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Old 2007-02-07, 08:10   #1
DonaldTripp
 

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Lightbulb Parallel Prime Search

Does anyone have a parallel prime search written in MPI? Our cluster is being under utilized, so I thought I'd throw a couple hundred thousand hours at something worthwhile.

dtripp@hawaii.edu
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Old 2007-02-17, 17:10   #2
BotXXX
 
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Quote:
Originally Posted by DonaldTripp View Post
Does anyone have a parallel prime search written in MPI? Our cluster is being under utilized, so I thought I'd throw a couple hundred thousand hours at something worthwhile.
Not sure if it is compatible with MPI but to verify finds of Mersenne primes usually a few people 'donate' time on quite large machines to have a fast double check. They use Glucas incombination with PThreads.
Not sure if it might help you in your case.

Glucas -> http://www.oxixares.com/glucas/
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Old 2007-02-17, 19:35   #3
ewmayer
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Donald, none of the LL testing codes is parallelized to a very large degree, and even the ones that are suffer a penalty when running on multiple CPUs, so the best way for you to contribute bandwidth is to run one copy of whatever client is best for your setup (Prime95 for x86-ish, Glucas or Mlucas for anything else) on each available CPU.

I realize setting that up may require more overhead than you feel like putting in.

Cheers,
-Ernst
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