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ASP.NET Scalability - VBUG London

This document discusses techniques for writing scalable ASP.NET applications, including caching output, objects, and data; managing paging; reducing network loads by optimizing viewstate and using compression; and distributed caching options like Velocity, NCache, and memcached. It provides an overview of these techniques and resources for further information.

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“This One Goes Up To 11”
                              or
         How to write scalable ASP.NET

Phil Pursglove
phil@philippursglove.com
http://diaryofadotnetdeveloper.blogspot.com
http://www.philippursglove.com/ScalableASPNET
http://twitter.com/philpursglove
About Me
•   Senior .NET Developer
•   MBCS
•   MCSD
•   VBUG East Anglia Co-ordinator
•   Written for VB Developer and SQL
    Server Pro
Agenda
• Increasing server performance
  – Caching
    •   Output caching
    •   Donut caching
    •   Object caching
    •   Velocity
  – Paging
• Reducing network loads
  – Managing ViewState
  – Compression
What is Scalability?
• “The ability to handle growing amounts of
  work in a graceful manner” Wikipedia

• Scalability != Performance

• What affects scalability?

• Everything you see today applies to .NET
  2.0 and higher
Increasing Server
  Performance
Why Cache?
• Because there’s a credit crunch!
• Building a page is an expensive
  process
  – Database calls across servers
  – Web Service calls
  – AD lookups

• Returning a stored page from a cache
  is much cheaper!

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ASP.NET Scalability - VBUG London

  • 1. “This One Goes Up To 11” or How to write scalable ASP.NET Phil Pursglove phil@philippursglove.com http://diaryofadotnetdeveloper.blogspot.com http://www.philippursglove.com/ScalableASPNET http://twitter.com/philpursglove
  • 2. About Me • Senior .NET Developer • MBCS • MCSD • VBUG East Anglia Co-ordinator • Written for VB Developer and SQL Server Pro
  • 3. Agenda • Increasing server performance – Caching • Output caching • Donut caching • Object caching • Velocity – Paging • Reducing network loads – Managing ViewState – Compression
  • 4. What is Scalability? • “The ability to handle growing amounts of work in a graceful manner” Wikipedia • Scalability != Performance • What affects scalability? • Everything you see today applies to .NET 2.0 and higher
  • 5. Increasing Server Performance
  • 6. Why Cache? • Because there’s a credit crunch! • Building a page is an expensive process – Database calls across servers – Web Service calls – AD lookups • Returning a stored page from a cache is much cheaper!
  • 7. Caching 1: OutputCache • Caches the rendered HTML from your page – Duration is in seconds – VaryByParam allows you to cache several versions – Location means you can cache on the web server, client, downstream machines or all of these – CacheProfiles mean you have fine config-based control – Cached pages can be removed with HttpResponse.RemoveOutputCachedItem • Composite scripts are outputcached for you automatically
  • 8. Caching 2: Donut Caching • aka Post-Cache Substitution • Inject dynamic content into a cached page before it is returned to the client – <asp:substitution> – Must use static methods with a HttpContext
  • 9. Caching 3: Caching API • Store objects in memory and pull them out when you need them • Currently System.Web.Cache – But in .NET 4.0 moving to System.Data.Cache • For data objects, you have to use DataSets and DataTables, not DataReaders
  • 10. Caching 3: CacheDependency • Objects in the cache can be dependent on other objects – When the dependency changes, the cached item is removed – Not very useful in .NET 1.1 • .NET 2.0 introduced SqlCacheDependency – Cached objects can be dependent on SQL tables – Enable using the ASPNET_REGSQL tool – Or programmatically with the SqlCacheDependencyAdmin object – Can integrate with OutputCaching
  • 11. Caching 4: Velocity • Velocity – Distributed cache • One logical cache split across several servers • PowerShell management console – CTP3 released April 09 – CTP4 September 09 • V1 Q4 09? – Microsoft.Data.Caching
  • 12. Caching 4: Velocity • Version 1 – Will not have dependencies – Most appropriate to use for session state • The future – Writethrough – Automatic caching? • See also NCache and memcached
  • 13. Paging • Default GridView paging behaviour reads the entire dataset every time – For 100 rows this probably isn’t going to matter – For 1 000 000 rows this probably isn’t so good • Write your own paging mechanism • For custom paging DataGrids are better than GridViews • In SQL 2005 the ROW_NUMBER function is your friend! • LINQ – Skip
  • 15. ViewState 1 Viewstate Size Object in bytes HTML Table 52 DataList 6628 Repeater 6600 DataGrid 10592 GridView 10928
  • 16. ViewState 2 • Taming Viewstate – Can be disabled per-control – ZIP it up and put the zipped version on the page – Keep it on the web server
  • 17. Compression 1 • All modern browsers will accept compressed content – Content is compressed on the server / decompressed by the browser – Can be enabled in IIS or – Use the HttpCompress library
  • 19. Compression 2 • JavaScript Compression – JSMin (http://tinyurl.com/jscriptmin) – jQuery is pre-minified for you • CSS Compression – Icey’s CSS Compressor (http://tinyurl.com/csscompressor) – Written in PHP
  • 20. Summary • Cache is King! • Paging is good for your pages! • Viewstate doesn’t have to be evil!
  • 22. Resources • Books – Essential ASP.NET by Fritz Onion – The ASP.NET 2.0 Cookbook by Michael Gittel & Geoffrey LeBlond – The ASP.NET Anthology by Scott Allen et al • PodCasts – http://www.dotnetrocks.com/default.aspx?showNum=24 – http://www.dotnetrocks.com/default.aspx?showNum=367 • MSDN White Paper on .NET Performance & Scalability – http://msdn.microsoft.com/en-us/library/ms998530.aspx • Strangeloop Networks Scaling Appliance – http://www.strangeloopnetworks.com/products/AS1000/
  • 23. Resources • Velocity – http://blogs.msdn.com/velocity – http://www.hanselman.com/blog/HanselminutesPodcast116DistributedCac hingWithMicrosoftsVelocity.aspx – http://videos.visitmix.com/MIX09/T59F • NCache – http://www.alachisoft.com/ncache/ • memcached – http://www.danga.com/memcached/ • Donut Caching – http://tinyurl.com/donutcaching • HttpCompress Library – http://www.blowery.org/code/HttpCompressionModule.html