[petsc-users] PetscSFReduceBegin can not handle MPI_CHAR?

Wed Apr 3 03:39:56 CDT 2019

IIRC, MPI_CHAR is for ASCII text data. Also, remember that in C the
signedness of plain `char` is implementation (or platform?) dependent.
 I'm not sure MPI_Reduce() is supposed to / should  handle MPI_CHAR, you
should use MPI_{SIGNED|UNSIGNED}_CHAR for that. Note however that
MPI_SIGNED_CHAR is from MPI 2.0.

On Wed, 3 Apr 2019 at 07:01, Fande Kong via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hi All,
>
> There were some error messages when using PetscSFReduceBegin with
> MPI_CHAR.
>
> ierr =
> PetscSFReduceBegin(ptap->sf,MPI_CHAR,rmtspace,space,MPI_SUM);CHKERRQ(ierr);
>
>
> My question would be: Does PetscSFReduceBegin suppose work with MPI_CHAR?
> If not, should we document somewhere?
>
> Thanks
>
> Fande,
>
>
> [*0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------*
> *[0]PETSC ERROR: No support for this operation for this object type*
> *[0]PETSC ERROR: No support for type size not divisible by 4*
> *[0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
> <http://www.mcs.anl.gov/petsc/documentation/faq.html> for trouble shooting.*
> *[0]PETSC ERROR: Petsc Development GIT revision: v3.10.4-1989-gd816d1587e
>  GIT Date: 2019-04-02 17:37:18 -0600*
> *[0]PETSC ERROR: [1]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------*
> *[1]PETSC ERROR: No support for this operation for this object type*
> *[1]PETSC ERROR: No support for type size not divisible by 4*
> *[1]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
> <http://www.mcs.anl.gov/petsc/documentation/faq.html> for trouble shooting.*
> *[1]PETSC ERROR: Petsc Development GIT revision: v3.10.4-1989-gd816d1587e
>  GIT Date: 2019-04-02 17:37:18 -0600*
> *[1]PETSC ERROR: ./ex90 on a arch-linux2-c-dbg-feature-ptap-all-at-once
> named fn605731.local by kongf Tue Apr  2 21:48:41 2019*
> *[1]PETSC ERROR: Configure options --download-hypre=1 --with-debugging=yes
> --with-shared-libraries=1 --download-fblaslapack=1 --download-metis=1
> --download-parmetis=1 --download-superlu_dist=1
> PETSC_ARCH=arch-linux2-c-dbg-feature-ptap-all-at-once --download-ptscotch
> --download-party --download-chaco --with-cxx-dialect=C++11*
> *[1]PETSC ERROR: #1 PetscSFBasicPackTypeSetup() line 678 in
> /Users/kongf/projects/petsc/src/vec/is/sf/impls/basic/sfbasic.c*
> *[1]PETSC ERROR: #2 PetscSFBasicGetPack() line 804 in
> /Users/kongf/projects/petsc/src/vec/is/sf/impls/basic/sfbasic.c*
> *[1]PETSC ERROR: #3 PetscSFReduceBegin_Basic() line 1024 in
> /Users/kongf/projects/petsc/src/vec/is/sf/impls/basic/sfbasic.c*
> *./ex90 on a arch-linux2-c-dbg-feature-ptap-all-at-once named
> fn605731.local by kongf Tue Apr  2 21:48:41 2019*
> *[0]PETSC ERROR: Configure options --download-hypre=1 --with-debugging=yes
> --with-shared-libraries=1 --download-fblaslapack=1 --download-metis=1
> --download-parmetis=1 --download-superlu_dist=1
> PETSC_ARCH=arch-linux2-c-dbg-feature-ptap-all-at-once --download-ptscotch
> --download-party --download-chaco --with-cxx-dialect=C++11*
> *[0]PETSC ERROR: #1 PetscSFBasicPackTypeSetup() line 678 in
> /Users/kongf/projects/petsc/src/vec/is/sf/impls/basic/sfbasic.c*
> *[0]PETSC ERROR: #2 PetscSFBasicGetPack() line 804 in
> /Users/kongf/projects/petsc/src/vec/is/sf/impls/basic/sfbasic.c*
> *[0]PETSC ERROR: #3 PetscSFReduceBegin_Basic() line 1024 in
> /Users/kongf/projects/petsc/src/vec/is/sf/impls/basic/sfbasic.c*
> *[0]PETSC ERROR: #4 PetscSFReduceBegin() line 1208 in
> /Users/kongf/projects/petsc/src/vec/is/sf/interface/sf.c*
> *[0]PETSC ERROR: #5 MatPtAPNumeric_MPIAIJ_MPIAIJ_allatonce() line 850 in
> /Users/kongf/projects/petsc/src/mat/impls/aij/mpi/mpiptap.c*
> *[0]PETSC ERROR: #6 MatPtAP_MPIAIJ_MPIAIJ() line 202 in
> /Users/kongf/projects/petsc/src/mat/impls/aij/mpi/mpiptap.c*
> *[0]PETSC ERROR: #7 MatPtAP() line 9429 in
> /Users/kongf/projects/petsc/src/mat/interface/matrix.c*
> *[0]PETSC ERROR: #8 main() line 58 in
> /Users/kongf/projects/petsc/src/mat/examples/tests/ex90.c*
> *[0]PETSC ERROR: PETSc Option Table entries:*
> *[0]PETSC ERROR: -matptap_via allatonce*
> *[0]PETSC ERROR: ----------------End of Error Message -------send entire
> error message to petsc-maint at mcs.anl.gov----------*
> *[1]PETSC ERROR: #4 PetscSFReduceBegin() line 1208 in
> /Users/kongf/projects/petsc/src/vec/is/sf/interface/sf.c*
> *[1]PETSC ERROR: #5 MatPtAPNumeric_MPIAIJ_MPIAIJ_allatonce() line 850 in
> /Users/kongf/projects/petsc/src/mat/impls/aij/mpi/mpiptap.c*
> *[1]PETSC ERROR: #6 MatPtAP_MPIAIJ_MPIAIJ() line 202 in
> /Users/kongf/projects/petsc/src/mat/impls/aij/mpi/mpiptap.c*
> *[1]PETSC ERROR: #7 MatPtAP() line 9429 in
> /Users/kongf/projects/petsc/src/mat/interface/matrix.c*
> *[1]PETSC ERROR: #8 main() line 58 in
> /Users/kongf/projects/petsc/src/mat/examples/tests/ex90.c*
> *[1]PETSC ERROR: PETSc Option Table entries:*
> *[1]PETSC ERROR: -matptap_via allatonce*
> *[1]PETSC ERROR: ----------------End of Error Message -------send entire
> error message to petsc-maint at mcs.anl.gov----------*
>
> *--------------------------------------------------------------------------*
> *MPI_ABORT was invoked on rank 1 in communicator MPI_COMM_WORLD*
> *with errorcode 56.*
>
> *NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.*
> *You may or may not see output from other processes, depending on*
> *exactly when Open MPI kills them.*
>
> *--------------------------------------------------------------------------*
> *[fn605731.local:78133] 1 more process has sent help message
> help-mpi-api.txt / mpi-abort*
> *[fn605731.local:78133] Set MCA parameter "orte_base_help_aggregate" to 0
> to see all help / error messages*
>

-- 
Lisandro Dalcin
============
Research Scientist
Extreme Computing Research Center (ECRC)
King Abdullah University of Science and Technology (KAUST)
http://ecrc.kaust.edu.sa/
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