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What is the max number of concurrent websocket connections a tomcat instance can support? We are looking to serve 20000 connections at any given time. What would be the recommended number of tomcat instances to support the load?
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With at least 30 GiB RAM you can handle 1 million concurrent sockets.
The theoretical limit is 65k connections per IP address but the actual limit is often more like 20k, so we use multiple addresses to connect 20k to each (50 * 20k = 1 mil).
A server can open WebSocket connections with multiple clients—even multiple connections with the same client. It can then message one, some, or all of these clients. Practically, this means multiple people can connect to our chat app, and we can message some of them at a time.
Now Chrome allows 255 websocket connections.
Take a look at this: https://github.com/cloudmark/spring-websockets-performance-testing They use Tomcat 8 but i think there will not be a fundamental difference in performance.
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