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POWeb Based Stack Dump Tool for ASP.NET Using Mdbg?
 

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    <p>There is a great <a href="http://www.infoq.com/presentations/MySpace-Dan-Farino" rel="noreferrer">presentation</a> by Dan Farino, Chief Systems Architect at <strong>MySpace.com</strong>, showcasing a web-based stack dump tool that catalogues all threads running in a given process (what they're doing, how long they've been executing, etc.) </p> <p>Their techniques are also summarized on <a href="http://highscalability.com/myspace-architecture" rel="noreferrer">highscalability.com</a>:</p> <ul> <li><strong>PerfCollector</strong>.<br/> Centralized collection of performance data via UDP. More reliable than Windows and allows any client to connect and see stats.</li> <li><strong>Web Based Stack Dump Tool.</strong><br/> Can right-click on a problem server and get stack dump of the .Net managed threads. Used to have to RDC into system and attach a debugger and 1/2 later get an answer. Slow, nonscalable, and tedious. Not just a stack dump, gives a lot of context about what the thread is doing. Troubleshooting is easier because you can see 90 threads are blocked on a database so the database may be down. </li> <li><strong>Web Base Heap Dump Tool.</strong><br/> Dumps all memory allocations. Very useful for developers. Save hours of doing it by hand. • Profiler. Traces a request from start to finish and produces a report. See URL, methods, status, everything that will help you identify a slow request. Looks at lock contentions, are a lot of exceptions being thrown, anything that might be interesting. Very light weight. It's running on one box in every VIP (group of 100 servers) in production. Samples 1 thread every 10 seconds. Always tracing in background.</li> </ul> <p><strong>The question is: what tools are required to build a web-based stack dump tool for ASP.NET?</strong> For convenience, let's assume that an *.aspx hosted in the target AppDomain, able to output all managed call stacks in that process, is sufficient.</p> <p>There are a few posts that cover the use of <strong>Mdbg</strong> (debugger for managed code written entirely in C#/IL that started shipping with CLR 2 SDK) and the <strong>mdbgcore</strong> assembly typically found in C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin:</p> <ul> <li><a href="http://dotnetdebug.net/2005/11/09/exceptiondbg-v01-debug-your-exceptions/" rel="noreferrer">http://dotnetdebug.net/2005/11/09/exceptiondbg-v01-debug-your-exceptions/</a></li> <li><a href="http://blogs.msdn.com/jmstall/archive/tags/MDbg/default.aspx" rel="noreferrer">http://blogs.msdn.com/jmstall/archive/tags/MDbg/default.aspx</a></li> <li><a href="http://blogs.msdn.com/vijaysk/archive/2009/11/04/asp-net-debugger-extension-for-iis-7.aspx" rel="noreferrer">http://blogs.msdn.com/vijaysk/archive/2009/11/04/asp-net-debugger-extension-for-iis-7.aspx</a></li> </ul> <p>Would a solution simply reference this assembly to produce the desired output? What impact would a "list all managed call-stacks" operation have on the running process that's servicing production traffic?</p>
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