Re: Glossary of Parallel Computing Terms

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1 total messages Started by Thilo Kielmann Tue, 15 Sep 1992 15:19

#352

Author: Thilo Kielmann
Date: Tue, 15 Sep 1992 15:19

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In article <1992Sep14.122934.16072@hubcap.clemson.edu>, Greg Wilson <gvw@epcc.edinburgh.ac.uk> writes:
> 
> The second version of a glossary of parallel computing terms is now
> available by anonymous ftp from:
> 
> 	ftp.epcc.ed.ac.uk:pub/personal/gvw/glossary.ps.Z.uu
> 

First of all: Thank you very much for this piece of work!

Second: A question to your definition of the "parallel balance point".

You define the time T taken to perform some calculation of size N on P
processors as:

         T = fx(N,P) - fc(N,P)

where the execution time function fx is a decreasing function of P,
while the coordination time function fc is an increasing function of P.

I worry about the subtraction of these 2 functions. Isn't it necessary
to perform both execution _and_ coordination? So, why not add fx and fc?

Is it just a typo, or am I wrong?

Thilo Kielmann   (kielmann@isa.informatik.th-darmstadt.de)

Dept. of Computer Science (FB 20)
University of Darmstadt
Germany

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