Writing a .NET Core cross platform profiler in an hour
summary
Demonstrates a working native C++ .NET Core profiler that builds from one codebase for Windows and Linux using MSBuild shared items and clang on WSL, exports DllGetClassObject, implements ICorProfilerCallback and uses std::atomic for COM-style ref counting; loader is activated by CORECLR_ENABLE_PROFILING=1 plus CORECLR_PROFILER and CORECLR_PROFILER_PATH. The demo logs assembly loads, JIT start/stop, GC events and thread creation to files, instruments via JIT IL hooks, and runs successfully against a Mandelbrot GUI, a primes console app and an ASP.NET Kestrel site.
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chapters (18)
- 0:00Introduction to profiling
- 1:52What is a .NET profiler
- 4:00How profiling works in .NET Core
- 6:50Steps to load a profiler
- 10:07COM and the Platform Adaptation Layer
- 14:43Building for Windows and Linux
- 19:44Environment variables setup
- 20:45Code walkthrough: DLL entry points
- 24:17Project properties and compiler settings
- 27:07Common code and abstractions
- 29:15Demo: Profiling on Windows
- 34:36Demo: Profiling on Linux with WSL
- 39:56Core profiler class implementation
- 46:18Initialize method and event handling
- 51:57Challenges in cross-platform code
- 57:33Advanced profiling techniques
- 57:56Summary and future of profiling
- 59:41Q&A and resources
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