From: Lars Rzymianowicz <larsrzy@ti.uni-mannheim.de>
Newsgroups: comp.parallel.mpi
Subject: Re: Benefiting From MPI
Date: Fri, 18 Jun 1999 09:24:40 +0200
Organization: Dept. of Computer Engineering, University of Mannheim, Germany
Message-Id: <3769F438.B98EEA4F@ti.uni-mannheim.de>
References: <37695e53@dce2.ucc.uconn.edu>
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Xref: ukc comp.parallel.mpi:5223


"S. Streeseman" wrote:
> I just started using MPICH and had great success with all the examples at
> the Argonne site.  I run lengthy (10hrs to 2 days on DEC)optimization
> routines but I see no major improvement in speed.
> How important are the MPI subroutines?
> If I don't add any do I still benefit from the parallel processing?

Hi Scott,
you should give us a bit more info on your application and its
parallel implementation

- How many processes do you start on how many machines?
- How often do they communicate?
- What is the typical mesage size?
- Are you using (non-)blocking communication?
- Have you analyzed the app with (n)upshot or jumpshot?

Lars
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