Review number of acceptor threads

[sbordet]

Jetty version(s)
12+

Description
As reported in #11421, people can get confused by multiple acceptor threads competing for the blocking accept() call.

A suggestion is that the heuristic should default to 1, or even to 0 (i.e. the accepts will be non-blocking).

[zhipengzuo]

hello ,about selectors should be set?

[sbordet]

@zhipengzuo can you clarify your question?

[zhipengzuo]

@zhipengzuo can you clarify your question?
if you set acceptor = 1
should I also set selectors=1?

[gregw]

@zhipengzuo you typically want more than 1 selector if you want high throughput. Thus I would leave this at -1 to let the heuristic pick a value for you.
If you do want to be specific about it, then you would need to benchmark your specific algorithm to find the best value (which is unlikely to be 1).

[sbordet]

@zhipengzuo see also the documentation:
https://eclipse.dev/jetty/documentation/jetty-12/programming-guide/index.html#pg-server-http-connector-selectors

[zhipengzuo]

@zhipengzuo see also the documentation: https://eclipse.dev/jetty/documentation/jetty-12/programming-guide/index.html#pg-server-http-connector-selectors

thanks.