Hi Maxi,
I guess I am not the correct person to explain you the reason for that
assert. But what you are doing is that while calling scale you are messing
with the ghost values (which prevents the compress step).
You should do it only locally. What you might want to check it out are the
new `operation_after_loop` functions provided by the cell_loops (on the
master branch), which gives you the information local vector entry has been
finished and you are allowed to apply e.g. the mass matrix diagonal on.
Peter
On Saturday, 18 January 2020 12:57:24 UTC+1, Maxi Miller wrote:
>
> In step-48 the inverse mass matrix is applied by moving the inverse data
> into a vector and applying the function scale(), i.e. as in the following
> code:
> data.cell_loop(&LaplaceOperator::local_apply_cell,
> this,
> dst,
> src,
> true);
> computing_times[0] += timer.wall_time();
> timer.restart();
>
> dst.scale(inv_mass_matrix);
>
>
>
> Now I would like to do the same, but use a cell_loop instead of scale().
> Thus, I created an additional function called
> "local_apply_inverse_mass_matrix" as
> template <int dim, int degree, int n_points_1d>
> void LaplaceOperator<dim, degree, n_points_1d>::
> local_apply_inverse_mass_matrix(
> const MatrixFree<dim, Number> & data,
> LinearAlgebra::distributed::Vector<Number> & dst,
> const LinearAlgebra::distributed::Vector<Number> &src,
> const std::pair<unsigned int, unsigned int> & cell_range)
> const
> {
> (void) data;
> (void) cell_range;
> dst = src;
> dst.scale(inv_mass_matrix);
> }
>
> When running that code, though, using
> LinearAlgebra::distributed::Vector<Number> tmp(src);
>
> data.initialize_dof_vector(tmp);
> data.initialize_dof_vector(dst);
> data.cell_loop(&LaplaceOperator::local_apply_cell,
> this,
> tmp,
> src,
> true);
> computing_times[0] += timer.wall_time();
> timer.restart();
>
> data.cell_loop(&LaplaceOperator::local_apply_inverse_mass_matrix,
> this,
> dst,
> tmp,
> true);
> computing_times[1] += timer.wall_time();
>
> computing_times[3] += 1.;
>
>
> I get the error
> An error occurred in line <3338> of file </opt/dealii/include/deal.II/
> matrix_free/matrix_free.h> in function
> void dealii::internal::VectorDataExchange<dim, Number,
> VectorizedArrayType>::compress_start(unsigned int, VectorType&) [with
> VectorType = dealii::LinearAlgebra::distributed::Vector<double>; typename
> std::enable_if<(dealii::internal::has_compress_start<VectorType>::value &&
> dealii::internal::has_exchange_on_subset<VectorType>::value), VectorType
> >::type* <anonymous> = 0; int dim = 2; Number = double;
> VectorizedArrayType = dealii::VectorizedArray<double, 4>]
> The violated condition was:
> vec.has_ghost_elements() == false
> Additional information:
> You are trying to use functionality in deal.II that is currently not
> implemented. In many cases, this indicates that there simply didn't
> appear much of a need for it, or that the author of the original code did
> not have the time to implement a particular case. If you hit this
> exception, it is therefore worth the time to look into the code to find out
> whether you may be able to implement the missing functionality. If you do,
> please consider providing a patch to the deal.II development sources (see
> the deal.II website on how to contribute).
>
> Stacktrace:
> -----------
> #0 ./MF_FES_RK4-Test: void dealii::internal::VectorDataExchange<2,
> double, dealii::VectorizedArray<double, 4>
> >::compress_start<dealii::LinearAlgebra::distributed::Vector<double,
> dealii::MemorySpace::Host>,
> (dealii::LinearAlgebra::distributed::Vector<double,
> dealii::MemorySpace::Host>*)0>(unsigned int,
> dealii::LinearAlgebra::distributed::Vector<double,
> dealii::MemorySpace::Host>&)
> #1 ./MF_FES_RK4-Test: void dealii::internal::compress_start<2,
> dealii::LinearAlgebra::distributed::Vector<double,
> dealii::MemorySpace::Host>, double, dealii::VectorizedArray<double, 4>,
> (dealii::LinearAlgebra::distributed::Vector<double,
> dealii::MemorySpace::Host>*)0>(dealii::LinearAlgebra::distributed::Vector<double,
>
> dealii::MemorySpace::Host>&, dealii::internal::VectorDataExchange<2,
> double, dealii::VectorizedArray<double, 4> >&, unsigned int)
> #2 ./MF_FES_RK4-Test: dealii::internal::MFWorker<dealii::MatrixFree<2,
> double, dealii::VectorizedArray<double, 4> >,
> dealii::LinearAlgebra::distributed::Vector<double,
> dealii::MemorySpace::Host>,
> dealii::LinearAlgebra::distributed::Vector<double,
> dealii::MemorySpace::Host>, Step40::LaplaceOperator<2, 2, 4>,
> true>::vector_compress_start()
> #3 /opt/dealii/lib/libdeal_II.g.so.9.2.0-pre:
> dealii::internal::MatrixFreeFunctions::MPICommunication::execute()
> #4
>
> /opt/intel/compilers_and_libraries_2019.5.281/linux/tbb/lib/intel64_lin/gcc4.7/libtbb_debug.so.2:
>
>
> #5
>
> /opt/intel/compilers_and_libraries_2019.5.281/linux/tbb/lib/intel64_lin/gcc4.7/libtbb_debug.so.2:
>
>
> #6
>
> /opt/intel/compilers_and_libraries_2019.5.281/linux/tbb/lib/intel64_lin/gcc4.7/libtbb_debug.so.2:
>
>
> #7
>
> /opt/intel/compilers_and_libraries_2019.5.281/linux/tbb/lib/intel64_lin/gcc4.7/libtbb_debug.so.2:
>
>
> #8
>
> /opt/intel/compilers_and_libraries_2019.5.281/linux/tbb/lib/intel64_lin/gcc4.7/libtbb_debug.so.2:
>
>
> #9 /lib64/libpthread.so.0:
> #10 /lib64/libc.so.6: clone
>
> Why that, and how can I fix it?
> Thanks!
>
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