Thanks for Gaurav's input,

Hi PBENISTY,

As Gaurav has said, ASP.NET runtime won't deactive a certain application
and the behavior you met is likely due to the ASP.NET worker process idle
shutdown.  Here are some basic background about ASP.NET 2.0 application's
host and compilation features:

**By default, if you do not precompile (or partially precompile --- as
updatable) your ASP.NET(webservice or web page) application, when you first
time request a certain page or webservice endpoint(asmx), the runtime will
perform dynamic compilation. and this is ususally the start-up time you
encounter. After the page or webservice code be dynamically compiled ,
seqential requests won't cause recompile again.

**Event after page or webservice has been dynamically compiled or through
precompilation, there still may occur a delay when we first time request a
page, that is the time the .net execution engin compile .net code into
native code(called jit compilation)

So the above two things make up the totally initial delay when we first
time request page or webservice endpoint in the ASP.NET application.

For the first one(page, asmx's compilation), ASP.NET 2.0 provide precompile
means to let us precompila an website or webservice application. You can
choose to precompile the completely (make the output web application not
updatable) or partially( still can update aspx file after deployment). You
can have a look at the following msdn reference about ASP.NET web site
precompilation:

#ASP.NET Web Site Precompilation Overview  
http://msdn2.microsoft.com/en-us/library/399f057w.aspx

also, the VS IDE provide GUI menu for publish a website as precompiled
format:

#Publishing Web Sites  
http://msdn2.microsoft.com/en-us/library/377y0s6t.aspx

As for the second one(jit-compilation), this is not affected by
precompilation , and is a common behavior of all .net application. And for
your scenario, if your ASP.NET application's worker process restart, or the
application is restart due to some certain external change(web.config or
"bin" dir be modified ....), all the jit-compiled content will be invalid
and the application will restarted. Next time, when any page , webservcie
endpoint be visited in the application, it will take a period to do the
initial compilation again.    

There is one option in ASP.NET process model to configure the idle time of
worker process. This timeout means how long will the ASP.NET worker process
live even there is no request comming to that worker process(its hosted
ASP.NET applications):

#Configuring ASP.NET Applications in Worker Process Isolation Mode (IIS 6.0)
http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/2
6d8cee3-ec31-4148-afab-b6e089a0300b.mspx

You can set it to a large value or event uncheck it so that the worker
process will never be shutdown due to long idle.

Hope this helps. Please feel free to post here if you have anything unclear
or any further questions on this.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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