Troubleshooting%20Web%20Site%20Performance%20Issues%20with%20Visual%20Studio%20Team%20System

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Troubleshooting Web Site Performance Issues with
Visual Studio Team System

• Martin Kulov
• Director .NET Development
• National Academy for Software Development
• MVP VSTS, MCT, MCSD, MCPD

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What We Will Cover

• How testing processes can help us deliver quality
  code
• Measuring performance of ASP.NET sites
• Improving ASP.NET performance

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Session Prerequisites

• .NET Framework intermediate level
• ASP.NET intermediate level
• Windows Counters basic level

Level 200
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Agenda

• WWW (Why, When, What) to test
• Web Applications Tests
• Performance Testing ASP.NET applications
• Profiling ASP.NET Applications
• Measuring ASP.NET Applications
• Tuning ASP.NET Applications

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Why we should test

• Quality increase
• Finding and fixing design problems
• Lowering TCO and maintenance costs

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When we should test

• As often as possible
• As early as possible
• Test automation would help a lot

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What we should test

• Critical business features
• Everything else ?
• The clearer performance goals are, the better we
  will know what to test
• PMs should get these goals defined from the start

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Testing Web ApplicationsTesting types

• Functional Testing
• Performance Testing
• Security Testing
• Reliability Testing
• Usability Testing
• others

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Performance Testing

• Most critical and often neglected type of test
• It should be done during each phase of the
  project
• There are three main principles
• Measure
• Measure
• Measure
• Set your desired goals
• Tune the application

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Setting your goals

• Response time
• Latency on the server
• Latency on the client (TTFB and TTLB)
• Throughput
• Resource utilization
• Identify problem areas
• Define workload profiles

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Profiling ASP.NET Applications

• Profiling is the process of collecting data
• We can measure the result
• Profiling is done though code instrumentation
• In instrumentation we inject additional code to
  the system so it can generate events

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System Resources CountersCPU Counters

• Processor\ Processor Time
• Processor\ Privileged Time
• Processor\ Interrupt Time
• System\Processor Queue Length
• System\Context Switches/sec

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System Resources CountersMemory Counters

• Memory\Available Mbytes
• Memory\Page Reads/sec
• Memory\Pages/sec
• Memory\Pool Nonpaged Bytes
• Server\Pool Nonpaged Failures
• Server\Pool Paged Failures
• Server\Pool Nonpaged Peak
• Memory\Cache Bytes
• Memory\Cache Faults/sec

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System Resources CountersNetwork Counters

• Network Interface\Bytes Total/sec
• Network Interface\Bytes Received/sec
• Network Interface\Bytes Sent/sec
• Server\Bytes Total/sec
• Protocol_Object\Segments Received/sec
• Protocol_Object\Segments Sent/sec
• Processor\ Interrupt Time

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System Resources CountersDisk I/O Counters

• PhysicalDisk\Avg. Disk Queue Length
• PhysicalDisk\Avg. Disk Read Queue Length
• PhysicalDisk\Avg. Disk Write Queue Length
• PhysicalDisk\Avg. Disk sec/Read
• PhysicalDisk\Avg. Disk sec/Transfer
• PhysicalDisk\Disk Writes/sec

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Managed Code CountersMemory Counters

• Process\Private Bytes
• .NET CLR Memory\ Time in GC
• .NET CLR Memory\ Bytes in all Heaps
• .NET CLR Memory\ Gen N Collections
• .NET CLR Memory\ of Pinned Objects
• .NET CLR Memory\Large Object Heap Size

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Managed Code CountersOther Counters

• Working Set
• Process\Working Set
• Exceptions
• .NET CLR Exceptions\ of Exceps Thrown / sec
• Contention
• .NET CLR LocksAndThreads\Contention Rate/sec
• .NET CLR LocksAndThreads\Current Queue Length

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Managed Code CountersOther Counters

• Threading
• .NET CLR LocksAndThreads\ of current physical
  Threads
• Thread\ Processor Time
• Thread\Context Switches/sec
• Thread\Thread State
• Code Access Security
• .NET CLR Security\Total RunTime Checks
• .NET CLR Security\Stack Walk Depth

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ASP.NET Counters

• Worker Process
• ASP.NET\Worker Process Restarts
• Throughput
• ASP.NET Applications\Requests/Sec
• Web Service\ISAPI Extension Requests/sec
• ASP.NET\Requests Current
• ASP.NET Applications\Requests Executing
• ASP.NET Applications\Requests Timed Out
• Response time / latency
• ASP.NET\ Request Execution Time

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ASP.NET Counters

• Cache
• ASP.NET Applications\Cache Total Entries
• ASP.NET Applications\Cache Total Hit Ratio
• ASP.NET Applications\Cache Total Turnover Rate
• ASP.NET Applications\Cache API Hit Ratio
• ASP.NET Applications\Cache API Turnover Rate
• ASP.NET Applications\Output Cache Entries
• ASP.NET Applications\Output Cache Hit Ratio
• ASP.NET Applications\Output Cache Turnover Rate

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Tuning ASP.NET ApplicationsTuning Process

• Performance tuning is an iterative process
• On every step we should identify and eliminate
  bottlenecks
• Retest and measure again to see if we are closer
  to our performance goals

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Tuning ASP.NET ApplicationsTuning Categories

• Application
• Configuration settings
• web.config
• Platform
• .NET Framework
• Web Server
• OS
• Database
• System
• CPU, Memory, I/O, etc

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Tuning ASP.NET ApplicationsTune the thread pool

• ltprocessModelgt

ltprocessModel enable"true" timeout"Infinite
idleTimeout"Infinite shutdownTimeout"00005"
requestLimit"Infinite" requestQueueLimit"5000"
restartQueueLimit"10 memoryLimit"60
webGarden"false" cpuMask"0xffffffff"
userName"machine password"AutoGenerate"
logLevel"Errors clientConnectedCheck"00005
comAuthenticationLevel"Connect
comImpersonationLevel"Impersonate responseDea
dlockInterval"000300" maxWorkerThreads"20
maxIoThreads"20"/gt
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Tuning ASP.NET ApplicationsTune the thread pool

• lthttpRuntimegt

lthttpRuntime executionTimeout"90"
maxRequestLength"4096 useFullyQualifiedRedirect
Url"false" minFreeThreads"8" minLocalRequestF
reeThreads"4" appRequestQueueLimit"100" enabl
eVersionHeader"true"/gt
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Tuning ASP.NET ApplicationsRecommended settings

• Recommended Threading Settings for Reducing
  Contention

Configuration setting Default (.NET 1.1) Recommended value
maxconnection 2 12 CPUs
maxIoThreads 20 100
maxWorkerThreads 20 100
minFreeThreads 8 88 CPUs
minLocalRequestFree-Threads 4 76 CPUs
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Tuning ASP.NET ApplicationsOther settings

• Set memory limit
• ltprocessModel ... memoryLimit"60" .../gt
• IIS 6.0 manager
• Set timeouts
• lthttpRuntime executionTimeout"90" /gt
• ltprocessModel responseDeadlockInterval"000300"
  /gt
• Evaluate use of RequestQueueLimit
• ltprocessModel enable"true" requestQueueLimit"500
  0" /gt

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Tuning ASP.NET ApplicationsOther settings

• Disable tracing and debugging
• Disable session state
• ltsessionState mode"off" /gt
• ltsessionState timeout"20"/gt
• Disable View State
• ltpages enabledViewState"false" /gt

ltconfigurationgt ltsystem.webgt lttrace
enabled"false" pageOutput"false"
/gt ltcompilation debug"false"
/gt lt/system.webgt lt/configurationgt
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Demonstration 1

• Profiling and load testing ASP.NET applications
  with Visual Studio Team System 2005 for Software
  Testers

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Session Summary

• The inevitable software testing process
• Measuring performance of ASP.NET applications
• Tuning performance of ASP.NET applications
• Visual Studio Team System 2005 for Software
  Testing provide integrated profiling, load
  testing and reporting environment

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Next Steps

• Create load profiles for your application
• Prepare and analyze reports from load testing
• Identify and resolve bottlenecks
• Tune Windows OS performance
• Tune ADO.NET performance
• Tune SQL Server performance

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For More Information

• Microsoft patterns practices
• http//msdn.microsoft.com/practices/
• Improving .NET Application Performance and
  Scalability
• http//msdn.microsoft.com/library/default.asp?url
  /library/en-us/dnpag/html/scalenet.asp

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Additional Resources

• Rico Marianis blog
• http//blogs.msdn.com/ricom/
• Maoni's WebLog
• http//blogs.msdn.com/maoni/
• Bulgarian Association of Software Developers
• http//www.devbg.org
• http//academy.devbg.org
• Martin Kulovs blog
• http//www.codeattest.com/blogs/martin

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Questions and Answers

• Submit text questions using the Ask button.
• Dont forget to fill out the survey.
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