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Performance - System.Web - Comiplation Debug="true"

Posted on 2009-04-30
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Last Modified: 2012-05-06
The default web.config for an ASP.NET Web Site has the <compilation debug="true" />.  The web.config warns that leaving this setting on in production is not advised because it impacts performance.

Does anyone know how much of a performance impact this setting incurs?  If it is turned off is there still a way to capture detailed information about where in the code an Exception occurs by logging the Exceptions?

Thanks,

PJ
<system.web>
    <!-- 
            Set compilation debug="true" to insert debugging 
            symbols into the compiled page. Because this 
            affects performance, set this value to true only 
            during development.
        -->
    <compilation debug="true"/>

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Question by:ppittle
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Expert Comment

by:rodmjay
ID: 24274233
i do HealthMonitoring, depending on your app, but you can capture exceptions using try/catch, and then catch them with the health monitoring provider and have it send email or log ot event log or database, or however you want to do it.
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by:ppittle
ID: 24274294
rodmjay,

Two Questions:
1)  If <compilation debug="false" /> is set in the web.config, is anything lost from Exception objects when they're captured in a try/catch and logged?  For example, is the stack trace still present?

2)  Are you aware of any measured data indicating how much of a performance loss is incurred by leaving <compilation debug="false" />?

PJ
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Accepted Solution

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rodmjay earned 2000 total points
ID: 24274350
here are a few considerations with debug=true, i would suggest not using it in production

Pages are not batch compiled.
Pages do not time out. When a problem occurs, such as a problem with a Web service call, the Web server may start to queue requests and stop responding.
Additional files are generated in the Temporary ASP.NET Files folder.
The System.Diagnostics.DebuggableAttribute attribute is added to generated code. This causes the CLR to track extra information about generated code, and it also disables certain optimizations.

There would be coniderable performace from each of these
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Author Closing Comment

by:ppittle
ID: 31576651
Thanks for the info.
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