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- Newsgroups: comp.parallel
- Path: sparky!uunet!gatech!hubcap!fpst
- From: Patrick Surry <pds@epcc.edinburgh.ac.uk>
- Subject: Re: Synchonizing watches
- Message-ID: <1992Sep4.140849.25589@hubcap.clemson.edu>
- Sender: nnews@dcs.ed.ac.uk
- Organization: Edinburgh Parallel Computing Centre
- References: <1992Sep3.123226.14205@hubcap.clemson.edu> <1992Sep3.201927.25562@hubcap.clemson.edu>
- Date: 4 Sep 92 14:00:21 GMT
- Approved: parallel@hubcap.clemson.edu
- Lines: 25
-
-
- > Unless I'm missing something, this is fairly straightforward.
- >
- > 1) A zeroes watch, calls B and hangs up.
- B hears ring at t=AB.
- > 2) B waits till phone ends ringing then calls A and hangs up.
- B calls at t=AB. A hears phone at t=AB+BA (so A knows AB+BA)
- > 3) B calls A again and hangs up.
-
- What does this mean? Does B call back again at t=AB (that doesn't make
- sense) or are you assuming that B can instantaneously "hear" the ring
- from A's end at the first call and so calls A at t=AB+BA ringing at
- A's end at AB+2BA? I think this is where this method comes apart.
-
- Patrick
-
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- Engineers think that theory approximates reality | Mathematicians never
- Physicists think that reality approximates theory | make the connection
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- Patrick Surry, JCMB 2254, Edinburgh, Scotland e||) Edinburgh Parallel
- EMail: pds@epcc.ed.ac.uk Tel: (031) 650-5960 c||c Computing Centre
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