CPU
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{3CD706EF-50E6-46EF-BF11-3AFB86C57E10}.Release|x86.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE

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