It might also be that you are forgetting to compress() your vector
after you assemble it. The error would then trigger on the next
operation, which is the set_zero() in this case. What is the last
thing you have been doing with this vector?

On Tue, Oct 10, 2017 at 9:18 AM, Wolfgang Bangerth
<bange...@colostate.edu> wrote:
> On 10/10/2017 05:15 AM, 'Maxi Miller' via deal.II User Group wrote:
>>
>>
>> When trying to run my program on an i7-CPU with 4/8 threads, I get the
>> following error when calling set_zero() from the ConstraintMatrix-class:
>> |
>> --------------------------------------------------------
>> Anerror occurred inline <565>of file
>> </home/roland/Downloads/dealii/source/lac/trilinos_vector.cc>infunction
>>
>> voiddealii::TrilinosWrappers::MPI::Vector::compress(dealii::VectorOperation::values)
>> Theviolated condition was:
>>      result.max-result.min<1e-5
>> Additionalinformation:
>> Notall processors agree whether the lastoperation on thisvector was an
>> addition ora setoperation.Thiswill prevent the compress()operation
>> fromsucceeding.
>>
>> Stacktrace:
>> -----------
>> #0  /opt/dealII/lib/libdeal_II.g.so.9.0.0-pre:
>> dealii::TrilinosWrappers::MPI::Vector::compress(dealii::VectorOperation::values)
>> #1  /opt/dealII/lib/libdeal_II.g.so.9.0.0-pre:
>> #2  /opt/dealII/lib/libdeal_II.g.so.9.0.0-pre: void
>> dealii::ConstraintMatrix::set_zero<dealii::TrilinosWrappers::MPI::Vector>(dealii::TrilinosWrappers::MPI::Vector&)
>> const
>> #3  main: MinimalSurfaceProblem<2>::compute_residual(double, double,
>> double)
>> #4  main: MinimalSurfaceProblem<2>::run()
>> #5  main: main
>> --------------------------------------------------------
>> |
>>
>> The code where this line arises is
>> |
>>
>> LinearAlgebraTrilinos::MPI::Vectorlocal_residual(dof_handler.locally_owned_dofs(),mpi_communicator);
>> //Code in between for setting values
>>
>> hanging_node_constraints.set_zero(local_residual);
>>
>> |
>>
>>
>> It only happens if running with more than 4 threads, i.e. with mpirun -n 5
>> or larger. What is the problem here, and how can I fix that?
>
> That would sound like a bug somewhere. Can you create a small program that
> demonstrates this and that you could share so that others could look at it?
> It doesn't have to do anything useful, just demonstrate the problem. For
> example, you could start from your existing program and strip assembly and
> solver from it.
>
> Best
>  W.
>
>
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth          email:                 bange...@colostate.edu
>                            www:
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-- 
Timo Heister
http://www.math.clemson.edu/~heister/

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