[erlang-questions] Why does "+K true" degrade TCP/IP performance?

Richard Andrews <>
Fri Jan 16 04:48:44 CET 2009


> Is there people who using benefits of "+K true"? Please tell me, what
> should I use it for?

I've never used the erl +K option but my understanding is that epoll provides benefits when you have a large number of open sockets to watch. The benefits are because the file-descriptor set is stored in the kernel and only needs to be modified when there are changes, not marshalled and resent completely every call like for poll().


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