static char help[] = "Test memory leak when duplicating a redundant matrix.\n\n";

/*
  Include "petscmat.h" so that we can use matrices.
  automatically includes:
     petscsys.h    - base PETSc routines   petscvec.h    - vectors
     petscmat.h    - matrices
     petscis.h     - index sets            petscviewer.h - viewers
*/
#include <petscmat.h>

int main(int argc, char **args)
{
  Mat          A, Ar, C;
  PetscViewer  fd;                       /* viewer */
  char         file[PETSC_MAX_PATH_LEN]; /* input file name */
  PetscInt     ns = 2;
  PetscMPIInt  size;
  PetscSubcomm subc;
  PetscBool    flg;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  /*
     Determine files from which we read the two linear systems
     (matrix and right-hand-side vector).
  */
  PetscCall(PetscOptionsGetString(NULL, NULL, "-f0", file, sizeof(file), &flg));
  PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_USER, "Must indicate binary file with the -f0 option");
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &fd));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Reading matrix with %d processors\n", size));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
  PetscCall(MatLoad(A, fd));
  PetscCall(PetscViewerDestroy(&fd));
  /*
     Determines amount of subcomunicators
  */
  PetscCall(PetscOptionsGetInt(NULL, NULL, "-nsub", &ns, NULL));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Splitting in %" PetscInt_FMT " subcommunicators\n", ns));
  PetscCall(PetscSubcommCreate(PetscObjectComm((PetscObject)A), &subc));
  PetscCall(PetscSubcommSetNumber(subc, ns));
  PetscCall(PetscSubcommSetType(subc, PETSC_SUBCOMM_CONTIGUOUS));
  PetscCall(PetscSubcommSetFromOptions(subc));
  PetscCall(MatCreateRedundantMatrix(A, 0, PetscSubcommChild(subc), MAT_INITIAL_MATRIX, &Ar));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Copying matrix\n"));
  PetscCall(MatDuplicate(Ar, MAT_COPY_VALUES, &C));
  PetscCall(MatAXPY(Ar, 0.1, C, DIFFERENT_NONZERO_PATTERN));
  PetscCall(PetscSubcommDestroy(&subc));

  /*
     Free memory
  */
  PetscCall(MatDestroy(&A));
  PetscCall(MatDestroy(&Ar));
  PetscCall(MatDestroy(&C));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
      nsize: 4
      requires: !complex double !defined(PETSC_USE_64BIT_INDICES)
      args: -f0 ${wPETSC_DIR}/share/petsc/datafiles/matrices/ns-real-int32-float64 -malloc_dump

TEST*/