METIS partition error

[yuesu jin]

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

[David Wells]

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

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[yuesu jin]

Dear David,

 Thank you! It solved the problem.

Best wishes,

Yuesu

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