Hi Yuesu,
Essentially, yes. If you look at the code for partition_triangulation you
will find
// check for an easy return
if (n_partitions == 1)
{
for (const auto &cell : triangulation.active_cell_iterators())
cell->set_subdomain_id(0);
return;
}
Hence step-17 only tries to use metis (and, if metis is not available,
aborts) if there are multiple partitions for the mesh.
Best,
David
On Mon, Jul 27, 2020 at 12:37 AM yuesu jin <jinyues...@gmail.com> wrote:
> Dear all,
> I am running step-17 by mpirun, it returns the error message below:
> ******************************************
> ----------------------------------------------------
> Exception on processing:
>
> --------------------------------------------------------
> An error occurred in line <69> of file
> </home/yjin6/Deal.II/dealii-9.2.0/source/lac/sparsity_tools.cc> in function
> void dealii::SparsityTools::{anonymous}::partition_metis(const
> dealii::SparsityPattern&, const std::vector<unsigned int>&, unsigned int,
> std::vector<unsigned int>&)
> The violated condition was:
> false
> Additional information:
> The function you called requires METIS, but you did not configure
> deal.II with METIS.
> --------------------------------------------------------
> This message does't appear when I use a single node to run it. Does the
> sparsity tools automatically overload to partition_metis under parallel
> case?
> Thank you!
> Best regards
> --
> Yuesu Jin,
> Ph.D student,
> University of Houston,
> College of Natural Sciences and Mathematics,
> Department of Earth and Atmospheric Sciences,
> Houston, Texas 77204-5008
> 346-404-2062
>
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