Performance Tuning and Application Instrumentation in .NET

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Performance Tuning and Application Instrumentation
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TextWriterTraceListener
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It may not be desirable to see the stack trace information, which is generated by the DefaultTraceListener. The following code creates a TextWriterTraceListener, which is used to output Debug information to a text file and does not generate stack trace information to the file.
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Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) Fires when the application is started Dim fname As String = C:\debug.txt Dim fs As New FileStream(fname, FileMode.OpenOrCreate, _ FileAccess.Write) Dim tr As New TextWriterTraceListener(fs, file ) Debug.Listeners.Add(tr) Debug.AutoFlush=true End Sub Sub Application_End(ByVal sender As Object, ByVal e As EventArgs) Fires when the application ends Dim tr As TraceListener tr = Debug.Listeners( file ) tr.Close() Debug.Listeners.Remove( file ) End Sub
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This code opens a file when the Web application starts and closes the file when the Web application ends. Notice that AutoFlush is set to true to ensure that data is not held in the buffer for a long period.
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EventLogTraceListener
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Use the EventLogTraceListener to output Debug and Trace information to an event log. The following example creates an instance of the EventLog class and then an instance of the EventLogTraceListener with the EventLog instance.
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Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) Fires when the application is started Dim elog As New EventLog( Application ) elog.Source = Ch14Web Dim el As New EventLogTraceListener(elog) el.Name = eventLog Debug.Listeners.Add(el) End Sub Sub Application_End(ByVal sender As Object, ByVal e As EventArgs) Fires when the application ends
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Dim el As TraceListener el = Debug.Listeners( eventLog ) el.Close() Debug.Listeners.Remove(el) End Sub
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The Application_Start event method creates the EventLogTraceListener and adds it to the Debug.Listeners collection. The Application_End event method removes the EventLogTraceListener. Figure 14.3 shows the event in the Application event log.
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When a new source is being defined, the EventLogTraceListener code shown in this section attempts to create the event log source on the fly. This requires the write permissions in the Registry that the default ASPNET account does not have. If the event log source already exists, no additional permissions are required for the ASPNET account. To correct the problem, temporarily turn on impersonation in the Web.config file by adding the following tag after the authentication tag:
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<identity impersonate= true userName= admin password= pwd />
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Figure 14.3 The Application event log showing events that have been written to the log using the EventLogTraceListener.
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Performance Tuning and Application Instrumentation
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Web Trace
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The previous sections covered the System.Diagnostics.Trace class, but the System.Web.UI.Page class has a Trace property, which is an instance of the TraceContext class. This class provides a simple solution to Web page instrumentation by building an HTML representation of the Trace output information. With ASP, the developer used Response.Write statements to display various bits of information to help with debugging a Web page. With Trace, the debugging information can be easily turned on or off. The Trace output displays the Trace messages that have been added to the code and displays information about the Web page, such as the QueryString, the form data, header information, and the time that was required to build the page. Trace provides you with the ability to perform page- or application-level tracing. Page-level tracing is configured at the Web page; whereas applicationlevel tracing is configured in the Web.config file. Trace information is written by using the Trace.Write and Trace.Warn methods. Trace.Warn displays its message using red font.
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Page-Level Trace
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You turn on page-level tracing at the Web page by placing the following code at the top of the HTML page:
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<%@ Page Trace= true TraceMode= SortByCategory %>
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After tracing is turned on at the page, the trace output is appended to the Web page output. If the PageLayout is set to FlowLayout, the trace output appears at the bottom of the Web page. If the PageLayout is set to GridLayout, the trace output is displayed as a background to the page. The following sample code produces the output shown in Figure 14.4:
Public Class WebForm2 Inherits System.Web.UI.Page Protected WithEvents Button1 As System.Web.UI.WebControls.Button Private Sub btnLogin_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnLogin.Click Trace.Write( Button1 , This is the start of Button1_Click ) Trace.Warn( Button1 , In the middle of Button1_Click ) Trace.Write( Button1 , This is the end of Button1_Click ) End Sub End Class