Date: Mon, 23 Sep 1996 13:59:44 -0400 (EDT) From: "Ron G. Minnich" <rminnich@Sarnoff.COM> To: Chuck Robey <chuckr@glue.umd.edu> Cc: freebsd-hackers@FreeBSD.org Subject: Re: user-level distributed shared memory available for freebsd Message-ID: <Pine.SUN.3.91.960923134125.17698J-100000@terra> In-Reply-To: <Pine.OSF.3.95.960919223020.8591G-100000@skipper.eng.umd.edu>
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On Thu, 19 Sep 1996, Chuck Robey wrote: > On Mon, 16 Sep 1996, Ron G. Minnich wrote: > > > This system is called ZOUNDS. it's all user mode, no special sysadmin > > bugs to me, of course. > Ron, where is this? ftp://ftp.sarnoff.com/pub/mnfs/www/docs/cluster.html Look down the page, it's in the free software section (I hope). > I don't know if you have the time to pander to my curiosity on one point, > but I'm sure you know the anser to this (if you're not too busy). I know > unix in general has never had a really good file locking system. Why > doesn't someone write one just for FreeBSD? well, 1) I don't really do file locking, I use memory-variable locking, i.e. test-and-set stuff. That's in MNFS, the previous system, which I'm currently working to put into openbsd. 2) ZOUNDS is based on the one-writer model, as is the DEC memory-channel. The locking in ZOUNDS will not be based on the test-and-set model. I have not looked at FreeBSD locking, but I thought it worked ok on ufs? What's missing? NFS locking, now, that's another kettle of fish. ron
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