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:
--------------------------------------------------------
An error occurred in line <565> of file </home/roland/Downloads/dealii/
source/lac/trilinos_vector.cc> in function
void dealii::TrilinosWrappers::MPI::Vector::compress(dealii::
VectorOperation::values)
The violated condition was:
result.max-result.min<1e-5
Additional information:
Not all processors agree whether the last operation on this vector was
an addition or a set operation. This will prevent the compress() operation
from succeeding.
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::Vector local_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? The program
runs (more or less fine) when compiling in release mode.
Thanks!
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