1 2 static char help[]= "Scatters between parallel vectors. \n\ 3 uses block index sets\n\n"; 4 5 #include <petscvec.h> 6 7 int main(int argc,char **argv) 8 { 9 PetscErrorCode ierr; 10 PetscInt bs=1,n=5,N,i,low; 11 PetscInt ix0[3] = {5,7,9},iy0[3] = {1,2,4},ix1[3] = {2,3,1},iy1[3] = {0,3,9}; 12 PetscMPIInt size,rank; 13 PetscScalar *array; 14 Vec x,x1,y; 15 IS isx,isy; 16 VecScatter ctx; 17 VecScatterType type; 18 PetscBool flg; 19 20 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 21 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 22 CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 23 24 PetscCheckFalse(size <2,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"Must run more than one processor"); 25 26 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-bs",&bs,NULL)); 27 n = bs*n; 28 29 /* Create vector x over shared memory */ 30 CHKERRQ(VecCreate(PETSC_COMM_WORLD,&x)); 31 CHKERRQ(VecSetSizes(x,n,PETSC_DECIDE)); 32 CHKERRQ(VecSetFromOptions(x)); 33 34 CHKERRQ(VecGetOwnershipRange(x,&low,NULL)); 35 CHKERRQ(VecGetArray(x,&array)); 36 for (i=0; i<n; i++) { 37 array[i] = (PetscScalar)(i + low); 38 } 39 CHKERRQ(VecRestoreArray(x,&array)); 40 /* CHKERRQ(VecView(x,PETSC_VIEWER_STDOUT_WORLD)); */ 41 42 /* Test some vector functions */ 43 CHKERRQ(VecAssemblyBegin(x)); 44 CHKERRQ(VecAssemblyEnd(x)); 45 46 CHKERRQ(VecGetSize(x,&N)); 47 CHKERRQ(VecGetLocalSize(x,&n)); 48 49 CHKERRQ(VecDuplicate(x,&x1)); 50 CHKERRQ(VecCopy(x,x1)); 51 CHKERRQ(VecEqual(x,x1,&flg)); 52 PetscCheck(flg,PetscObjectComm((PetscObject)x),PETSC_ERR_ARG_WRONG,"x1 != x"); 53 54 CHKERRQ(VecScale(x1,2.0)); 55 CHKERRQ(VecSet(x1,10.0)); 56 /* CHKERRQ(VecView(x1,PETSC_VIEWER_STDOUT_WORLD)); */ 57 58 /* Create vector y over shared memory */ 59 CHKERRQ(VecCreate(PETSC_COMM_WORLD,&y)); 60 CHKERRQ(VecSetSizes(y,n,PETSC_DECIDE)); 61 CHKERRQ(VecSetFromOptions(y)); 62 CHKERRQ(VecGetArray(y,&array)); 63 for (i=0; i<n; i++) { 64 array[i] = -(PetscScalar) (i + 100*rank); 65 } 66 CHKERRQ(VecRestoreArray(y,&array)); 67 CHKERRQ(VecAssemblyBegin(y)); 68 CHKERRQ(VecAssemblyEnd(y)); 69 /* CHKERRQ(VecView(y,PETSC_VIEWER_STDOUT_WORLD)); */ 70 71 /* Create two index sets */ 72 if (rank == 0) { 73 CHKERRQ(ISCreateBlock(PETSC_COMM_SELF,bs,3,ix0,PETSC_COPY_VALUES,&isx)); 74 CHKERRQ(ISCreateBlock(PETSC_COMM_SELF,bs,3,iy0,PETSC_COPY_VALUES,&isy)); 75 } else { 76 CHKERRQ(ISCreateBlock(PETSC_COMM_SELF,bs,3,ix1,PETSC_COPY_VALUES,&isx)); 77 CHKERRQ(ISCreateBlock(PETSC_COMM_SELF,bs,3,iy1,PETSC_COPY_VALUES,&isy)); 78 } 79 80 if (rank == 10) { 81 CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"\n[%d] isx:\n",rank)); 82 CHKERRQ(ISView(isx,PETSC_VIEWER_STDOUT_SELF)); 83 CHKERRQ(PetscPrintf(PETSC_COMM_SELF,"\n[%d] isy:\n",rank)); 84 CHKERRQ(ISView(isy,PETSC_VIEWER_STDOUT_SELF)); 85 } 86 87 /* Create Vector scatter */ 88 CHKERRQ(VecScatterCreate(x,isx,y,isy,&ctx)); 89 CHKERRQ(VecScatterSetFromOptions(ctx)); 90 CHKERRQ(VecScatterGetType(ctx,&type)); 91 CHKERRQ(PetscPrintf(PETSC_COMM_WORLD,"scatter type %s\n",type)); 92 93 /* Test forward vecscatter */ 94 CHKERRQ(VecSet(y,0.0)); 95 CHKERRQ(VecScatterBegin(ctx,x,y,ADD_VALUES,SCATTER_FORWARD)); 96 CHKERRQ(VecScatterEnd(ctx,x,y,ADD_VALUES,SCATTER_FORWARD)); 97 CHKERRQ(PetscPrintf(PETSC_COMM_WORLD,"\nSCATTER_FORWARD y:\n")); 98 CHKERRQ(VecView(y,PETSC_VIEWER_STDOUT_WORLD)); 99 100 /* Test reverse vecscatter */ 101 CHKERRQ(VecSet(x,0.0)); 102 CHKERRQ(VecSet(y,0.0)); 103 CHKERRQ(VecGetOwnershipRange(y,&low,NULL)); 104 CHKERRQ(VecGetArray(y,&array)); 105 for (i=0; i<n; i++) { 106 array[i] = (PetscScalar)(i+ low); 107 } 108 CHKERRQ(VecRestoreArray(y,&array)); 109 CHKERRQ(VecScatterBegin(ctx,y,x,ADD_VALUES,SCATTER_REVERSE)); 110 CHKERRQ(VecScatterEnd(ctx,y,x,ADD_VALUES,SCATTER_REVERSE)); 111 CHKERRQ(PetscPrintf(PETSC_COMM_WORLD,"\nSCATTER_REVERSE x:\n")); 112 CHKERRQ(VecView(x,PETSC_VIEWER_STDOUT_WORLD)); 113 114 /* Free objects */ 115 CHKERRQ(VecScatterDestroy(&ctx)); 116 CHKERRQ(ISDestroy(&isx)); 117 CHKERRQ(ISDestroy(&isy)); 118 CHKERRQ(VecDestroy(&x)); 119 CHKERRQ(VecDestroy(&x1)); 120 CHKERRQ(VecDestroy(&y)); 121 ierr = PetscFinalize(); 122 return ierr; 123 } 124 125 /*TEST 126 127 test: 128 nsize: 2 129 130 TEST*/ 131