Learn how to tackle performance issues with `Dotnet 6` and `SignalR` on `IIS` after deployment resets. We’ll provide clear solutions to enhance connection handling and responsiveness.
---
This video is based on the question https://stackoverflow.com/q/73736660/ asked by the user 'mccow002' ( https://stackoverflow.com/u/807851/ ) and on the answer https://stackoverflow.com/a/73748759/ provided by the user 'Zach Gardner' ( https://stackoverflow.com/u/19942135/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.
Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Dotnet 6 using Signalr slows down IIS after reset
Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.
If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting Dotnet 6 SignalR Performance Issues in IIS
If you're a developer working with Dotnet 6 and SignalR, you might have encountered the issue of your web application hosted on IIS experiencing significant slowdowns after a reset. This can be frustrating, especially when you’re dealing with multiple SignalR connections that need to restart. In this post, we will dissect the situation and explore effective solutions for optimizing SignalR’s performance in a Dotnet 6 environment.
The Problem
When hosting an application on IIS, it's common practice to stop and start the application during deployments. If your application manages 400 to 500 open SignalR connections, this would typically result in these connections being dropped, leading to reconnections upon restart. While this was manageable with Dotnet 5, many users have reported a frustrating slowdown with Dotnet 6, where even simple requests can exceed 50 seconds.
Key Questions to Consider:
Is there a bug impacting performance in Dotnet 6?
Do the characteristics of SignalR hubs in Dotnet 6 differ from those in Dotnet 5?
How can you mitigate performance issues during application restarts?
Proposed Solutions
1. Separate Application Pools
A critical point to consider is how your SignalR hub and .NET Core 6 API are configured in terms of application pools. If both are running within the same application pool, it can cause resource contention issues.
Recommended Actions:
Divide Deployable Artifacts: Consider separating your SignalR hub from your main API into distinct deployable artifacts.
Utilize Different Application Pools: By placing them in separate application pools, you reduce the resource competition between your API and SignalR hub.
2. Implementing a SignalR Backplane
Another factor that can impact your SignalR performance is the architecture of your hubs. If your SignalR hubs are running on a single server without a backplane, you may face issues regarding high availability (HA) and scalability.
What is a SignalR Backplane?
A SignalR backplane allows you to distribute messages across different servers, enabling message sharing and ensuring that all clients receive messages, regardless of which server they are connected to.
Recommended Actions:
Configure a Backplane Service: If you aren't already using a backplane, consider implementing one.
Explore Azure SignalR Service: As a managed service, the Azure SignalR Service can provide a more efficient, less costly total cost of ownership (TCO) compared to maintaining an on-premises SignalR cluster.
3. Performance Monitoring and Logging
To better understand what's causing slowdowns during IIS resets, integrate performance monitoring and logging into your application. This can provide insights into your connection handling and help pinpoint bottlenecks.
Action Steps:
Implement Diagnostics: Use tools like Application Insights or other logging frameworks to monitor application performance effectively.
Analyze Connection Metrics: Review connection times, response failures, and other relevant metrics to identify trends or patterns associated with lagging performance during restarts.
Conclusion
In conclusion, if you're facing issues with your Dotnet 6 application hosted on IIS during deployment resets, consider separating your application pools and implementing a backplane for your SignalR hubs. By maintaining clear architecture and leveraging services like Azure SignalR, you can significantly enhance your application's performance and scalability. Remember, monitoring and diagnostics play a critical role in navigating performance challenges.
By making these adjustments, you should see an improvement in responsive
Информация по комментариям в разработке