uses block index sets\n\n";
/* 'mpiexec -n 3 ./ex2 -vecscatter_type mpi3node' might give incorrect solution due to multiple cores write to the same variable */
#include <petscvec.h>
int main(int argc,char **argv)
{
PetscErrorCode ierr;
PetscInt bs=1,n=5,i,low;
PetscInt ix0[3] = {5,7,9},iy0[3] = {1,2,4},ix1[3] = {2,3,4},iy1[3] = {0,1,3};
PetscMPIInt size,rank;
PetscScalar *array;
Vec x,y;
IS isx,isy;
VecScatter ctx;
ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr);
ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr);
if (size <2) SETERRQ(PETSC_COMM_SELF,1,"Must run more than one processor");
ierr = PetscOptionsGetInt(NULL,NULL,"-bs",&bs,NULL);CHKERRQ(ierr);
n = bs*n;
/* Create vector x over shared memory */
ierr = VecCreate(PETSC_COMM_WORLD,&x);CHKERRQ(ierr);
ierr = VecSetSizes(x,n,PETSC_DECIDE);CHKERRQ(ierr);
ierr = VecSetType(x,VECNODE);CHKERRQ(ierr);
ierr = VecSetFromOptions(x);CHKERRQ(ierr);
ierr = VecGetOwnershipRange(x,&low,NULL);CHKERRQ(ierr);
ierr = VecGetArray(x,&array);CHKERRQ(ierr);
for (i=0; i<n; i++) {
array[i] = (PetscScalar)(i + low);
}
ierr = VecRestoreArray(x,&array);CHKERRQ(ierr);
/* Create a sequential vector y */
ierr = VecCreateSeq(PETSC_COMM_SELF,n,&y);CHKERRQ(ierr);
ierr = VecSet(y,0.0);CHKERRQ(ierr);
/* Create two index sets */
if (!rank) {
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,ix0,PETSC_COPY_VALUES,&isx);CHKERRQ(ierr);
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,iy0,PETSC_COPY_VALUES,&isy);CHKERRQ(ierr);
} else {
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,ix1,PETSC_COPY_VALUES,&isx);CHKERRQ(ierr);
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,iy1,PETSC_COPY_VALUES,&isy);CHKERRQ(ierr);
}
if (rank == 10) {
ierr = PetscPrintf(PETSC_COMM_SELF,"\n[%d] isx:\n",rank);CHKERRQ(ierr);
ierr = ISView(isx,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr);
}
ierr = VecScatterCreateWithData(x,isx,y,isy,&ctx);CHKERRQ(ierr);
ierr = VecScatterSetFromOptions(ctx);CHKERRQ(ierr);
/* Test forward vecscatter */
ierr = VecScatterBegin(ctx,x,y,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr);
ierr = VecScatterEnd(ctx,x,y,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr);
if (rank == 0) {
ierr = PetscPrintf(PETSC_COMM_SELF,"[%d] y:\n",rank);CHKERRQ(ierr);
ierr = VecView(y,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr);
}
/* Test reverse vecscatter */
ierr = VecScale(y,-1.0);CHKERRQ(ierr);
if (rank) {
ierr = VecScale(y,1.0/(size - 1));CHKERRQ(ierr);
}
ierr = VecScatterBegin(ctx,y,x,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr);
ierr = VecScatterEnd(ctx,y,x,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr);
ierr = VecView(x,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);
/* Free spaces */
ierr = VecScatterDestroy(&ctx);CHKERRQ(ierr);
ierr = ISDestroy(&isx);CHKERRQ(ierr);
ierr = ISDestroy(&isy);CHKERRQ(ierr);
ierr = VecDestroy(&x);CHKERRQ(ierr);
ierr = VecDestroy(&y);CHKERRQ(ierr);
ierr = PetscFinalize();
return ierr;
}
uses block index sets\n\n";
#include <petscvec.h>
int main(int argc,char **argv)
{
PetscErrorCode ierr;
PetscInt bs=1,n=5,N,i,low;
PetscInt ix0[3] = {5,7,9},iy0[3] = {1,2,4},ix1[3] = {2,3,1},iy1[3] = {0,3,9};
PetscMPIInt size,rank;
PetscScalar *array;
Vec x,x1,y;
IS isx,isy;
VecScatter ctx;
VecScatterType type;
PetscBool flg;
ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr);
ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr);
if (size <2) SETERRQ(PETSC_COMM_SELF,1,"Must run more than one processor");
ierr = PetscOptionsGetInt(NULL,NULL,"-bs",&bs,NULL);CHKERRQ(ierr);
n = bs*n;
/* Create vector x over shared memory */
ierr = VecCreate(PETSC_COMM_WORLD,&x);CHKERRQ(ierr);
ierr = VecSetSizes(x,n,PETSC_DECIDE);CHKERRQ(ierr);
ierr = VecSetType(x,VECNODE);CHKERRQ(ierr);
ierr = VecSetFromOptions(x);CHKERRQ(ierr);
ierr = VecGetOwnershipRange(x,&low,NULL);CHKERRQ(ierr);
ierr = VecGetArray(x,&array);CHKERRQ(ierr);
for (i=0; i<n; i++) {
array[i] = (PetscScalar)(i + low);
}
ierr = VecRestoreArray(x,&array);CHKERRQ(ierr);
/* ierr = VecView(x,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); */
/* Test some vector functions */
ierr = VecAssemblyBegin(x);CHKERRQ(ierr);
ierr = VecAssemblyEnd(x);CHKERRQ(ierr);
ierr = VecGetSize(x,&N);CHKERRQ(ierr);
ierr = VecGetLocalSize(x,&n);CHKERRQ(ierr);
ierr = VecDuplicate(x,&x1);CHKERRQ(ierr);
ierr = VecCopy(x,x1);CHKERRQ(ierr);
ierr = VecEqual(x,x1,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PetscObjectComm((PetscObject)x),PETSC_ERR_ARG_WRONG,"x1 != x");
ierr = VecScale(x1,2.0);CHKERRQ(ierr);
ierr = VecSet(x1,10.0);CHKERRQ(ierr);
/* ierr = VecView(x1,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); */
/* Create vector y over shared memory */
ierr = VecCreate(PETSC_COMM_WORLD,&y);CHKERRQ(ierr);
ierr = VecSetSizes(y,n,PETSC_DECIDE);CHKERRQ(ierr);
ierr = VecSetType(y,VECNODE);CHKERRQ(ierr);
ierr = VecSetFromOptions(y);CHKERRQ(ierr);
ierr = VecGetArray(y,&array);CHKERRQ(ierr);
for (i=0; i<n; i++) {
array[i] = -(PetscScalar) (i + 100*rank);
}
ierr = VecRestoreArray(y,&array);CHKERRQ(ierr);
ierr = VecAssemblyBegin(y);CHKERRQ(ierr);
ierr = VecAssemblyEnd(y);CHKERRQ(ierr);
/* ierr = VecView(y,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); */
/* Create two index sets */
if (!rank) {
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,ix0,PETSC_COPY_VALUES,&isx);CHKERRQ(ierr);
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,iy0,PETSC_COPY_VALUES,&isy);CHKERRQ(ierr);
} else {
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,ix1,PETSC_COPY_VALUES,&isx);CHKERRQ(ierr);
ierr = ISCreateBlock(PETSC_COMM_SELF,bs,3,iy1,PETSC_COPY_VALUES,&isy);CHKERRQ(ierr);
}
if (rank == 10) {
ierr = PetscPrintf(PETSC_COMM_SELF,"\n[%d] isx:\n",rank);CHKERRQ(ierr);
ierr = ISView(isx,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_SELF,"\n[%d] isy:\n",rank);CHKERRQ(ierr);
ierr = ISView(isy,PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr);
}
/* Create Vector scatter */
ierr = VecScatterCreate(x,isx,y,isy,&ctx);CHKERRQ(ierr);
ierr = VecScatterSetFromOptions(ctx);CHKERRQ(ierr);
ierr = VecScatterGetType(ctx,&type);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"scatter type %s\n",type);CHKERRQ(ierr);
/* Test forward vecscatter */
ierr = VecSet(y,0.0);CHKERRQ(ierr);
ierr = VecScatterBegin(ctx,x,y,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr);
ierr = VecScatterEnd(ctx,x,y,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"\nSCATTER_FORWARD y:\n");CHKERRQ(ierr);
ierr = VecView(y,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);
/* Test reverse vecscatter */
ierr = VecSet(x,0.0);CHKERRQ(ierr);
ierr = VecSet(y,0.0);CHKERRQ(ierr);
ierr = VecGetOwnershipRange(y,&low,NULL);CHKERRQ(ierr);
ierr = VecGetArray(y,&array);CHKERRQ(ierr);
for (i=0; i<n; i++) {
array[i] = (PetscScalar)(i+ low);
}
ierr = VecRestoreArray(y,&array);CHKERRQ(ierr);
ierr = VecScatterBegin(ctx,y,x,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr);
ierr = VecScatterEnd(ctx,y,x,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"\nSCATTER_REVERSE x:\n");CHKERRQ(ierr);
ierr = VecView(x,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);
/* Free objects */
ierr = VecScatterDestroy(&ctx);CHKERRQ(ierr);
ierr = ISDestroy(&isx);CHKERRQ(ierr);
ierr = ISDestroy(&isy);CHKERRQ(ierr);
ierr = VecDestroy(&x);CHKERRQ(ierr);
ierr = VecDestroy(&x1);CHKERRQ(ierr);
ierr = VecDestroy(&y);CHKERRQ(ierr);
ierr = PetscFinalize();
return ierr;
}