Dear David,
 Thank you! It solved the problem.
Best wishes,
Yuesu

On Mon, Jul 27, 2020 at 8:48 AM David Wells <drwe...@vt.edu> wrote:

> 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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>>
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>


-- 
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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