Path: utzoo!attcan!uunet!decwrl!ucbvax!VKPMZB.Physik.Uni-Mainz.DE!BOHN
From: BOHN@VKPMZB.Physik.Uni-Mainz.DE
Newsgroups: comp.sys.transputer
Subject: (none)
Message-ID: <9010091422.AA23544@theory.TN.CORNELL.EDU>
Date: 9 Oct 90 14:04:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 39

Hi Dzaharoudin,

Refering to your questions about the 3L Parallel Fortran Compiler and
the Processor-Farming, I want to suggest two possible solutions:
(I'm not using Fortran, but 3L Parallel C; so it should work the same!)

        1. Is there an C004-Linkswitch on your Transputerboard ?
                If so, the flood-fill-configurer will not work !
                He tries to boot a worker-task into the C004 and destroys
                the link-connection-programming. In this case, you have to
                use the static configurer instead. (If you have more
                questions about how to use the static configurer with
                master, worker and the frouter, please ask again!)

        2. The other possibility is, that your master-task has to do a
                lot of work in comparison with the 4 worker-tasks. That
                means, that 2 worker-tasks have done their work faster than
                the master for every packet. In this case you cannot reach
                a Speed-Up better than approx. 2. You have to check your
                application, to displace the main portion of work
                to the worker-task (Thats the reason why they have their
                name !!!). Have you tried out the 'mandelbrot'-example,
                delivered with the 3L-compiler ??? In this example, you
                should reach a Speed-Up of approx. 4, if point 1. is not
                the problem.

These were my experiences with the 3L-flood-fill-configurer, so I hope this
helps.

Greetings,

Markus

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Markus Bohn
Inst. f. Kernphysik             e-mail:         BOHN@DMZNAT51.bitnet
Univ. Mainz
D-6500 Mainz
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