The document provides an overview of .NET profilers, detailing their functionalities, use cases, and a comparison of commercial and open-source options. It covers technical aspects such as the profiler API, IL rewriting, and memory management, complemented by code examples and demos. Additionally, it includes a brief history of .NET runtime profiling and necessary setup instructions for various .NET versions.

1. .NET Profilers aren’t scaryshaun.wilde@commonvision.com.aushaun_wilde@hotmail.com@scubamunkiEmail:Email:Twitter:

2. Who am I?Specialize in providing project teams with the necessary frameworks and personnel during the critical early stages of the project.shaun.wilde@commonvision.com.aushaun_wilde@hotmail.com@scubamunkiEmail:Email:Twitter:

3. CoverageEye.NETOriginally hosted on GotDotNetPartCoverOriginally hosted on SourceForgeForked to GitHubhttps://github.com/sawilde/partcover.net4OpenCoverHosted on GitHubhttps://github.com/sawilde/opencoverHow did I get here?

4. Profilers: What are they good for?Quick review of some commercial and open source .NET profilersOverview of the profiler APICode and DemosBasics of IL rewritingCode and Demos IIIntroducing new classes and methodsCode and Demos IIIExtras (If time permits).NET Profilers aren’t (that) scary

5. Profilers: What are they good for?

6. Monitor Load/Unload EventsApplication DomainsAssembliesModulesClassesJIT Compilation EventsMonitor threads, remotingand native/managed transitionsMonitor GC eventsMonitor exceptionsMonitor method enter/leaveMonitor the runtime

7. Get the names and signatures of classes and methodsRead the IL for methods (functions)Memory allocationsTypesGarbage CollectionCall graphsInterrogate the runtime

8. Dynamically create new classes and methodsRewrite the IL of existing methodsAllocate memoryWork with the GCInteract with the runtime

9. CommercialRedgate ANTSNCover(was originally Open Source)JetBrainsdotCover/dotTraceCLRProfiler4 (Microsoft with Source Code)Commercial and Open Source Profilers*(*Obviously this list is not complete)

10. Open SourceNprofhttp://code.google.com/p/nprof/SlimTunehttp://code.google.com/p/slimtune/PartCoverhttps://github.com/sawilde/partcover.net4OpenCoverhttps://github.com/sawilde/opencoverCommercial and Open Source Profilers*(*Obviously this list is not complete)

11. System.Reflection.Emit.NET FrameworkMono.Cecilhttps://github.com/mono/cecilOther IL (Re)Writing Methods

12. Important InterfacesImplementation and RegistrationOverview of the Profiler API

13. In-process COM objecti.e. a DLLNative codei.e. unmanaged codeFree threadedi.e. the developer is responsible for any required synchronisation 32/64 bitLike for likeImplementation

15. .NET Runtime through the ages

16. ICorProfilerCallback69 MethodsICorProfilerInfo33 MethodsIMetaDataImport64 MethodsIMetaDataEmit49 Methods.NET1

17. ICorProfilerCallback28 MethodsICorProfilerInfo221 MethodsIMetaDataImport264 MethodsIMetaDataEmit249 Methods.NET2

18. ICorProfilerCallback33 MethodsICorProfilerInfo314 Methods.NET4

19. How much?

20. Register the COM ObjectUse Environment variablesc:>set COR_ENABLE_PROFILING=1c:>set COR_PROFILER=MyProfiler.ProfilerInstantiation

21. NET4 profilers can be used to profile .NET2 assemblies

22. Need to be side-by-side CLR awarePick onePick firstPick all/manyRunSxShttp://archive.msdn.microsoft.com/RunSxS.NET4

23. Silverlight supportCORECLR_ENABLE_PROFILINGCORECLR_PROFILERCORECLR_PROFILER_PATH.NET4

24. Creating an ATL COM object with required interfacesDemo 1

30. Create host and target processesLaunch Target with ProfilerSimple TargetDemo 2

37. Requesting and handling eventsICorProfilerInfo::SetEventMaskCOR_PRF_MONITOR_MODULE_LOADSCOR_PRF_MONITOR_JIT_COMPILATIONCOR_PRF_DISABLE_INLININGCOR_PRF_DISABLE_OPTIMIZATIONSDemo 3

42. Getting assembly and method namesInterfacesICorProfilerInfo3IMetaDataImport2Demo 4

50. What is a Method?HeadersSectionsClausesThe Method BodyOperationsBranchesThe StackDebug vs. ReleaseBasics of IL Rewriting

51. Tiny and Fat Methods

54. Tiny and Fat Sections

56. Tiny and Fat Clauses

58. 5 Types of ClausesCOR_ILEXCEPTION_CLAUSE_NONECOR_ILEXCEPTION_CLAUSE_FILTERCOR_ILEXCEPTION_CLAUSE_FINALLYCOR_ILEXCEPTION_CLAUSE_FAULTCOR_ILEXCEPTION_CLAUSE_DUPLICATEDClauses

59. Try/CatchCode in handler block is called if an exception of the type expected is thrown from code that is contained in the try block. (needs rewording)COR_ILEXCEPTION_CLAUSE_NONE

60. Variation on Try/CatchVB.NET onlyCOR_ILEXCEPTION_CLAUSE_FILTER

61. Try/FinallyCode in handler block always called regardless of how the associated try block is exited.COR_ILEXCEPTION_CLAUSE_FINALLY

62. Try/FaultCode in handler block is only called if an exception has occurred in the corresponding try block.The exception continues on…IL Only?COR_ILEXCEPTION_CLAUSE_FAULT

63. A Mystery// duplicated clause.. this clause was duplicated down to a funclet which was pulled out of lineCOR_ILEXCEPTION_CLAUSE_DUPLICATED

65. The Method BodyOperationsBranchesThe StackDebug vs. ReleaseThe Method Body

66. Contains all the information needed to interpret and write ILCanonical NameString NameStack BehaviourParameter SizeLengthBytesControl FlowOPCODE.DEF

69. OPCODE.DEF

70. OPCODE.DEF

71. Is there a difference?Debug vs. Release

74. HeadersStack sizeMethod SizeClausesOffsetsLengthsBranchesSize of JumpConsiderations when adding IL

75. Make …Tiny headers FatTiny sections FatTiny clauses FatShort branches Long Cheat…Use the parser from OpenCoverCommon approach when adding IL

76. Leverage the OpenCover parserDemo 5

83. Add a new TypeExceptionDefine Constructor (.ctor)Throw new TypeAdd extra IL to TargetMethodAdding new classes and methods I

84. InterfacesIMetaDataEmit2IMetaDataAssemblyEmitAdding New Classes and Methods

88. IL DASM

97. ComplicatedIntensiveHmmmm……

104. Sequence PointsPDB FilesIL RewritingPoints out of syncDebugging

108. The EndDemo codehttps://github.com/sawilde/DDD2011_ProfilerDemo