[CIG-SHORT] Parallel computing problem

[Charles Williams]

Attached is the run log when I try it on 2 procs.

Charles

p.s.  By the way, the nonlinear solution isn't converging anyway when I run it on 1 proc.  I haven't looked at the problem setup yet.



On 23/05/2012, at 3:47 PM, Matthew Knepley wrote:

> On Tue, May 22, 2012 at 11:44 PM, Charles Williams <willic3 at gmail.com> wrote:
> What version of PyLith are you running?  I'm running the prerelease version of 1.7 and I also get a problem when I try running on more than 1 node in examples/3d/hex8; however, the problem seems to go away when I try a different linear solution option.  Try using the attached .cfg file and see if things improve.  For your particular problem, I get a different issue when running in parallel (HDF5 error).  I'm not sure what the problem might be, but we'll have a look.
> 
> Can someone post the error?
> 
>   Thanks,
> 
>      Matt
>  
> Cheers,
> Charles
> 
> [see attached file: pc_fieldsplit_mult_separate.cfg]
> 
> On 23/05/2012, at 1:36 PM, Romain Jolivet wrote:
> 
>> Hi, 
>> 
>> I have a problem running pylith on multiple nodes. 
>> 
>> My model is based on an elastic medium with a fault in it. When I use the FaultCohesiveKin property and impose the displacement, everything is fine.
>> However, when I use the FaultCohesiveDyn property, with StaticFriction, it starts getting messy. My files are attached.
>> I run:
>> pylith step01.cfg
>> and the run is fine
>> If I run
>> pylith --nodes=10 step01.cfg
>> it crashes at the first time step. I tried with nodes=2 to nodes=12 (the number of cores on my machine) and I had the same result. The error message comes from petsc.
>> 
>> I went into the pylith examples to find a similar, but simpler, problem. In example/3d/hex8/, I tried to run step10.cfg:
>> with one node, it is fine:
>> pyltih step10.cfg
>> However, when you ask for several nodes (more than 2), it crashes:
>> pylith --nodes=3 step10.cfg
>> with 2 nodes, it seems to be fine, but you have a petsc error message at the end.
>> 
>> I someone has an idea on this....
>> Thank you
>> Romain
>> 
>> <TestRomain.tgz>
>> 
>> 
>> 
>> Romain Jolivet
>> Postdoctoral Scholar
>> Geological and Planetary Sciences
>> California Institute of Technology, Pasadena, CA 
>> rjolivet at caltech.edu
>> +1 (626) 560 6356
>> 
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> 
> Charles A. Williams
> Scientist
> GNS Science
> 1 Fairway Drive, Avalon
> PO Box 30368
> Lower Hutt  5040
> New Zealand
> ph (office): 0064-4570-4566
> fax (office): 0064-4570-4600
> C.Williams at gns.cri.nz
> 
> 
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> 
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener

Charles A. Williams
Scientist
GNS Science
1 Fairway Drive, Avalon
PO Box 30368
Lower Hutt  5040
New Zealand
ph (office): 0064-4570-4566
fax (office): 0064-4570-4600
C.Williams at gns.cri.nz

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