How to: Instrument a Dynamically Compiled ASP.NET Web Application and Collect Detailed Timing Data with the Profiler by Using the Command Line
This topic describes how to use Visual Studio Team System Developer Edition Profiling Tools command-line tools to collect detailed timing data for a dynamically compiled ASP.NET application by using the instrumentation profiling method.
To collect performance data from a ASP.NET Web application, youmodify the web.config file of the target application to enable the VSInstr.exe tool to instrument the dynamically compiled application files. You then use the VSPerfCLREnv.cmd tool to set the appropriate environment variables on the Web server to enable profiling, and then restart the computer.
Start the profiler and then run the target application. While the profiler is attached to the application, you can pause and resume data collection.
When you are finished profiling, close the application, close the Internet Information Services (IIS) worker process, and then shut down the profiler. When you have completed your profiling work, restore the web.config file and the Web server to their original states.
To configure the ASP.NET Web application and the Web server
Modify the web.config file of the target application. See How to: Modify Web.Config Files to Instrument and Profile Dynamically Compiled ASP.NET Web Applications.
Open a command prompt window. If necessary, add the profiler tools directory to your PATH environment variable. The path is not added at installation.
32 bit computers
On 32 bit computers, the default profiler tools directory is
\Program Files\Microsoft Visual Studio 9.0\Team Tools\Performance Tools.
64 bit computers
On 64 bit computers, specify the path according to the target platform of the application to be profiled.
To profile 32 bit applications, the default profiler tools directory is
\Program Files (x86)\Microsoft Visual Studio 9.0\Team Tools\Performance Tools
To profile 64 bit applications, the default profiler tools directory is
\Program Files (x86)\Microsoft Visual Studio 9.0\Team Tools\Performance Tools\x64
For example, to add the profiler directory to PATH on a 32 bit computer, type
set path=%path%;C:\Program Files\Microsoft Visual Studio 9.0\Team Tools\Performance Tools
Initialize the profiling environment variables. Type:
/globaltraceon enables profiling by using the instrumentation method.
Restart the computer.
To profile the Web application
Open a command prompt window. If necessary, add the profiler path to the PATH environment variable.
Start the profiler. Type:
The /start:trace option initializes the profiler.
The /output:OutputFile option is required with /start. OutputFile specifies the name and location of the profiling data (.vsp) file.
You can use any of the following options with the /start:trace option.
The /user and /crosssession options are usually required for ASP.NET applications.
Start the ASP.NET Web application in the typical way.
While the target application is running, you can control data collection by starting and stopping the writing of data to the profiler data file by using VSPerfCmd.exe options. Controlling data collection enables you to collect data for a specific part of program execution, such as starting or shutting down the application.
To start and stop data collection
The following pairs of options start and stop data collection. Specify each option on a separate command line. You can turn data collection on and off multiple times.
You can also use the VSPerfCmd.exe /mark option to insert a profiling mark into the data file. The /mark command adds an identifier, a timestamp, and an optional user-defined text string. Marks can be used to filter the data in profiler reports and data views.
To end a profiling session, close the target ASP.NET Web application, reset Internet Information Services (IIS) to stop the profiled process, and then shut down the profiler.
To end a profiling session
Close the ASP.NET Web application.
Close the ASP.NET worker process by resetting Internet Information Services (IIS). Type:
Shut down the profiler. Type:
Restart IIS. Type:
When you have completed all profiling, replace the web.config file, clear the profiling environment variables, and restart the computer to restore the application and server to to the states that they were in before profiling.
To restore the application and computer configuration
Replace the web.config file with a copy of the original file.
Clear the profiling environment variables. Type:
Restart the computer.