Unique Problem with OpenseesMP

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shawnfa
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Joined: Thu Oct 10, 2013 7:48 pm

Unique Problem with OpenseesMP

Post by shawnfa » Thu Oct 10, 2013 8:04 pm

Hi everyone,

I've been trying to use OpenseesMP to analyze two different time history records simultaneously on one model.

It appears to run correctly, and I get an "Analysis (1) completed" and "Analysis(2) completed", but when I look at the output, both analyses have the exact same output. This output is not equal to either model if I run them sequentially. Also, if the time histories have a different number of steps OpenseesMP completely stops when the first completes. So clearly the analyses are not being solved in parallel and something is going very wrong.

I've tried using the -par command as well as using the additional commands and a "foreach" loop as described in the "Using the OpenSees Interpreter on Parallel Computers" document by Frank McKenna and Gregory L. Fenves, and neither work. I have also never heard of anyone having a problem like this. MPICH2 appears to works fine, as does OpenseesSP.

Any help or ideas would be greatly appreciated.

fmk
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Re: Unique Problem with OpenseesMP

Post by fmk » Fri Oct 11, 2013 7:57 am

what solver and numberer are you using.

shawnfa
Posts: 3
Joined: Thu Oct 10, 2013 7:48 pm

Re: Unique Problem with OpenseesMP

Post by shawnfa » Sat Oct 12, 2013 11:23 am

I'm using the Mumps solver and ParallelRCM numberer.

However I have tried others with no luck.

fmk
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Re: Unique Problem with OpenseesMP

Post by fmk » Mon Oct 14, 2013 10:49 am

you don't want a parallel solver and numberer .. it treats the 2 seperate models as one model .. you want to keep the analysis and models seperate .. use the same system and solver that you would use in the case of a sequential script.

shawnfa
Posts: 3
Joined: Thu Oct 10, 2013 7:48 pm

Re: Unique Problem with OpenseesMP

Post by shawnfa » Mon Oct 14, 2013 12:31 pm

That was the problem.

Thank you very much!

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