From: -ezanee- <mer296@soton.ac.uk>
Newsgroups: comp.parallel.mpi
Subject: Re: speedup
Date: Sun, 04 Apr 1999 11:31:41 +0100
Organization: Electronics and Computer Science, University of Southampton
Message-Id: <37073F8C.19D0B011@soton.ac.uk>
References: <36FA679A.DBCE9106@ecs.soton.ac.uk>
    <7do8d6$hko$1@infosun2.rus.uni-stuttgart.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Xref: ukc comp.parallel.mpi:4878


Michael Resch wrote:

> mohd ezanee rusli (mer296@ecs.soton.ac.uk) wrote:
> : parallel version should be less than sequential. However, from my
> : observation it is not that way. what I see is the execution time for P
> : processor is more than sequential. Therefore the speedup will decrease
> : instead of increase.
> : Any idea why?
>
> could you say a few words about the parallel hardware you are running on and
> about the software you are using? this would probably help to find the
> problem.
>
> michael (MiR)

I'm running on several processors connected on 100Mb Ethernet connection and I'm
using MPI for parallelising the program.