If it's NDIS.sys, for instance, that's a network interface driver. If you look at the module listed under Start Address, it should give you a clue as to what the work is related to. The thread that's causing all this kernel mode work should be here. Right click the System "process" and go to Properties. Make sure you are running with full UAC elevation. If the process with the highest Privileged Processor Time is System, which I suspect it is, then it's a little more complicated. If that process is not "System," then you've just figured out what user mode process is causing this CPU usage. The process at the top of the list is the process currently using the most kernel mode CPU time right now. Sort-Object PrivilegedProcessorTime -Descending Running Powershell as administrator, type: Get-Process | Select Name, PrivilegedProcessorTime | ` From time to time, functions are added or updated.As others have already pointed out, we can see from that screenshot that the CPU that's working so hard is spending all its time in kernel mode. This API enables capturing kernel stack traces, merging multiple trace files for analysis, and including system information in the merged files. No public API is available for the current version of WPA. However, it is obsolete, and new profiles should be created using the current version. This API is an extension of the ETA Event Tracing API and is supported for backward compatibility with existing scripts and profiles. The Kernel Trace Control API Reference covers the Kernel Trace Control API available in previous versions of WPA. See wpr -help start for more information.Īfter recording a trace, you can now immediately open it in WPA by choosing the Open in WPA button.ĭirect handling of CLR symbols, so no flags are necessary when configuring and using NGEN support Start command now supports shutdown tracing to persist over reboot. See wpr -help profiles for more information. When saving a ETL, Ctrl + C can be used to cancel a in progress save.Įxport profile command enables exporting of built-in profiles to be used as a starting point for building a custom Windows Performance Recorder Profile (*.wprp). Merge command enables merging of ETL traces (similar to XPerf's merge command). New for Windows Server 2022 The WPR command line has gotten a few new features and updates to improve your developer analysis: Windows Performance Recorder (WPR) is a performance tool that you can use to record system events that you can then analyze by using WPA. Support for multiple traces in a single session Stack tags for creating labels that help you better identify which parts of the call stack(s) are affected Regions of Interest that allow you to highlight important time ranges in a trace Point in time rectangle viewer that allows you to visualize what happened on the screen during your trace New version of the File menu (called Rich Menu) with the option to switch back to the Classic Menu Rich text support for the Analysis Assistant that lets you format your text to make it easier to read and parse, as well as add links to reference materials, videos, or more detailed help pages on the web. When using the assessment console, make sure to select the assessment file.Īnalysis Assistant pane that displays helpful content to help you determine how to best use a given graph, preset, or analysis tab.URI (wpa://) only works for assessments files. These columns can be manually added via the View Editor. Regions Table not auto adding field columns. Symbols Load progress can appear to be hung or stuck, but symbols will continue to load. To work around the issue, load symbols first before interacting with tables. Symbols Columns can become stale when Symbols are being loaded: Since most of the code has been rewritten from the ground up, here are a few known issues: NET Core 3.1 application, allowing for extensibility by loading plugins to process any specific data sources (outside of ETL). With the rewrite, WPA is now a self contained. New for Windows Server 2022 WPA's code structure and tooling has been rewritten with early support of the Performance Toolkit SDK. Windows Performance Analyzer (WPA) visualizes traces from Windows Performance Recorder and Windows Assessment Console as graphs and tables to allow you to analyze system and application performance. To ensure proper installation, run setup.exe instead of trying to install the packaged MSI. The Windows Performance Toolkit installation is split into multiple MSI.
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