[dune-pdelab] Dune::PDELab::ISTLBackend_NOVLP_CG_AMG_SSOR with ALUGrid

[Eike Mueller]

Thanks a lot,

that's very interesting. So far I've only been using the overlapping 
solvers on YaspGrid, but I need to move to ALUGrid for my spherical 
grid, and as far as I know I can only use the non-overlapping solvers 
there as ALUGrid does not have any overlap.

I'll try to set up a simple test case that reproduces the problem. I'm 
using version 2.1 of Dune, so that might explain why it's not working 
for me at the moment.

Eike

Rebecca Neumann wrote:
> Dear Eike,
> yes, a test setup would be nice. (Do you use the dune trunk or the 2.1 
> version? I think until now only the istl trunk supports NOVLP_AMG on 
> ALUGrid.)
> Solving a simple poisson problem with ALUGrid and  NOVLP_BCGS_AMG_SSOR 
> with Q1 works fine.
> But the NOVLP AMG is still very new and not really well tested, and for 
> ALUGrid the convergence rates are still not as good as we would expect it.
> Hopefully I will have time to explore this further in April.
> Best Regards,
> Rebecca
> 
> On 27.01.2012 12:10, Markus Blatt wrote:
>> On Fri, Jan 27, 2012 at 10:17:23AM +0000, Eike Mueller wrote:
>>> Dear dune-/pdelab-list,
>>>
>>> I'm trying to use the non-overlapping ISTL backend
>>> Dune::PDELab::ISTLBackend_NOVLP_CG_AMG_SSOR for solving a problem on
>>> my spherical shell grid, which I implemented with ALUGrid. This
>>> works fine in serial, but if I try to run in parallel I get the
>>> runtime error given below [1]. I have also tried the same backend on
>>> a non-overlapping YaspGrid (just a simple cube), where it works fine
>>> both serially and in parallel. In addition, the ISTL backend
>>> Dune::PDELab::ISTLBackend_NOVLP_CG_SSORk works without problems in
>>> parallel with my ALUGrid implementation.
>>>
>>> Does anyone have any idea what might be going wrong here?
>>
>> This meas that some ghost nodes still carry the unaggregated flag even
>> though the information about the aggregation was communicated.
>>
>> Which probably means that the communication interface was not setup
>> correctly.
>>
>> Please provide a test case and post a bug in the pdelab bug
>> tracker at http://users.dune-project.org/projects/dune-pdelab/issues
>>
>> Thanks!
>>
>> Markus
> 
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