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Article #674

Re: Mixed C40/transputer networks & 3L Parallel C

#674
From: & Stevens
Date: Wed, 19 Aug 1992 20:39
31 lines
1652 bytes
Just thought I would add my two pence worth to debate.

  Since 3L Parallel(ha ha) C never did support fine grained
parallelism I guess it doesn't matter too much what you run it on.
Transputer, C40, even 680x0 using semaphores and shared memory: it
would all be much the same. At least Inmos just call a C with a
process library "ANSI C" and make no claims for its parallel nature.

  Never having used a C40 (this being comp.sys.transputer) the
following questions come to mind.

1. Its a newer chip then a T8 and clearly faster, but it an actual
multiprocessing system do you get more bang per buck?

2. Is the architecture up to the job? Context switch time is just as
important as comunications speed. To get the much sort after linear
increase in performace

	Performance	|   /
			|  /
			| /
			|/
			|--------
				No of processors
each processor must be able to fill up all its available time. To do
this it must be able to quickly do something else while it waits for
other processors i.e. Context switch

--
Michael Stevens, Robotics Research Group,Dept of Engineering Science,Oxford,UK
INTERNET: michael@robots.oxford.ac.uk
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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!ox-prg!michael
From: michael@uk.ac.oxford.robots (& Stevens)
Newsgroups: comp.sys.transputer
Subject: Re: Mixed C40/transputer networks & 3L Parallel C
Message-ID: <MICHAEL.92Aug19213930@lucrece.uk.ac.oxford>
Date: 19 Aug 92 20:39:30 GMT
References: <2a9282d0@ThreeL.co.uk>
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Organization: Dept. Engineering Science, Oxford University, UK
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In-reply-to: adc@threel.co.uk's message of 19 Aug 92 16:20:16 GMT