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ИЗ ПЕРВЫХ РУК: ДИАГНОСТИКА ПРИЛОЖЕНИЙ С ПОМОЩЮ ИНСТРУМЕНТОВ VISUAL STUDIO 2012 MAXIM GOLDIN Senior Developer, Microsoft

Agenda  Diagnostics in Production  Remote Debugger  IntelliTrace  Dump Debugger  Diagnostics of Client Applications  First Chance Exceptions in C++  Mixed-language  Contracts  Background tasks  Installed apps without VS project

Challenges in Production  Can’t reproduce the issue in a development environment  Can’t run Visual Studio on the production machine  Possibly very limited developer access to production machines  Want to minimize impact to the server  Performance  Availability  Security

Remote Debugger: The Big Hammer  Advantages  Often the fastest way to resolve an issue  Easy installation  Remote Tools  Xcopy deployable (%ProgramFiles%\Microsoft Visual Studio\Common7\IDE\Remote Debugger)  Configurable Authentication  Disadvantages  Your service becomes unresponsive if you are stopped in the debugger  Requires some firewall configuration

Remote Debugger TCP/IP

DEMO Remote Debugger

Improvements in Visual Studio 2012  Single Firewall Configuration (Remote Debugger Side)  Can connect across different domains  Symbols load from the Visual Studio side  No need to copy symbol files to your production machine  Faster  No need to choose between x86 and x64

IntelliTrace  A “Back-in-Time” debugger  Configurable logging to trace the state of an application through its execution history  Integrated with the Visual Studio Debugger UI for analysis  Can be run either locally or via command line

IntelliTrace Collection Plans  2 Default Levels  Events  Calls  Custom?  Can turn individual events on/off  Can include/exclude modules  Change max log file size  Requires Editing XML  lintellitrace/ lintellitrace/

IntelliTrace in Production  Download the IntelliTrace Collector   Run it on your production machine  Pick a collection plan  Target the application  Reproduce the issue  Bring the IntelliTrace log back to your development machine  Analyze in Visual Studio to find the bug

DEMO IntelliTrace In production

Impact on Server Performance  Depends on a number of factors  Number of events collected  Number of modules included in application (startup jitting costs)  Calls data collection  IO

Dump Files  Snapshots of the application at a single point in time  Two major types  With Heap – allows full inspection of the state of the app at that point in time  Without Heap – only allows for inspection of the call stacks across all threads  Can be opened directly in VS and debugged just like a regular application  Except no stepping…

Creating Dump Files in Production  Several tools available, including Visual Studio  ProcDump has many qualities that make it ideal for production use  Command line  Xcopy deployable  Provides triggers for dump collection  CPU usage, Memory usage, Exceptions (with filters)  Low impact on system performance  Available through Microsoft SysInternals: us/sysinternals/dd aspxhttp://technet.microsoft.com/en- us/sysinternals/dd aspx

DEMO ProcDump In production

Symbols (PDBs)  The debugger and IntelliTrace all need symbols to function properly  Symbols provide a mapping between the binaries you are analyzing and the source code that produced them  Also provide information for determining the local variables for a function  Symbol files must exactly match the build that you are diagnosing  It is easy for your development environment to get out of sync with what is in production

Agenda  Diagnostics in Production  Remote Debugger  IntelliTrace  Dump Debugger  Diagnostics of Client Applications  First Chance Exceptions in C++  Mixed-language  Contracts  Background tasks  Installed apps without VS project

First Chance Exception Tough to find your real error in XAML apps Turning on first chance exceptions can create a lot of noise that can slow you down Async patterns can make this worse

DEMO FIRST CHANCE EXCEPTION

First Chance Exception Stop on Originate Error Exceptions for C++ Use the memory window on the third parameter to decode the secret message

Native/Managed Debugging for Store Apps  Remote Debugging  Native Visualization  Reliable Stepping  Shipped in Update 1

Mixed-language I have options for “Native Only” and “Script Only” debugging. What if I want to do both?

DEMO DEBUGGING NATIVE AND JAVASCRIPT

Debugging Native and JavaScript  No Mixed Mode Debugging Support  Use Multiple VS Instances Instead  Launch the app under the script debugger  Attach with the native debugger from a second instance of VS  Visual Studio naturally gives focus to the correct instance  Cannot Debug JavaScript when stopped in the native debugger

Contract Debugging  Windows 8 contracts provide a new entry point for applications  It’s not the same code as just launching under the debugger  Simply attaching is not quick enough as you may have missed the code that you wanted to debug

DEMO CONTRACT DEBUGGING

Contract Debugging  Configure the app to debug without launch in the project properties  F5 the app  Invoke your application manually through the contract

Background Tasks  Your app can register to run background tasks when certain events happen  Some background tasks are straight forward to test and debug because you can trigger them manually  Others can be a much bigger pain  Like a maintenance trigger that fires after 8 hours

DEMO BACKGROUND TASK DEBUGGING

Background Tasks  Trigger background tasks from the Debug Location Toolbar  Can trigger tasks on apps that are not running  Set them to debug without launching first  Can trigger tasks that do not require a payload

No Projects  There are several reasons why you may not have a VS project, but still want to debug  Permissions  Convenience  Normally build/deploy outside of VS  Attach to process is a pain for WWAs  Especially if you need to debug startup code!

DEMO NO PROJECT DEBUGGING

No Projects  Use the “Debug Installed App Package Feature”  Works both local and remote  Can automatically stop at the first line of JavaScript Code

Agenda  Diagnostics in Production  Remote Debugger  IntelliTrace  Dump Debugger  Diagnostics of Client Applications  First Chance Exceptions in C++  Mixed-language  Contracts  Background tasks  Installed apps without VS project

More Info, Request Features Maxim Goldin : ALM Team Blog: Uservoice site:

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