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- Xref: sparky comp.unix.wizards:5620 comp.os.misc:1055
- Newsgroups: comp.unix.wizards,comp.os.misc
- Path: sparky!uunet!super!rminnich
- From: rminnich@super.org (Ronald G Minnich)
- Subject: Re: Distributed Shared Memory
- Message-ID: <1993Jan23.000222.1391@super.org>
- Sender: news@super.org (USENET News System)
- Nntp-Posting-Host: super
- Organization: Supercomputing Research Center (Bowie, MD)
- References: <1993Jan22.160108.19344@exlog.com> <PETE.93Jan22130421@medea.rice.edu>
- Date: Sat, 23 Jan 1993 00:02:22 GMT
- Lines: 37
-
- mcdowell@exlogcorp.exlog.com (Steve McDowell) says:
- > I'm looking for pointers to work that's been done in the
- > area of transparent distributed shared memory for UNIX
- > systems. I am only aware of the "mether" system. Is there
- > anything else?
-
- Well, last year we took the Mether model and used it
- as a guide to change the way
- NFS deals with mapped files. We call the result MNFS (for Mether-NFS).
- It works like NFS
- in most ways (save the way in which memory-mapped files work, for
- which a couple of things such as global ordering of writes apply)
- and runs as NFS V3. There is a paper in HPDC-1 which makes an oblique
- reference to it. On Suns it runs as a loadable module, so you don't
- have to rebuild your kernel.
- We have an automounter that mounts MNFS, not NFS, when needed.
-
- We're working out distribution details with Sun now.
-
- It's pretty fast ... we also made some changes to NFS where it would
- buy performance. We have a paper in the works, so I can't really give
- out much written material on it yet.
-
- But we have run shared-memory programs from Crays on both Mether and
- MNFS on a cluster of SPARCStations we have here.
- It works.
-
- Mether source is still available for the asking, as well.
- It has been distributed to a fair number of places at this point.
- But development here halted about ten months ago. MNFS is a nicer path.
-
- Next step after MNFS, of course, is a hardware cut. That's in the works.
- ron
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