Actual source code: ex3.c

  1: /*$Id: ex3.c,v 1.29 2001/08/10 03:34:29 bsmith Exp $*/

  3: static char help[] = "Tests AOData.\n\n";

 5:  #include petscao.h
 6:  #include petscbt.h

 10: int main(int argc,char **argv)
 11: {
 12:   int         n = 2,nglobal,bs = 2,*keys,*data,ierr,rank,size,i,start;
 13:   PetscReal   *gd;
 14:   AOData      aodata;
 15:   PetscViewer binary;
 16:   PetscBT     ld;

 18:   PetscInitialize(&argc,&argv,(char*)0,help);
 19:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);

 21:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank); n = n + rank;
 22:   MPI_Allreduce(&n,&nglobal,1,MPI_INT,MPI_SUM,PETSC_COMM_WORLD);
 23:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 25:   /*
 26:        Create a database with two sets of keys 
 27:   */
 28:   AODataCreateBasic(PETSC_COMM_WORLD,&aodata);
 29:   AODataKeyAdd(aodata,"key1",PETSC_DECIDE,nglobal);
 30:   AODataKeyAdd(aodata,"key2",PETSC_DECIDE,nglobal);

 32:   /* allocate space for the keys each processor will provide */
 33:   PetscMalloc(n*sizeof(int),&keys);

 35:   /*
 36:      We assign the first set of keys (0 to 2) to processor 0, etc.
 37:      This computes the first local key on each processor
 38:   */
 39:   MPI_Scan(&n,&start,1,MPI_INT,MPI_SUM,PETSC_COMM_WORLD);
 40:   start -= n;

 42:   for (i=0; i<n; i++) {
 43:     keys[i]     = start + i;
 44:   }

 46:   /* 
 47:       Allocate data for the first key and first segment 
 48:   */
 49:   PetscMalloc(bs*n*sizeof(int),&data);
 50:   for (i=0; i<n; i++) {
 51:     data[2*i]   = -(start + i);
 52:     data[2*i+1] = -(start + i) - 10000;
 53:   }
 54:   AODataSegmentAdd(aodata,"key1","seg1",bs,n,keys,data,PETSC_INT);
 55:   PetscFree(data);

 57:   /*
 58:       Allocate data for first key and second segment 
 59:   */
 60:   bs   = 3;
 61:   PetscMalloc(bs*n*sizeof(PetscReal),&gd);
 62:   for (i=0; i<n; i++) {
 63:     gd[3*i]   = -(start + i);
 64:     gd[3*i+1] = -(start + i) - 10000;
 65:     gd[3*i+2] = -(start + i) - 100000;
 66:   }
 67:   AODataSegmentAdd(aodata,"key1","seg2",bs,n,keys,gd,PETSC_REAL);

 69:   /*
 70:       Allocate data for first key and third segment 
 71:   */
 72:   bs   = 1;
 73:   PetscBTCreate(n,ld);
 74:   for (i=0; i<n; i++) {
 75:     if (i % 2) PetscBTSet(ld,i);
 76:   }
 77:   AODataSegmentAdd(aodata,"key1","seg3",bs,n,keys,ld,PETSC_LOGICAL);
 78:   PetscBTDestroy(ld);

 80:   /*
 81:        Use same data for second key and first segment 
 82:   */
 83:   bs   = 3;
 84:   AODataSegmentAdd(aodata,"key2","seg1",bs,n,keys,gd,PETSC_REAL);
 85:   PetscFree(gd);
 86:   PetscFree(keys);

 88:   AODataView(aodata,PETSC_VIEWER_STDOUT_WORLD);

 90:   /*
 91:         Save the database to a file
 92:   */
 93:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,"dataoutput",PETSC_FILE_CREATE,&binary);
 94:   AODataView(aodata,binary);
 95:   PetscViewerDestroy(binary);
 96: 
 97:   AODataDestroy(aodata);

 99:   PetscFinalize();
100:   return 0;
101: }
102: