I started to introduced a BIO based UDP server. I moved around a lot of code. Julien Vermillard :::: http://people.apache.org/~jvermillard/
On Fri, May 24, 2013 at 8:54 PM, Julien Vermillard <[email protected]> wrote: > I'll try to do a bio based UDP server from what I already have. > Thanks for the feedback. > > Le 24 mai 2013 17:21, "Emmanuel Lécharny" <[email protected]> a écrit : > >> Le 5/24/13 4:53 PM, Julien Vermillard a écrit : >> > Hi, >> > I just conducted some NIO vs BIO on UDP server. >> > >> > For a UDP server you need only one socket, not like for TCP (with >> > spawn anew socket for each client session). >> > >> > So if you try to detect I/O events with NIO select(); on your only one >> > socket you pay a hugr price for detecting events. >> > >> > With the MINA 3 CoAP codec, I managed to have 20k msg/sec on my laptop >> > (mina or netty NIO) but with a basic BIO client/server implementation >> > it jumped to 100k msg/sec (with both client and server on my laptop). >> >> Crystal clear : select() is a huge penalty to pay when using a >> DatagramChannel. >> >> I asn't expecting teh gap to be that huge though... >> > >> > >> > I start to think a NIO based UDP server is pointless and we should not >> > try to provide one, but a good BIO based one. >> >> We do need a decent BIO implementation for both UDP *and* TCP. My >> understanding is that TCP over BIO will be 30% faster than over NIO, the >> only valid reason to use NIO is when you have tens of thousands >> connected users (well, you don't want to spawn as many threads as you >> have conected users, don't you ?) >> >> So bottom line, it's probably a good idea to provide a BIO based >> transport for TCP and UDP. >> >> The question you raise is pretty much : should the user *know* if it's >> using NIO or BIO ? I'm not convinced it's a valid concern for the user, >> and I do think we can safely make a choice for him (through some >> configuration, like we default to BIO for both TCP and UDP, unless the >> user explicitely requests to use NIO). >> >> Does it sounds sane ? >> >> -- >> Regards, >> Cordialement, >> Emmanuel Lécharny >> www.iktek.com >> >
