home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!olivea!spool.mu.edu!uwm.edu!caen!sdd.hp.com!swrinde!gatech!mailer.cc.fsu.edu!sun13!well.sf.ca.us
- From: rms@well.sf.ca.us (richard marlon stein)
- Newsgroups: comp.graphics.research
- Subject: Re: Scalability (was Re: comp.graphics.research)
- Message-ID: <11588@sun13.scri.fsu.edu>
- Date: 21 Dec 92 18:17:57 GMT
- References: <11561@sun13.scri.fsu.edu> <11566@sun13.scri.fsu.edu> <11579@sun13.scri.fsu.edu>
- Sender: news@sun13.scri.fsu.edu
- Organization: Whole Earth 'Lectronic Link
- Lines: 47
- Approved: murray@vs6.scri.fsu.edu
- X-Submissions-To: graphics@scri1.scri.fsu.edu
- X-Administrivia-To: graphics-request@scri1.scri.fsu.edu
-
- In article <11579@sun13.scri.fsu.edu> leech@cs.unc.edu (Jon Leech) writes:
- <
- <In article <11566@sun13.scri.fsu.edu>, rms@well.sf.ca.us (richard marlon stein) writes:
- <|> Try muxing the outputs from 1000 framebuffers into a single analog stream.
- <|> I would rather pass on this approach. The PixelFlow box captures the output
- <|> from a composition network rated at 4 Gbytes/s into a single frambeubffer.
- <|>
- <|> I don't believe this approach is truly scalable either, since its still
- <|> an example of the N to 1 mux problem. So it is, in my opinion, contention
- <|> limited (the laws of physics won't cooperate and provide infinite digital
- <|> bus or network bandwidth).
- <
- < PixelFlow should be extremely scalable. The composition network
- <has fixed bandwidth no matter how many renderers are used, and latency
- <due to the length of the composition network increases very slowly as
- <additional rendering boards are added.
- <
- < If you're referring to some other aspect, please explain in more
- <detail.
- <
- <|> I advocate a tessellated display approach myself, where each tessellation
- <|> element owns a processor, framebuffer, and display. The trick is to coordinate
- <|> the system temporally. The scalable concurrent visualization system trades
- <|> contention for asynchronous execution.
- <
- < If you mean that each processor is responsible for a fixed screen
- <area, this approach wastes most of the processors when looking at
- <something far away. It also trades off moving pixels for moving
- <primitives, and moving primitives is definitely not scalable.
- <Pixel-Planes 5 uses a considerably more complex variant of this
- <decomposition and partly addresses these concerns.
- <--
- < Jon Leech (leech@cs.unc.edu) __@/
-
- I would like to PixelPlanes hammer on a 1 Terabyte dataset. One things for sure
- though, I know when I've been beat. Since the SCVS does not "subdivide" the
- screen by assigning processors to a specific region of a single display surface,
- I don't think you are in a position to judge the architecture. Ask Molnar if
- he'll sign the non-disclosure agreement, and then you can judge.
- --rick
- --
- Richard Marlon Stein, Internet: rms@well.sf.ca.us
- To those who know what is not known; The Chronicles of Microwave Jim!
-
- --
- Moderated by SCRI Vis <> Submissions to: graphics@scri1.scri.fsu.edu
- Guy, John R. Murray <> Administrivia to: graphics-request@scri1.scri.fsu.edu
-