Introduction With the new 2.10 release of the Datadog .NET Tracer and Continuous Profiler available, it is time to update some investigation workflows I already introduced. New features have been added to help you diagnose performance issues in your .NET applications: Linux support! Code Hotspots: allow you to automatically navigate from…

Here comes the end of the series about .NET profiling APIs. This final episode describes how to get fields of a value type instance and how to deal with exceptions. Getting fields of a value type instance The case of a value type is very similar to a reference type except that the address you receive points…

Introduction The beta of Datadog .NET Continuous Profiler is available! This is a great opportunity to show how to use the different tools provided by Datadog to troubleshoot .NET applications facing performance issues. Tess Ferrandez updated her famous BuggyBits application to .NET Core. Among the different available scenarios, let’s see how…

Introduction After getting basic and strings parameters, it is time to look at arrays and reference types. Accessing managed arrays You check against null array parameter the same way as for string: The ELEMENT_TYPE_SZARRAY applies to single dimension arrays including jagged arrays. ELEMENT_TYPE_ARRAY is used for matrice : Since arrays are reference…

Introduction From the list of arguments with their type, it becomes possible to figure out their value when a method gets called. The rest of this post describes how to access method call parameters and get the value of numbers and strings. Where are my parameters? When you pass COR_PRF_ENABLE_FUNCTION_ARGS to ICorProfilerInfo::SetEventMask, the runtime prepares…

Introduction After introducing the CLR profiling API by tracing managed methods calls, then dealing with assemblies and types, it is time to look at methods signatures. Remember that the starting point is the FunctionID received by the Enter callback each time a method is executed. The question answered by this post…

Introduction In the first post of this series dedicated to CLR Profiling API, you have seen how to get a FunctionID each time a managed method is executed in a .NET application. As David Broman (source of most of the profiling implementation details at Microsoft) explains, a FunctionID is a pointer…

Introduction When I want to dig into a new API, I implement a real world scenario. This is exactly what I did for the .NET native profiling API. I want to know how to get parameters and return value of any method call during any .NET application life. …

I have already explained how to write your own allocation monitoring tool. Each time 100 cumulated KB are allocated, the CLR emits an AllocationTick event with the name of the last allocated type before the 100 KB threshold and if it is in the LOH or not. …