[petsc-users] Regarding Issue with Metis Double Precision

[s.pradeep kumar]

Thanks! Resolved my issue. Parmetis works just fine now!

On Sun, May 28, 2023 at 8:57 PM Barry Smith <bsmith at petsc.dev> wrote:

>
>  You must have forgotten the --download-metis  in your latest configure
> command line.
>
>
> On May 28, 2023, at 9:26 PM, s.pradeep kumar <spradeepmahadeek at gmail.com>
> wrote:
>
> Thanks! I tried adding the flag but it throws in the following error:
>
>
> =============================================================================================
>                          Configuring PETSc to compile on your system
>
> =============================================================================================
> TESTING: configureExternalPackagesDir from
> config.framework(config/BuildSystem/config/framework.py:1070)
>
> *********************************************************************************************
>            UNABLE to CONFIGURE with GIVEN OPTIONS (see configure.log for
> details):
>
> ---------------------------------------------------------------------------------------------
>   Package parmetis requested but dependency metis not requested.
>   Perhaps you want --download-metis or --with-metis-dir=directory or
>   --with-metis-lib=libraries and --with-metis-include=directory
>
> *********************************************************************************************
>
> On Sun, May 28, 2023 at 8:12 PM Barry Smith <bsmith at petsc.dev> wrote:
>
>>
>>   It looks you are calling Metis routines directly. In that case, you can
>> do one of two things
>>
>>   1) use the additional PETSc ./configure option
>> -download-metis-use-doubleprecision=1
>>
>> or
>>
>>   2) ensure that the arguments such as tpwgts that you pass in are not
>> PetscScalar but instead float. This would require changing your code
>> slightly.
>>
>>   Barry
>>
>>
>> On May 28, 2023, at 8:34 PM, s.pradeep kumar <spradeepmahadeek at gmail.com>
>> wrote:
>>
>> Dear All,
>>
>>        * I recently tried to install Metis along with PETSC 3.19.1,
>> using following command,*
>>
>> ./configure  --with-scalar-type=real --with-precision=double
>> --download-metis  --download-parmetis  --with-cmake=1
>>  --with-mpi-dir=/opt/cray/pe/mpich/8.1.9/ofi/gnu/9.1
>> --download-fblaslapack=1 --with-debugging=0 COPTFLAGS=-O2 FOPTFLAGS=-O2
>>
>> *While compiling my code, I get this warning sign, *
>>
>> 34: warning: passing argument 10 of 'ParMETIS_V3_PartKway' from
>> incompatible pointer type [-Wincompatible-pointer-types]
>>    79 |                     nparts,tpwgts,ubvec,options,
>>       |                                  ^~~~~~
>>       |                                  |
>>       |                                  PetscScalar * {aka double *}
>> In file included from /v2_petsc_check/ParmetisWrappers.c:5:
>> NumericalLibraries/petsc-3.19.1/gnu-opt/include/parmetis.h:70:22: note:
>> expected 'real_t *' {aka 'float *'} but argument is of type 'PetscScalar *'
>> {aka 'double *'}
>>    70 |              real_t *tpwgts, real_t *ubvec, idx_t *options, idx_t
>> *edgecut, idx_t *part,
>>       |              ~~~~~~~~^~~~~~
>> /v2_petsc_check/ParmetisWrappers.c:79:41: warning: passing argument 11 of
>> 'ParMETIS_V3_PartKway' from incompatible pointer type
>> [-Wincompatible-pointer-types]
>>    79 |                           nparts,tpwgts,ubvec,options,
>>       |                                         ^~~~~
>>       |                                         |
>>       |                                         PetscScalar * {aka double
>> *}
>>
>> *Ignoring the warning sign leads to code crashing due to Parmetis Error,*
>>
>> parmetis error: the sum of tpwgts for constraint #0 is not 1.0
>>
>> *How should I proceed further?*
>>
>> Regards,
>> Pradeep
>>
>>
>>
>
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