Everything except helloworld!wmain - 21%.Here’s the data from the flamegraph summarised as text, with links the corresponding functions in the ‘.NET Core Runtime’ source code: NET Runtime Startupįinally, we can answer our original question: Perf & flamegraphs /duzWs2hoLT- 🔎Julia Evans🔍 DecemAnaylsis of. Note: If you’ve never encountered ‘ flamegraphs’ before, I really recommend reading this excellent explanation by Julia Evans: Once that’s done you can ‘browse’ that file at speedscope.app, or if you want you can just take a look at one I’ve already created. To do this click File -> Save View As and then in the ‘Save as type’ box select Speed Scope Format. Now, at this point I actually recommend exporting the PerfView data into a format that can be loaded into as it gives you a much better experience. Change ‘ Fold%’ to a higher number, maybe 3%, to get rid of any thin bars (any higher and you start to loose information).Change ‘ GroupPats’ to one of the following for a better flame graph:.Now the ‘CPU Stacks’ view should look something like this: Right-click and select ‘ Lookup Symbols’ (or just hit ‘Alt+S’).In the ‘ By name’ tab, hit ‘Ctrl+A’ to select all the rows.Optional, change the ‘ Symbol Path’ from the default to something else.In the ‘ GroupPats’ drop-down, select ‘’.In the list, select the ‘ HelloWorld’ process (PerfView collects data machine-wide).Notice there’s alot of ‘?’ characters in the list, this means that PerfView is not able to work out the method names as it hasn’t resolved the necessary symbols for the Runtime dlls. Now, select ‘CPU Stacks’ and you’ll be presented with a view like this: Once you have your ‘.etl.zip’ file, double-click on it and you will see a tree-view with all the available data. Once the process is complete you should see the newly created file in the left-hand pane of the main UI, in this case it’s called ‘’ Data Processing If you then inspect the log you can see that it’s collecting data, obtaining symbols and then finally writing everything out to a. Set ‘ Max Collect Sec’ to 15 seconds (because our ‘HelloWorld’ app never exits, we need to ensure PerfView stops collecting data at some point).Tick ‘ Cpu Samples’ if it isn’t already selected.Click ‘Run a command’ or (Alt-R’) and “collect data while the command is running”.
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Download and run a recent version of ‘PerfView.exe’.PerfView is a very powerful program, but not the most user-friendly of tools, so I’ve put togerther a step-by-step guide: The Console.ReadLine() call is added because I want to ensure the process doesn’t exit whilst PerfView is still collecting data. NET Runtime is doing during program start-up, so I ensure the minimum amount of user code is runing, hence the following ‘Hello World’: using System Code Sampleįor this exercise I delibrately only look at what the. This post is a step-by-step guide to that demo. NET Runtime is spending it’s time during start-up: From 'dotnet run' to 'hello world' from Matt Warren In the talk I demonstrate how you can use PerfView to analyse where the. Recently I gave a talk at the NYAN Conference called ‘From ‘dotnet run’ to ‘hello world’:
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