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ASP.NET Memory Leak: Byte arrays rooted in System.Security.Policy.Evidence

Posted Wednesday, June 25, 2008 4:04 PM by Tess
Today I got a question from a reader (Chris) about a memory leak they are seeing in their application When we do a '!dumpheap -min 85000 -type Byte[]' we can see 100s of byte array objects using up ~545MB of memory. A majority of the objects are the same Read More...
3 Comments

CLR Inside Out: Large Object Heap Uncovered

Posted Monday, June 09, 2008 10:22 AM by Tess
In many of my posts I have discussed performance issues and memory issues caused by excessive use of the Large Object Heap, here are a few examples... ASP.NET Case Study: High CPU in GC - Large objects and high allocation rates ASP.NET Case Study: Bad Read More...
1 Comments

ASP.NET Memory: Thou shalt not store UI objects in cache or session scope

Posted Wednesday, May 28, 2008 2:23 PM by Tess
ASP.NET Memory: Thou shalt not store UI objects in cache or session scope Surprisingly the issue I wrote about in " the eventhandlers that made the memory baloon " (Jan 2006) is something that still happens very frequently, I reference it in Read More...
16 Comments

The 21 most popular blog posts

Posted Wednesday, May 21, 2008 3:45 PM by Tess
I started this blog 2.5 years ago today, mostly because I felt that the same types of issues came up over and over and over in our support cases. I figured that if I started writing about them, a lot of people would be able to resolve them on their own, Read More...
8 Comments

DebugDiag 1.1 or Windbg, which one should I use? and how do I gather memory dumps

Posted Wednesday, May 21, 2008 1:40 PM by Tess
If you have read any of my posts you have probably noticed that I am very partial to windbg and the debugging tools for windows. I often get friendly nudges from the developers of debugdiag when I suggest using adplus and windbg on internal discussion Read More...
7 Comments

Does interrupting GC.WaitForPendingFinalizers interrupt finalization?

Posted Monday, April 21, 2008 8:09 AM by Tess
I got a question the other day around calling GC.Collect and GC.WaitForPendingFinalizers. The issue revolved around a problem where the finalizer was blocked and where the application would call GC.Collect() and GC.WaitForPendingFinalizers() which then Read More...
2 Comments

How does the GC work and what are the sizes of the different generations?

Posted Thursday, April 17, 2008 2:10 PM by Tess
During our ASP.NET debugging chat there were many questions around the GC and the different generations. In this post I will try to explain the basics of how the GC works and what you should think about when developing .net applications in relation to Read More...
11 Comments
Attachment(s): FUN421_Stephens.ppt

My presentation on Troubleshooting ASP.NET production issues at Developer Summit 2008

Posted Friday, April 11, 2008 1:23 PM by Tess
The purpose of my presentation was to show some common pitfalls and of course to show off windbg and sos just to show people that if you have a hang, perf issue, memory leak or crash, there are tools out there that can help you figure out the root cause Read More...
2 Comments
Attachment(s): DevSummit.zip

.NET Debugging Demos Lab 7: Memory Leak - Review

Posted Thursday, April 03, 2008 2:33 PM by Tess
We have reached the end of the .NET Debugging Demos series. And we are going to end it with a review of the last memory leak lab. I am interested to get feedback, either in comments or through email in the contact me section, on what you liked, what you Read More...
7 Comments

.NET Debugging Demos Lab 7: Memory Leak

Posted Tuesday, March 25, 2008 4:33 PM by Tess
This is the last debugging lab in the .NET Debugging Demos series. By now you should have the basics down for troubleshooting hangs, perf issues, memory leaks and crashes in .net applications. Hope you have enjoyed your debugging sessions. The last one Read More...
2 Comments

.NET Debugging Demos Lab 6: Memory Leak - Review

Posted Monday, March 17, 2008 12:31 PM by Tess
Since it took me so long to get Lab 6 out the door i'll post the review right away... After this we only have one memory leak lab to go before you have gone through the whole lab set. Previous demos and setup instructions If you are new to the debugging Read More...
7 Comments

.NET Debugging Demos Lab 6:_Memory Leak

Posted Monday, March 17, 2008 12:26 PM by Tess
It's been about a week since I posted the debugging challenge for this lab, things have been a bit busy lately so sorry about the tardiness on posting the lab. I have a love-hate relationship with statistics, I like them cause you can use them to get Read More...
1 Comments

.NET Debugging Demos Lab 6: Debugging Challenge (Memory leak)

Posted Friday, March 07, 2008 1:38 PM by Tess
Here is the debugging challenge for lab 6... this one is really tricky... I will post the step-by-step instructions and review in about a week, but for now I will only post a problem description. As with lab 5, your mission, should you choose to accept Read More...
4 Comments

.NET Debugging Demos Lab 4: High CPU Hang - Review

Posted Wednesday, February 27, 2008 12:31 PM by Tess
Hope you have had a chance to go through the high CPU lab... Some people already commented with the solution in the lab instructions for this lab but here are my answers and commentary on the lab. Reproducing the issue: 1. Recycle IIS (IISReset) 2. Browse Read More...
8 Comments

Generational GC (Garbage Collector) - A post-it analogy

Posted Tuesday, February 26, 2008 4:08 PM by Tess
I was working through the High CPU Lab Review which is basically caused by high CPU in GC. To understand what happens you need to know what a generational GC is and why it's useful. Last year sometime I used a restaurant as an analogy for how memory allocations Read More...
6 Comments
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