Actual source code: ex3.c

petsc-3.12.1 2019-10-22
Report Typos and Errors
  1: /*
  2:        Tests ISAllGather()
  3: */

  5: static char help[] = "Tests ISAllGather().\n\n";

  7:  #include <petscis.h>
  8:  #include <petscviewer.h>

 10: int main(int argc,char **argv)
 11: {
 13:   PetscInt       i,n,*indices;
 14:   PetscMPIInt    rank;
 15:   IS             is,newis;

 17:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 18:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);

 20:   /*
 21:      Create IS
 22:   */
 23:   n    = 4 + rank;
 24:   PetscMalloc1(n,&indices);
 25:   for (i=0; i<n; i++) indices[i] = rank + i;
 26:   ISCreateGeneral(PETSC_COMM_WORLD,n,indices,PETSC_COPY_VALUES,&is);
 27:   PetscFree(indices);

 29:   /*
 30:       Stick them together from all processors
 31:   */
 32:   ISAllGather(is,&newis);

 34:   if (!rank) {
 35:     ISView(newis,PETSC_VIEWER_STDOUT_SELF);
 36:   }

 38:   ISDestroy(&newis);
 39:   ISDestroy(&is);
 40:   PetscFinalize();
 41:   return ierr;
 42: }

 44: /*TEST

 46:    test:

 48: TEST*/