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.NET Hang Case study: The danger of locking on strings

Posted Monday, October 19, 2009 3:51 PM by Tess
I had an interesting case today where an asp.net app was stuck in a true deadlock. In other words two threads were both waiting for resources that the other thread owned. The scenario in these cases usually goes something like this: FunctionA (locks on Read More...
6 Comments

ASP.NET Case Study: Hang when loading assemblies

Posted Tuesday, September 22, 2009 3:03 PM by Tess
The other day I came across an issue where an ASP.NET site stopped responding and didn’t start serving requests again until the W3WP.exe process was restarted. We grabbed some memory dumps with debug diag before restarting the process to see what was Read More...
3 Comments

First step in troubleshooting complex issues: Define and scope your issue properly

Posted Wednesday, September 09, 2009 1:21 PM by Tess
Is it a plane, is it a bird, is it a UFO? Before you can delve into any kind of troubleshooting of an issue you need to thoroughly define it.  If you don’t you’ll probably end up spending a lot of time randomly gathering and looking at data that Read More...
8 Comments

A case of lost session variables when using out of process session state

Posted Friday, June 26, 2009 4:39 PM by Tess
Recently I had a case where the customer had an issue with session variables.  The claim was that if they use in-proc session state their session variables would work just fine, but if they changed the session mode to stateserver in web.config their Read More...
0 Comments

First look at debugging .NET 4.0 dumps in Visual Studio 2010

Posted Tuesday, June 16, 2009 12:01 PM by Tess
I know that for a lot of you this is a bit far into the future, but I thought it would be nice to run through a few of my lab scenarios to show off some of the new features in Visual Studio 2010.  I am sure that I will miss a bunch of cool features Read More...
11 Comments

Neat .NET 2.0 StackViewer to troubleshoot hangs/performance issues

Posted Friday, May 08, 2009 3:54 PM by Tess
Bret wrote a post about Managed Stack Explorer , a really nice tool that was developed in 2006 but since then seems to have been forgotten. It’s excellent if you want to troubleshoot hangs/performance issues in a process but don’t want to go through the Read More...
12 Comments

Developers are from Mars, Ops people are from Venus… or It looked good on paper

Posted Friday, April 03, 2009 3:54 PM by Tess
A few weeks back me and Micke (one of our Architect Evangelists) had a session at TechDays where we talked about “things that looked good on paper” i.e. things that sound pretty ok in the design/development phase but sometimes turn out to be a disaster Read More...
19 Comments

.NET Hang: Analyzing Debug Diag output

Posted Friday, January 23, 2009 11:00 AM by Tess
Earlier this week I got an email from a reader who had a hang in an application and sent in some Debug Diag logs. In order for me to dig in deeper I would need to open a support case as I would have to ask follow up questions and look at the dumps etc. Read More...
5 Comments

.NET Hang: My application hangs after I called my WCF service a couple of times

Posted Friday, January 09, 2009 10:42 AM by Tess
I know it is a little late, but Happy New Year to all of you. My holiday break was great, and I wish I would have had some more time to blog, but instead I got an XBOX 360 and a Guitar Hero World Tour game so the blog had to take the back seat for a while… Read More...
11 Comments

Video of my TechEd presentation of Common Issues in ASP.NET and how to debug them with Windbg

Posted Thursday, November 27, 2008 4:25 PM by Tess
My TechEd presentation “Common Issues in ASP.NET and how to debug them with Windbg” is now up on channel 9, so if you want to watch it, here you go http://channel9.msdn.com/posts/MSDNSweden/Vanliga-fel-som-grs-med-ASPNET-och-hur-du-hittar-dem-med-WinDbg/ Read More...
9 Comments

Slides for interactive TechEd Sessions about debugging .net issues in windbg

Posted Friday, November 21, 2008 10:37 AM by Tess
... and here are the slides for the interactive session Read More...
2 Comments
Attachment(s): Debugging Performance Issues, Memory Issues and Crashes in .net Applications-rev.pptx

Slides and resources for TechED presentations about debugging .NET issues with Windbg

Posted Friday, November 21, 2008 10:32 AM by Tess
I still have to figure out a way to host the video from the break-out session but until then, here are the slides for my presentations (attached). And here are a list of some of the tools and resources I used for the presentations Tool/Resource Comment Read More...
8 Comments
Attachment(s): Common ASP.NET Production Issues-rev.pptx

Performance by Design – PDC 2008

Posted Thursday, October 30, 2008 1:40 PM by Tess
Rico Mariani (Chief Architect of Visual Studio – previously performance architect for .net), Vance Morrison (Performance architect for .net) and Mark Friedman (Architect Lead for the Developer Division of Performance Engineering) had a full day talk at Read More...
1 Comments

Using VSTS Test and Profilers to troubleshoot a High CPU in GC issue

Posted Tuesday, October 07, 2008 4:23 PM by Tess
Following my post about how to troubleshoot a low CPU performance issue with VSTS Test, I will now do the same for lab 4 where we have high CPU in GC. The scenario is pretty similar in that we have a page ( http://localhost/BuggyBits/AllProducts.aspx Read More...
5 Comments

Using VSTS Test and Profilers to troubleshoot performance issues (low cpu hang)

Posted Wednesday, October 01, 2008 5:01 PM by Tess
I’ve been wanting to dig into the Test features in Visual Studio Team System for a while to “debug” issues during the test phase. In my previous post I linked to a Swedish screen cast by Mikael Deurell, but for those of you who don’t know Swedish I thought Read More...
17 Comments
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