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Re: Parallel Kit Question: ParallelDot is much more slow than Dot

• To: mathgroup at smc.vnet.net
• Subject: [mg40484] Re: Parallel Kit Question: ParallelDot is much more slow than Dot
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Mon, 7 Apr 2003 04:56:24 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <b6gn64$ckk$1@smc.vnet.net> <b6j8ev$5vc$1@smc.vnet.net> <b6lvif$edt$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

I usual use MPI on a Cray or on a SGI cluster.
It is a bit strange to use a interpreter like Mathematica
for high performance computing ...

Regards
  Jens

nafod40 wrote:
> 
> Jens-Peer Kuska wrote:
> > Hi,
> >
> > parallel commands are usualy slower than serial ones,
> > because you have the overhead for process communication.
> 
> Have you used the Parallel Toolkit? My experience shows there are some
> gross inefficiencies in their implementation of the ParallelMap[ ]
> functions.
> 
> In general, the toolkit is useful if you can decompose your problem
> coarsely. Don't use the ParallelMap[ ] function or similar, develop yuor
> own analogs based on RemoteEvaluate[ ].

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  • Re: Re: Parallel Kit Question: ParallelDot is much more slow than Dot
    • From: Dr Bob <majort@cox-internet.com>