Re: [deal.II] Re: Mean value of component of TrilinosWrappers::MPI::BlockVector

[Konrad Simon]

> That looks like an unrelated error. Can you create a small testcase for 
> this 
> issue here? 
>

I will try to come up with an example. 

Thank you again and best regards,
Konrad

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Re: [deal.II] Re: Mean value of component of TrilinosWrappers::MPI::BlockVector

[Wolfgang Bangerth]

On 1/11/21 5:18 AM, Konrad Simon wrote:


which is thrown in AffineConstraints::add_line 
 
(see the second assert in line 1826) after being called by 
make_hanging_node_constraints. It seems that deal.ii is trying to setup 
constraints on dofs that are not owned by the MPI process.


That looks like an unrelated error. Can you create a small testcase for this 
issue here?


Best
 W.

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Wolfgang Bangerth  email: bange...@colostate.edu
   www: http://www.math.colostate.edu/~bangerth/

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[deal.II] Re: Mean value of component of TrilinosWrappers::MPI::BlockVector

[Konrad Simon]

I am pretty sure that this is related to the following problem:

When I try to run AMR with this FESystem (Nedelec-RaviartThomas-DGQ) with 
more than one MPI rank I get this error

"An error occurred in line <1626> of file 
 
in function 
   void 
dealii::AffineConstraints::add_line(dealii::AffineConstraints::size_type)
 
[with number = double; dealii::AffineConstraints::size_type
= unsigned int] 
The violated condition was:  
   line_n != numbers::invalid_size_type 
Additional information:  
   This exception -- which is used in many places in the library -- usually 
indicates that some condition which the author of the code thought must be 
satisfied at a
certain point in an algorithm, is not fulfilled. An example would be that 
the first part of an algorithm sorts elements of an array in ascending 
order, and a second 
part of the algorithm later encounters an element that is not larger than 
the previous one. 

There is usually not very much you can do if you encounter such an 
exception since it indicates an error in deal.II, not in your own program. 
Try to come up with the 
smallest possible program that still demonstrates the error and contact the 
deal.II mailing lists with it to obtain help.
"

which is thrown in AffineConstraints::add_line 

 
(see the second assert in line 1826) after being called by 
make_hanging_node_constraints. It seems that deal.ii is trying to setup 
constraints on dofs that are not owned by the MPI process.

I read a little bit in the discussions referring to Nedelec and refinement 
- seems a difficult issue. Did anyone run into this, too?

Best,
Konrad

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