What′s New in dotTrace

We’ve completely reworked the dotTrace Home screen. It’s much easier to configure and start new profiling sessions, work with snapshots, and perform other basic operations.

You can install and use the dotTrace command-line profiler as a dotnet global tool: dotnet tool install --global JetBrains.dotTrace.GlobalTools --version 2021.1.0

In Rider, you can switch the call tree to the flame graph mode. The graph helps you quickly identify the slowest methods in the current scope.

dotTrace for Rider gets the call tree folding feature (earlier it was available only in the standalone version of dotTrace). It helps simplify call tree analysis by folding chains of calls that do not belong to user modules and assemblies.

• You can hide native threads in the Threads list in Rider.
• The File I/O timeline filter now includes the FileIOCreate events.
• You can hide the Top Methods list in Rider.
• Multiple bugfixes.

Both standalone dotTrace and dotTrace in Rider can profile the native part of Mono/Unity applications on Windows. Start a session with the ‘Enable native profiling’ option selected, and you’ll see both native and managed call stacks in the performance snapshots.

The dotTrace command-line profiler for Linux (any distribution with GLIBC_2.23 or later) lets you profile applications on ARM64 systems.

• The profiler lets you control the profiling session (take snapshots, detach from the profiled process, and so on) by sending commands to stdin or a file.
• The new self-profiling API (the API that lets applications initialize and start a profiling session by themselves) is much easier to use. The self-profiling API is distributed as a NuGet package.

• 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.