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profiler

README.MD

dd-trace-dotnet/profiler

This folder contains the source code for the Datadog .NET APM Profiler. The .NET Profiler runs in your application process to collect managed threads call stacks related to wall time, CPU consumption, exceptions, lock contention and allocations. Read the following posts explaining implementation details:

Installation and usage

Getting started

Configure the Datadog Agent for APM as described in our documentation. To install and enable the .NET Profiler follow the steps as described in our documentation.

Development

You can develop the profiler on various environments.

Windows

Setup and minimum requirements

  • Visual Studio 2022
    • Workloads
      • Desktop development with C++
      • .NET desktop development
      • .NET Core cross-platform development
    • Individual components
      • .NET Framework 4.7 targeting pack
      • C++ for Linux Development
      • Windows 10 SDK (10.0.18362)

Building in Visual Studio

Open the solution dd-trace-dotnet\Datadog.Profiler.sln and build the projects Datadog.Profiler.Native.Windows (C++).

Building with script

Go to the Tracer folder and use the NUKE build.cmd script

..\tracer\build.cmd BuildProfilerHome BuildNativeLoader

Note: build Release binaries by default; use --buildConfiguration Debug for debug build

Debugging with Visual Studio

In the generation solution dd-trace-dotnet\Datadog.Profiler.sln, look at the C# projects under the Demos folder for specific scenarios:

  • Samples.BuggyBits: web app updated from Tess Ferrandez repository that implements anti-patterns suc has too many allocations/exceptions, memory leak or outgoing HTTP requests
  • Samples.Computer01: contains simple scenarios for end to end tests in worse case situations

In both cases, the Program.cs file contains the list of scenarios. When you want to debug a list of scenarios, OR the corresponding enumeration values and add it after "CommandLineArgs": --scenario it in the Properties\LaunchSettings.json file.

As a final step, enable the profiler you would like to debug by setting the corresponding DD_PROFILING_xxx_ENABLED=1

Note:

  • the .pprof files are generated in the folder given by the DD_INTERNAL_PROFILING_OUTPUT_DIR environment variable
  • the log files are stored in the C:\ProgramData\Datadog .NET Tracer\logs folder

Linux

Minimun requirements

To build C# projects

To build C++ projects

  • Clang >= 9.0 (recommended)
  • CMake >= 3.14
  • Libtool
  • liblzma
  • libssl-dev
  • autoconf
  • git

Building from the command line

Go to the Tracer folder and use the NUKE build.cmd script

../tracer/build.sh BuildProfilerHome BuildNativeLoader

You could also use the following to Build C++ projects and run the unit tests

CXX=clang++ CC=clang cmake -S dd-trace-dotnet -B _build
cd _build
make -j
ctest

Note: the clang compiler often finds errors that are not detected by Visual Studio