Article View: comp.arch
Article #2808Re: Shared Memory vs. Distributed Systems
From: Michael A. Pasek
Date: Tue, 24 Oct 1989 14:16
Date: Tue, 24 Oct 1989 14:16
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1691 bytes
In article <20764@usc.edu> vorbrueg@bufo.usc.edu (Jan Vorbrueggen) writes (in
response to article <36597@lll-winken.LLNL.GOV> brooks@maddog.llnl.gov (Eugene Brooks):
>Eugene, ever seen a transputer? Overhead for receiving or sending a
>message is 19 cycles (630 ns for a 30 MHz part). The actual transfer
>is done by a dedicated DMA machine at a maximum rate of 1.7 Mbyte/s
^^^^^^^^^^^^^^^^^^^^^
Although you describe this as "message passing" between the computers,
it sounds to me like you have one "global" memory which is controlled by the
"dedicated DMA machine", and this memory is "shared" by all the "local"
processors. What difference does it make whether you set some register in
your "dedicated DMA machine" and tell it to move some data to another
location, or just set an address latch in your micro somewhere and do a
"store" instruction ?
M. A. Pasek Switching Software Development NCR Comten, Inc.
(612) 638-7668 CNG Development 2700 N. Snelling Ave.
pasek@c10sd3.StPaul.NCR.COM Roseville, MN 55113
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!ginosko!brutus.cs.uiuc.edu!lll-winken!uunet!ncrlnk!ncrcce!pasekReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!ginosko!brutus.cs.uiuc.edu!lll-winken!uunet!ncrlnk!ncrcce!pasek From: pasek@ncrcce.StPaul.NCR.COM (Michael A. Pasek) Newsgroups: comp.arch Subject: Re: Shared Memory vs. Distributed Systems Summary: Sounds like Shared Memory to me.... Keywords: Shared, distributed, message Message-ID: <1646@ncrcce.StPaul.NCR.COM> Date: 24 Oct 89 14:16:10 GMT References: <20764@usc.edu> Reply-To: pasek@c10sd3.StPaul.NCR.COM (M. A. Pasek) Followup-To: comp.arch Organization: NCR Comten, Inc. Lines: 18