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MathGroup Archive 2001

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Re: Want to use results by Parallel Computing

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26996] Re: Want to use results by Parallel Computing
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 30 Jan 2001 23:22:17 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <9563bt$9f@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

ParallelEvaluate[Do[c[i] = i * (i+2), {i, 1000}]]

set the definitions for c[] up on several machines.

and

ParallelEvaluate[Do[c[i], {i, 1000}]]

will pass the values of the function definitions back
to the master machine.

Regards
  Jens
> 
> 

"Toshiyuki (Toshi) Meshii" wrote:
> 
> Hello,
> 
> Some strange things about parallel computing.
> 
> When I execute the following on a single machine, there is no problem.
> 
> Do[c[i] = i * (i+2), {i, 1000}]
> 
> I can surely obtain c[5] or any of the elements.
> 
> c[5]
> 35
> 
> However, when I do the same thing by ParallelEvaluate,  executing time
> becomes shorter, but I cannot access to the results.
> 
> ParallelEvaluate[Do[c[i] = i * (i+2), {i, 1000}]]
> 
> That is, I cannot get the concrete value of c[5] on the master machine.
> 
> c[5]
> c[5]
> 
> Mathematica just returns c[5] symbolically.
> 
> What is happening?
> I hope some one can give me advice on obtaining the results, such as
> c[5]=35.
> 
> -Toshi


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