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ИЗ ПЕРВЫХ РУК:
ДИАГНОСТИКА ПРИЛОЖЕНИЙ
С ПОМОЩЮ ИНСТРУМЕНТОВ
VISUAL STUDIO 2012
MAXIM GOLDIN
Senior Developer, Microsoft
Agenda
 Diagnostics in Production
 Diagnostics of Client Applications
 Remote Debugger
 First Chance Exceptions in C++
 IntelliTrace
 Mixed-language
 Dump Debugger
 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
 http://blog.qetza.net/en/2010/03/08/vs-2010-personnalisation-des-vnements-delintellitrace/
IntelliTrace in Production
 Download the IntelliTrace Collector
 http://www.microsoft.com/en-us/download/details.aspx?id=30665
 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: http://technet.microsoft.com/enus/sysinternals/dd996900.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
 Diagnostics of Client Applications
 Remote Debugger
 First Chance Exceptions in C++
 IntelliTrace
 Mixed-language
 Dump Debugger
 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
 Diagnostics of Client Applications
 Remote Debugger
 First Chance Exceptions in C++
 IntelliTrace
 Mixed-language
 Dump Debugger
 Contracts
 Background tasks
 Installed apps without VS project
More Info, Request Features
Maxim Goldin : mgoldin@microsoft.com
ALM Team Blog: http://blogs.msdn.com/b/visualstudioalm
Uservoice site: http://visualstudio.uservoice.com
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