DEV411 ASP.NET: Best Practices For Performance Stephen Walther

Purpose of Talk What is the fastest method of displaying a set of database records in an ASP.NET Page?

Testing Tools Trace Tools Profiler Tools Load Tools

Trace Tools ASP.NET Page or Application Tracing Display trace information on page System.Diagnostics Tracing Write trace information to custom listener

Trace Tools

Profiler Tools CLR Profiler Free Profiler from Microsoft ANTS Profiler Available at SQL Profiler Included with Microsoft SQL Server

ANTS Profiler

Load Tools Application Center Test Included with Visual Studio.NET Enterprise Web Application Stress Tool (WAST) Free download from Microsoft site ANTS Load Available at Includes calculated Frustration Coefficient

Test Setup Application Center Test (ACT).NET Framework 1.1 SQL Server 2000 Windows Server 2003 (Standard)

Performance Statistics Requests Per Second (RPS) Time To Last Byte (TTLB) Page Execution Time

Timer Module The Timer Module records the time interval between PreRequestHandlerExecute Event PostRequestHandlerExecute Event

Timer Module PostRequestEventHandlerExecute EndRequest Load Init Unload TimerModule.cs PreRequestEventHandlerExecute BeginRequest Application Events Page Events

Clock Resolution QueryPerformanceCounter is accurate to 1/ of a second or about a millionth of a second

The Test Request page 1050 times Discard first 50 requests Log time of each request Average results

Database Setup Four Database Tables Products10 – 10 Rows Products50 – 50 Rows Products100 – 100 Rows Products500 – 500 Rows

Whats Faster? DataReaderDataSet DisplayDataReader.aspx DisplayDataSet.aspx

DataReader

DataSet

DataReader Versus DataSet

DataReader Versus DataSet Final Results On average, a DataReader is 16% faster than DataSet

3rd Option – ArrayList Using an ArrayList instead of a DataReader results in similar performance with the advantages of a static representation of data DisplayArrayList.aspx

ArrayList

Whats Faster? SqlDataReaderOleDbDataReader

OleDbDataReader

OleDbDataReader Final Results On average, a SqlDataReader is 115% faster than an OleDbDataReader

Whats Faster? Inline SQL Stored Procedure

Whats Faster? DataReader Column Reference By Name: Response.Write(dr[ProductName]); By Ordinal: Response.Write(dr[0]); By GetString(): Response.Write(dr.GetString(0));

Column Reference

Column Reference Final Results On average, ordinal reference is 11% faster than by name

Whats Faster? Proper Case dr[ProductName] Improper Case dr[PRODUCTNAME]

Proper Case

Proper Case Final Results Using proper column case is 1% faster than improper column case

Whats Faster? Inline ASP.NET Controls

DataGrid

DataGrid Final Results Inline script is 233% faster than a DataGrid

Whats Faster? DataGrid with ViewState Disabled DataGrid with ViewState Enabled

ViewState

ViewState Final Results DataGrid with ViewState disabled is 66% faster than DataGrid with ViewState enabled

Whats Faster? AutoGenerateColumns Template Columns

Template Columns Final Results A DataGrid without templates is 39% faster than a DataGrid with templates

Whats Faster? How to improve template performance? DataBinder.Eval Explicit Cast ItemDataBound void ItemDataBound(Object s, DataGridItemEventArgs e) DisplayItemDataBound.aspx

Template Performance

Template Performance Final Results Explicit cast is 11% faster than using a databinding expression

Creating A Custom Control Would a custom DataGrid (with severely reduced functionality) be faster than the standard DataGrid? FastGrid.cs

Custom Control

Custom Control Final Results FastGrid is 37% faster than a standard DataGrid

Whats Faster? DataGrid with no caching DataGrid with data caching DataGrid with output caching

Data Caching

Data Cache Final Results Using the data cache is 637% faster than a standard DataGrid

Output Cache

Output Cache Final Results Using the output cache is infinitely faster than using a standard DataGrid

Conclusions A DataReader is faster than a DataSet An inline DataReader is faster than a DataGrid You pay a high price for ViewState AutoGenerateColumns is faster than template columns Caching is always a good idea!

Performance Resources Microsoft Sites Performancehttp://msdn.microsoft.com/netframework/using/understanding/perf/default.aspxBooks Improving.NET Application Performance and Scalability Web Application Stress Tool CLR Profiler beebdda&displaylang=en ANTS Profiler and ANTS Load

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