What′s New in dotTrace

• Now, you can profile .NET Core applications on macOS and Linux using the Tracing profiling mode. To do this, you should use either JetBrains Rider or dotTrace command-line profiler.
• Now, you can attach the profiler to running processes on Linux.

Now, you can navigate through Call Tree using the Next Important Call action. Press Ctrl+Shift+Right and dotTrace will navigate you to a node that is most relevant for further analysis (for example, a node with high own execution time).

The feature is available in dotTrace Standalone (both Performance Viewer and Timeline Viewer), in Visual Studio, and JetBrains Rider.

dotTrace 2019.3 supports sampling profiling of .NET Core projects on Linux and macOS. Note that only projects targeting .NET Core 3.1 are fully supported. Because of some .NET Core limitations, profiling of projects targeting .NET Core 3.0 or earlier may have some issues: in rare cases, the profiled application may hang or crash.

To profile .NET Core applications on Linux and macOS, you should use JetBrains Rider or dotTrace command-line tools.

• dotTrace is able to attach to .NET Core 3.0 Preview 7 processes.
• ASP.NET Core 3.0 Preview 7 is supported.

• You can set environment variables for any application type.
• ASP.NET Core support in Visual Studio is improved: different hosting models are correctly supported, browser settings and Enable SSL are taken into account when starting a profiling session, and more.
• Profiling API gets the ability to detach from the profiled process.
• Silverlight and WebDev applications are no longer supported.

As you might know, dotTrace includes the profiling API that is used to control profiling sessions right from the code of your application. In 2019.1, we have rewritten this API from scratch to make it more user-friendly:

• We got rid of the state machine.
• We reduced a number of methods you have to use. Thus, to start profiling, simply call MeasureProfiler.StartCollectingData(). To stop collecting data and save a snapshot, call MeasureProfiler.SaveData().
• The API is available as a NuGet package.

The dotTrace command-line profiling tools get improved:

• The start and attach commands now accept advanced profiling parameters, like time measurement type and others.
• The Reporter.exe tool accepts the --save-signature argument that allows you to distinguish overloaded methods in the final report.