Posts
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Timers, Finalizers and Memory Leaks
I was involved in a production incident investigation recently related to a high memory usage by one of our .NET services. A process was gradually consuming more and more memory and eventually fails with
OutOfMemoryException. -
StackOverflowException vs. OutOfMemoryException
I was investigating crash dumps for one of our services and faced a puzzling group of crashes. These crashes were caused by a
StackOverflowExceptionwith relatively short stack traces. It wasn’t due to infinite recursion, just a logging method that was allocating 64K on the stack. Given that it was a Windows process with standard thread creation logic, each stack should have 1MB, making a stack overflow in this case not possible. -
Task.Factory.StartNew and long running async tasks
Let’s say you want to implement a Producer-Consumer pattern based on
System.Threading.Channelto process items asynchronously: -
You probably should stop using a custom TaskScheduler
If you don’t know what
TaskScheduleris and you don’t have a custom version of it in your project, you probably can skip this post. But if you don’t know what it is but you do have one or two in your project, then this post is definitely for you. -
Figuring out mysterious `MissingMethodException` in a simple C# application
As we already know from C# Language Features vs. Target Frameworks you can use most of the latest C# language features targeting .Net Standard or Full Framework. Some features just work with any target frameworks, but some require special attributes or types to be defined during compilation.
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C# Language Features vs. Target Frameworks
If you check the official C# language versioning page you might think that there is a very strong relationship between the target framework and the C# language version.
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String Interning - To Use or Not to Use? A Performance Question
I recently join a new team and one of the projects was having a high memory footprint issues. There are a few mitigations put in place and one of them was to de-duplicate strings by using string interning.
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Classes vs. Structs. How not to teach about performance!
It’s been a while since my last blog post, but I believe it’s better to post late than never, so here I am!
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Dissecting Interpolated Strings Improvements in C# 10
There are many interesting features coming into C# 10 and my favorite one is the improvements of interpolated strings. It may sound weird that the #1 feature for me is not a new one but an improvement of an existing one. That’s because I do care a lot about performance and the interpolated string improvements in C# 10 will make my code faster without any changes from my side. But that’s not it. The new design is not only allows creating strings faster, but it also allows skipping the string creation altogether!
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Shooting Yourself in the Foot with Concurrent Use of FileStream.Position
Let’s explore the following scenario: you have a service that copies files between machines. And to track the progress there is a special “copy watcher” thread (or task) that logs a current position of the target stream by accessing a
FileStream.Positionproperty. -
The Dangers of Task.Factory.StartNew
I’ve faced a very interesting problem recently with one of our production services: the service partially stopped responding to new requests even though some other parts of the service were still working.
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