Parallel computing in version 7 Vs version 8
- To: mathgroup at smc.vnet.net
- Subject: [mg129402] Parallel computing in version 7 Vs version 8
- From: Jonathan Frazer <J.Frazer at sussex.ac.uk>
- Date: Thu, 10 Jan 2013 21:42:37 -0500 (EST)
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- Delivered-to: l-mathgroup@wolfram.com
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Hi All, I'm trying to modify a fairly large chunk of code so that I can make use of the parallel computing capabilities. There are many many things that are confusing me but the first problem I have is the following. If I have something like SetSharedVariable[pri] pri = {}; maybeprime = i; j = 1; k = 500; ParallelDo[ If[PrimeQ[maybeprime], AppendTo[pri, {i, maybeprime}]; Print[i]] , {i, j, k}] pri Length[pri] This appears to work in version 8 but not 7. To make it work in 7 I need to use DistributeDefinitions[maybeprime]. This is fine except that in the code I am interested in modifying I have hundreds of definitions. Do I really need to go through the entire thing and explicitly list every single definition in the form DistributeDefinitions[def1, def2, ..., def100] since I have to use version 7? Many thanks in advance, Jonny