Date: Wed, 24 Sep 2008 13:36:11 -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: <48DAA4BB.7080907@elischer.org> In-Reply-To: <48DA5204.3030803@FreeBSD.org> References: <e465331f0809231512s444afacdk597878ac0692260c@mail.gmail.com> <48DA5204.3030803@FreeBSD.org>
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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. > > 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"
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