Do NIO selectors use event notifications by default?

Question

I found this article saying OpenJDK uses epoll on linux, but does anybody know if Selector implementations use kqueue, dev/poll etc over traditional polling where available?

score 5 · Accepted Answer · answered Oct 27 '11 at 13:19

5

Yes it does. java.nio.channels.Selector.open() returns different implementations depending on your underlying operating system. Eg. If you are using a JRE from sun/oracle you will get:

Windows 
sun.nio.ch.WindowsSelectorImpl

Mac OS 
sun.nio.ch.KQueueSelectorImpl

Linux 
sun.nio.ch.EPollSelectorImpl

Solaris
sun.nio.ch.PollSelectorImpl

answered Oct 27 '11 at 13:19

Schildmeijer

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Java7 update: That being said: The windows part is pretty slow compared to native IOCP. The windows selector cannot select more than 1024 channels and thus is pretty slow... Use AIO if possible under windows – Kr0e May 21 '14 at 12:05

Do NIO selectors use event notifications by default?

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