Achieving 2 Million Websocket Connections in Phoenix

Learn how the Phoenix web framework managed to handle 2 million simultaneous connections through documented benchmarking techniques and optimizations.

Published 5 months ago on www.phoenixframework.org

Abstract

The article details the journey of achieving 2 million websocket connections in Phoenix by documenting the techniques, benchmarks, and optimizations. Starting from reaching 1k connections, the team progressed to using Tsung for distributed load testing, optimizing configurations, observing performance, and scaling up to eventually hit 2 million connections by pooling pubsub servers and ets tables.

Results

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Discussion

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Relevance

This article is crucial for understanding the process of scaling websocket connections in Phoenix, highlighting the importance of benchmarking, optimizing configurations, and overcoming performance bottlenecks. It offers insights into handling massive concurrent connections, which is valuable for scaling real-time applications.

Applicability

To scale websocket connections in your projects, you should consider benchmarking your application, using tools like Tsung for load testing, optimizing server configurations for high concurrency, and exploring techniques like pooling servers and sharding to handle large numbers of connections effectively.

Risks

One risk to be aware of is hitting system resource limits when scaling up connections, which can cause performance issues or crashes. Additionally, handling a large number of connections can lead to bottlenecks in pubsub servers and ets tables, requiring careful optimization and distributed solutions.

Conclusion

The trend towards handling massive websocket connections showcases the growing demand for real-time capabilities in web applications. As more services require high-concurrency websocket support, developers need to focus on efficient scaling techniques and distributed architectures to meet these demands in their projects.

References

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The Road to 2 Million Websocket Connections in Phoenix - Phoenix Blog
If you have been paying attention on Twitter recently, you have likely seen some increasing numbers regarding the number of simultaneous connections the Phoenix web framework can handle. This post documents some of the techniques used to perform the benchmarks.

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