Date: Wed, 24 Sep 2008 13:38:11 -0700 From: Julian Elischer <julian@elischer.org> To: "Bruce M. Simpson" <bms@FreeBSD.org> Cc: freebsd-net@freebsd.org, Mungyung Ryu <rumuru@gmail.com> Subject: Re: ACE on FreeBSD? Message-ID: <48DAA533.3080607@elischer.org> In-Reply-To: <48DAA4BB.7080907@elischer.org> References: <e465331f0809231512s444afacdk597878ac0692260c@mail.gmail.com> <48DA5204.3030803@FreeBSD.org> <48DAA4BB.7080907@elischer.org>
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Julian Elischer wrote: > Bruce M. Simpson wrote: >> Hi, >> >> I looked at ACE years and years ago (~1997) when Doug Schmidt was >> first promoting the ideas behind it. The whole Reactor/Proactor split >> pretty much hangs on the event dispatch which your particular OS >> supports. >> >> The key observation is whether your target OS implements events in an >> edge-triggered or level-triggered way; I am borrowing definitions from >> electronic engineering here. >> >> You could do a straight port with Proactor, but performance will >> probably suck, because both FreeBSD (and Linux, I believe) need to >> emulate POSIX asynchronous I/O operations. >> >> Reactor will generally "fare better" on UNIX derived systems such as >> FreeBSD and Linux, because its event handling primitives are geared >> towards the level-triggered facilities provided by select(). > > A true FreeBSD port would use kevent with AIO. > At Cisco/ironport we use AIO with the build in kevent trigering to > great effect. Certainly for sockets it works VERY well. sorry I meant for sockets and raw devices.. (what we use them for) sockets don't need AIO to work well with kevent but raw devices do. Luckily it works as advertised. > >> >> In Windows, Winsock events use asynchronous notifications which may be >> tied to Win32 EVENT objects, and the usual Kernel32.DLL thread >> primitives are used around this. This makes Proactor more appropriate >> in that environment. >> >> XORP does some similar stuff to ACE under the hood to support the >> native socket facilities of both Windows and FreeBSD/Linux. It's >> hybridized but it behaves more like Reactor because we run in a single >> thread, and you have to force Winsock's helper thread to run, by >> preempting you, using some file handle and socket tricks. >> >> I don't currently know about stability of ACE on FreeBSD. >> >> cheers >> BMS >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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