int main(int argc,char **argv)
{
KSP ksp;
DM da;
UserContext user;
PetscInt bc;
PetscErrorCode ierr;
PetscInitialize(&argc,&argv,(char *)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,-11,-11,PETSC_DECIDE,PETSC_DECIDE,1,1,PETSC_NULL,PETSC_NULL,&da);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,(DM)da);
ierr = DMSetApplicationContext(da,&user);CHKERRQ(ierr);
user.uu = 1.0;
user.tt = 1.0;
bc = (PetscInt)NEUMANN; // Use Neumann Boundary Conditions
user.bcType = (BCType)bc;
ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeJacobian,&user);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp,PETSC_NULL,PETSC_NULL);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = PetscFinalize();CHKERRQ(ierr);
return 0;
}
int main(int argc, char **argv)
{
Mat A;
KSP ksp;
DM shell;
Vec *left, *right;
MPI_Comm c;
PetscErrorCode ierr;
ierr = PetscInitialize(&argc, &argv, NULL, NULL);if (ierr) return ierr;
c = PETSC_COMM_WORLD;
ierr = MatCreate(c, &A); CHKERRQ(ierr);
ierr = MatSetSizes(A, 1, 1, PETSC_DECIDE, PETSC_DECIDE); CHKERRQ(ierr);
ierr = MatSetFromOptions(A); CHKERRQ(ierr);
ierr = MatSetUp(A); CHKERRQ(ierr);
ierr = KSPCreate(c, &ksp); CHKERRQ(ierr);
ierr = KSPSetOperators(ksp, A, A); CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp); CHKERRQ(ierr);
ierr = DMShellCreate(c, &shell); CHKERRQ(ierr);
ierr = DMSetFromOptions(shell); CHKERRQ(ierr);
ierr = DMSetUp(shell); CHKERRQ(ierr);
ierr = KSPSetDM(ksp, shell); CHKERRQ(ierr);
ierr = KSPCreateVecs(ksp, 1, &right, 1, &left); CHKERRQ(ierr);
ierr = VecView(right[0], PETSC_VIEWER_STDOUT_(c));CHKERRQ(ierr);
ierr = VecDestroyVecs(1,&right); CHKERRQ(ierr);
ierr = VecDestroyVecs(1,&left); CHKERRQ(ierr);
ierr = DMDestroy(&shell); CHKERRQ(ierr);
ierr = KSPDestroy(&ksp); CHKERRQ(ierr);
ierr = MatDestroy(&A); CHKERRQ(ierr);
PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
KSP ksp;
DM da;
UserContext user;
PetscErrorCode ierr;
ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_PERIODIC, DM_BOUNDARY_MIRROR,DMDA_STENCIL_STAR,11,11,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da);CHKERRQ(ierr);
ierr = DMSetFromOptions(da);CHKERRQ(ierr);
ierr = DMSetUp(da);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,(DM)da);CHKERRQ(ierr);
ierr = DMSetApplicationContext(da,&user);CHKERRQ(ierr);
user.uu = 1.0;
user.tt = 1.0;
ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeJacobian,&user);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp,NULL,NULL);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = PetscFinalize();
return ierr;
}
int main(int argc,char **argv)
{
PetscErrorCode ierr;
PetscInt i;
KSP ksp;
DM da;
Vec x;
PetscInitialize(&argc,&argv,(char*)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate1d(PETSC_COMM_WORLD,DMDA_BOUNDARY_PERIODIC,-3,2,1,0,&da);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,da);CHKERRQ(ierr);
ierr = KSPSetComputeRHS(ksp,ComputeRHS,NULL);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,NULL);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(da,&x);CHKERRQ(ierr);
ierr = ComputeInitialSolution(da,x);CHKERRQ(ierr);
ierr = DMSetApplicationContext(da,x);CHKERRQ(ierr);
ierr = KSPSetUp(ksp);CHKERRQ(ierr);
ierr = VecView(x,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr);
for (i=0; i<10; i++) {
ierr = KSPSolve(ksp,NULL,x);CHKERRQ(ierr);
ierr = VecView(x,PETSC_VIEWER_DRAW_WORLD);CHKERRQ(ierr);
}
ierr = VecDestroy(&x);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
PetscErrorCode ierr;
KSP ksp;
DM da,shell;
PetscInt levels;
PetscInitialize(&argc,&argv,(char*)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate1d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,-129,1,1,0,&da);CHKERRQ(ierr);
ierr = MyDMShellCreate(PETSC_COMM_WORLD,da,&shell);CHKERRQ(ierr);
/* these two lines are not needed but allow PCMG to automatically know how many multigrid levels the user wants */
ierr = DMGetRefineLevel(da,&levels);CHKERRQ(ierr);
ierr = DMSetRefineLevel(shell,levels);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,shell);CHKERRQ(ierr);
ierr = KSPSetComputeRHS(ksp,ComputeRHS,NULL);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,NULL);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp,NULL,NULL);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = DMDestroy(&shell);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
KSP ksp;
DM da;
UserContext user;
const char *bcTypes[2] = {"dirichlet","neumann"};
PetscErrorCode ierr;
PetscInt bc;
Vec b,x;
PetscInitialize(&argc,&argv,(char *)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);
CHKERRQ(ierr);
ierr = DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,-3,-3,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,&da);
CHKERRQ(ierr);
ierr = DMDASetUniformCoordinates(da,0,1,0,1,0,0);
CHKERRQ(ierr);
ierr = DMDASetFieldName(da,0,"Pressure");
CHKERRQ(ierr);
ierr = PetscOptionsBegin(PETSC_COMM_WORLD, "", "Options for the inhomogeneous Poisson equation", "DMqq");
user.rho = 1.0;
ierr = PetscOptionsReal("-rho", "The conductivity", "ex29.c", user.rho, &user.rho, PETSC_NULL);
CHKERRQ(ierr);
user.nu = 0.1;
ierr = PetscOptionsReal("-nu", "The width of the Gaussian source", "ex29.c", user.nu, &user.nu, PETSC_NULL);
CHKERRQ(ierr);
bc = (PetscInt)DIRICHLET;
ierr = PetscOptionsEList("-bc_type","Type of boundary condition","ex29.c",bcTypes,2,bcTypes[0],&bc,PETSC_NULL);
CHKERRQ(ierr);
user.bcType = (BCType)bc;
ierr = PetscOptionsEnd();
ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);
CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,&user);
CHKERRQ(ierr);
ierr = KSPSetDM(ksp,da);
CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);
CHKERRQ(ierr);
ierr = KSPSetUp(ksp);
CHKERRQ(ierr);
ierr = KSPSolve(ksp,PETSC_NULL,PETSC_NULL);
CHKERRQ(ierr);
ierr = KSPGetSolution(ksp,&x);
CHKERRQ(ierr);
ierr = KSPGetRhs(ksp,&b);
CHKERRQ(ierr);
ierr = DMDestroy(&da);
CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);
CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
PetscErrorCode ierr;
KSP ksp;
PetscReal norm;
DM da;
Vec x,b,r;
Mat A;
PetscInitialize(&argc,&argv,(char *)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);
CHKERRQ(ierr);
ierr = DMDACreate3d(PETSC_COMM_WORLD,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,-7,-7,-7,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,0,&da);
CHKERRQ(ierr);
ierr = DMSetInitialGuess(da,ComputeInitialGuess);
CHKERRQ(ierr);
ierr = KSPSetComputeRHS(ksp,ComputeRHS,PETSC_NULL);
CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,PETSC_NULL);
CHKERRQ(ierr);
ierr = KSPSetDM(ksp,da);
CHKERRQ(ierr);
ierr = DMDestroy(&da);
CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);
CHKERRQ(ierr);
ierr = KSPSolve(ksp,PETSC_NULL,PETSC_NULL);
CHKERRQ(ierr);
ierr = KSPGetSolution(ksp,&x);
CHKERRQ(ierr);
ierr = KSPGetRhs(ksp,&b);
CHKERRQ(ierr);
ierr = VecDuplicate(b,&r);
CHKERRQ(ierr);
ierr = KSPGetOperators(ksp,&A,PETSC_NULL,PETSC_NULL);
CHKERRQ(ierr);
ierr = MatMult(A,x,r);
CHKERRQ(ierr);
ierr = VecAXPY(r,-1.0,b);
CHKERRQ(ierr);
ierr = VecNorm(r,NORM_2,&norm);
CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Residual norm %G\n",norm);
CHKERRQ(ierr);
ierr = VecDestroy(&r);
CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);
CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
PetscErrorCode ierr;
KSP ksp;
DM da;
AppCtx user;
Mat A;
Vec b,b2;
Vec x;
PetscReal nrm;
PetscInitialize(&argc,&argv,(char*)0,help);
user.k = 1;
user.e = .99;
ierr = PetscOptionsGetInt(0,"-k",&user.k,0);CHKERRQ(ierr);
ierr = PetscOptionsGetScalar(0,"-e",&user.e,0);CHKERRQ(ierr);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate1d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,-3,1,1,0,&da);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,da);CHKERRQ(ierr);
ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,&user);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp,NULL,NULL);CHKERRQ(ierr);
ierr = KSPGetOperators(ksp,&A,NULL);CHKERRQ(ierr);
ierr = KSPGetSolution(ksp,&x);CHKERRQ(ierr);
ierr = KSPGetRhs(ksp,&b);CHKERRQ(ierr);
ierr = VecDuplicate(b,&b2);CHKERRQ(ierr);
ierr = MatMult(A,x,b2);CHKERRQ(ierr);
ierr = VecAXPY(b2,-1.0,b);CHKERRQ(ierr);
ierr = VecNorm(b2,NORM_MAX,&nrm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Residual norm %g\n",(double)nrm);CHKERRQ(ierr);
ierr = VecDestroy(&b2);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
KSP ksp;
DM da;
Vec x, xNew;
UserContext user;
PetscErrorCode ierr;
PetscInitialize(&argc,&argv,(char*)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,3,3,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,&da);CHKERRQ(ierr);
ierr = DMSetApplicationContext(da, &user);CHKERRQ(ierr);
ierr = KSPSetDM(ksp, da);CHKERRQ(ierr);
ierr = PetscOptionsBegin(PETSC_COMM_WORLD, "", "Options for PCICE", "DM");
user.phi = 0.5;
ierr = PetscOptionsScalar("-phi", "The time weighting parameter", "ex31.c", user.phi, &user.phi, NULL);CHKERRQ(ierr);
user.dt = 0.1;
ierr = PetscOptionsScalar("-dt", "The time step", "ex31.c", user.dt, &user.dt, NULL);CHKERRQ(ierr);
ierr = PetscOptionsEnd();
ierr = CreateStructures(da, &user);CHKERRQ(ierr);
ierr = ComputePredictor(da, &user);CHKERRQ(ierr);
ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,&user);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp, NULL, NULL);CHKERRQ(ierr);
ierr = KSPGetSolution(ksp, &x);CHKERRQ(ierr);
ierr = VecDuplicate(x, &xNew);CHKERRQ(ierr);
ierr = ComputeCorrector(da, x, xNew);CHKERRQ(ierr);
ierr = VecDestroy(&xNew);CHKERRQ(ierr);
ierr = DestroyStructures(da, &user);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
KSP ksp;
DM da;
UserContext user;
const char *bcTypes[2] = {"dirichlet","neumann"};
PetscErrorCode ierr;
PetscInt bc;
PetscInitialize(&argc,&argv,(char*)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,12,12,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,&da);CHKERRQ(ierr);
ierr = DMDASetInterpolationType(da, DMDA_Q0);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,da);CHKERRQ(ierr);
ierr = PetscOptionsBegin(PETSC_COMM_WORLD, "", "Options for the inhomogeneous Poisson equation", "DM");
user.nu = 0.1;
ierr = PetscOptionsScalar("-nu", "The width of the Gaussian source", "ex29.c", 0.1, &user.nu, NULL);CHKERRQ(ierr);
bc = (PetscInt)NEUMANN;
ierr = PetscOptionsEList("-bc_type","Type of boundary condition","ex29.c",bcTypes,2,bcTypes[0],&bc,NULL);CHKERRQ(ierr);
user.bcType = (BCType)bc;
ierr = PetscOptionsEnd();
ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,&user);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp,NULL,NULL);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc,char **argv)
{
KSP ksp;
DM da;
PetscReal norm;
PetscErrorCode ierr;
PetscInt i,j,k,mx,my,mz,xm,ym,zm,xs,ys,zs;
PetscScalar Hx,Hy,Hz;
PetscScalar ***array;
Vec x,b,r;
Mat J;
PetscInitialize(&argc,&argv,(char*)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate3d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DMDA_STENCIL_STAR,-12,-12,-12,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,0,&da);CHKERRQ(ierr);
ierr = DMDASetInterpolationType(da, DMDA_Q0);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,da);CHKERRQ(ierr);
ierr = KSPSetComputeRHS(ksp,ComputeRHS,NULL);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,NULL);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp,NULL,NULL);CHKERRQ(ierr);
ierr = KSPGetSolution(ksp,&x);CHKERRQ(ierr);
ierr = KSPGetRhs(ksp,&b);CHKERRQ(ierr);
ierr = KSPGetOperators(ksp,NULL,&J);CHKERRQ(ierr);
ierr = VecDuplicate(b,&r);CHKERRQ(ierr);
ierr = MatMult(J,x,r);CHKERRQ(ierr);
ierr = VecAXPY(r,-1.0,b);CHKERRQ(ierr);
ierr = VecNorm(r,NORM_2,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Residual norm %g\n",(double)norm);CHKERRQ(ierr);
ierr = DMDAGetInfo(da, 0, &mx, &my, &mz, 0,0,0,0,0,0,0,0,0);CHKERRQ(ierr);
Hx = 1.0 / (PetscReal)(mx);
Hy = 1.0 / (PetscReal)(my);
Hz = 1.0 / (PetscReal)(mz);
ierr = DMDAGetCorners(da,&xs,&ys,&zs,&xm,&ym,&zm);CHKERRQ(ierr);
ierr = DMDAVecGetArray(da, x, &array);CHKERRQ(ierr);
for (k=zs; k<zs+zm; k++) {
for (j=ys; j<ys+ym; j++) {
for (i=xs; i<xs+xm; i++) {
array[k][j][i] -=
PetscCosScalar(2*PETSC_PI*(((PetscReal)i+0.5)*Hx))*
PetscCosScalar(2*PETSC_PI*(((PetscReal)j+0.5)*Hy))*
PetscCosScalar(2*PETSC_PI*(((PetscReal)k+0.5)*Hz));
}
}
}
ierr = DMDAVecRestoreArray(da, x, &array);CHKERRQ(ierr);
ierr = VecAssemblyBegin(x);CHKERRQ(ierr);
ierr = VecAssemblyEnd(x);CHKERRQ(ierr);
ierr = VecNorm(x,NORM_INFINITY,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Error norm %g\n",(double)norm);CHKERRQ(ierr);
ierr = VecNorm(x,NORM_1,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Error norm %g\n",(double)(norm/((PetscReal)(mx)*(PetscReal)(my)*(PetscReal)(mz))));CHKERRQ(ierr);
ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Error norm %g\n",(double)(norm/((PetscReal)(mx)*(PetscReal)(my)*(PetscReal)(mz))));CHKERRQ(ierr);
ierr = VecDestroy(&r);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
int main(int argc, char** argv)
{
DM da;
PetscErrorCode ierr;
Vec x, rhs;
Mat A, jac;
ierr = PetscInitialize(&argc, &argv, NULL, NULL);
CHKERRQ(ierr);
ierr = PetscOptionsBegin(PETSC_COMM_WORLD, NULL, "Laplacian in 2D", "");
CHKERRQ(ierr);
ierr = PetscOptionsEnd();
CHKERRQ(ierr);
ierr = HpddmRegisterKSP();
CHKERRQ(ierr);
MPI_Barrier(PETSC_COMM_WORLD);
double time = MPI_Wtime();
ierr = DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DMDA_STENCIL_STAR, 10, 10, PETSC_DECIDE, PETSC_DECIDE, 1, 1,
0, 0, &da);
CHKERRQ(ierr);
ierr = DMSetFromOptions(da);
CHKERRQ(ierr);
ierr = DMSetUp(da);
CHKERRQ(ierr);
ierr = DMCreateGlobalVector(da, &rhs);
CHKERRQ(ierr);
ierr = DMCreateGlobalVector(da, &x);
CHKERRQ(ierr);
ierr = DMCreateMatrix(da, &A);
CHKERRQ(ierr);
ierr = DMCreateMatrix(da, &jac);
CHKERRQ(ierr);
ierr = ComputeMatrix(da, jac, A);
CHKERRQ(ierr);
MPI_Barrier(PETSC_COMM_WORLD);
time = MPI_Wtime() - time;
ierr = PetscPrintf(PETSC_COMM_WORLD, "--- Mat assembly = %f\n", time);
CHKERRQ(ierr);
MPI_Barrier(PETSC_COMM_WORLD);
time = MPI_Wtime();
KSP ksp;
ierr = KSPCreate(PETSC_COMM_WORLD, &ksp);
CHKERRQ(ierr);
ierr = KSPSetDM(ksp, da);
CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);
CHKERRQ(ierr);
ierr = KSPSetOperators(ksp, A, A);
CHKERRQ(ierr);
ierr = KSPSetDMActive(ksp, PETSC_FALSE);
CHKERRQ(ierr);
ierr = KSPSetInitialGuessNonzero(ksp, PETSC_TRUE);
CHKERRQ(ierr);
ierr = KSPSetUp(ksp);
CHKERRQ(ierr);
MPI_Barrier(PETSC_COMM_WORLD);
time = MPI_Wtime() - time;
ierr = PetscPrintf(PETSC_COMM_WORLD, "--- PC setup = %f\n", time);
CHKERRQ(ierr);
PetscScalar nus[SIZE_ARRAY_NU] = {0.1, 10.0, 0.001, 100.0};
float t_time[SIZE_ARRAY_NU];
int t_its[SIZE_ARRAY_NU];
int i, j;
for (j = 0; j < 2; ++j) {
{
if (j == 1) {
ierr = KSPSetType(ksp, "hpddm");
CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);
CHKERRQ(ierr);
ierr = VecZeroEntries(x);
CHKERRQ(ierr);
}
ierr = KSPSolve(ksp, rhs, x);
CHKERRQ(ierr);
if (j == 1) {
const HpddmOption* const opt = HpddmOptionGet();
int previous = HpddmOptionVal(opt, "krylov_method");
if (previous == HPDDM_KRYLOV_METHOD_GCRODR || previous == HPDDM_KRYLOV_METHOD_BGCRODR) HpddmDestroyRecycling();
}
}
for (i = 0; i < SIZE_ARRAY_NU; ++i) {
ierr = VecZeroEntries(x);
CHKERRQ(ierr);
ierr = ComputeRHS(da, rhs, nus[i]);
CHKERRQ(ierr);
MPI_Barrier(PETSC_COMM_WORLD);
time = MPI_Wtime();
ierr = KSPSolve(ksp, rhs, x);
CHKERRQ(ierr);
MPI_Barrier(PETSC_COMM_WORLD);
t_time[i] = MPI_Wtime() - time;
PetscInt its;
ierr = KSPGetIterationNumber(ksp, &its);
CHKERRQ(ierr);
t_its[i] = its;
ierr = ComputeError(A, rhs, x);
CHKERRQ(ierr);
}
for (i = 0; i < SIZE_ARRAY_NU; ++i) {
ierr = PetscPrintf(PETSC_COMM_WORLD, "%d\t%d\t%f\n", i + 1, t_its[i], t_time[i]);
CHKERRQ(ierr);
if (i > 0) {
t_its[0] += t_its[i];
t_time[0] += t_time[i];
}
}
if (SIZE_ARRAY_NU > 1) {
ierr = PetscPrintf(PETSC_COMM_WORLD, "------------------------\n\t%d\t%f\n", t_its[0], t_time[0]);
CHKERRQ(ierr);
}
}
ierr = KSPDestroy(&ksp);
CHKERRQ(ierr);
ierr = VecDestroy(&x);
CHKERRQ(ierr);
ierr = VecDestroy(&rhs);
CHKERRQ(ierr);
ierr = MatDestroy(&A);
CHKERRQ(ierr);
ierr = MatDestroy(&jac);
CHKERRQ(ierr);
ierr = DMDestroy(&da);
CHKERRQ(ierr);
ierr = PetscFinalize();
return ierr;
}
void PETSC_STDCALL kspsetdm_(KSP ksp,DM dm, int *__ierr ){
*__ierr = KSPSetDM(
(KSP)PetscToPointer((ksp) ),
(DM)PetscToPointer((dm) ));
}
PetscSolver::PetscSolver(FlowField & flowField, Parameters & parameters):
LinearSolver(flowField, parameters), _ctx(parameters, flowField){
// Set the type of boundary nodes of the system
DMDABoundaryType bx = DMDA_BOUNDARY_NONE,
by = DMDA_BOUNDARY_NONE,
bz = DMDA_BOUNDARY_NONE;
if (parameters.walls.typeLeft==PERIODIC){
bx = DMDA_BOUNDARY_PERIODIC;
}
if (parameters.walls.typeBottom==PERIODIC){
by = DMDA_BOUNDARY_PERIODIC;
}
if (parameters.walls.typeFront==PERIODIC){
bz = DMDA_BOUNDARY_PERIODIC;
}
KSPCreate(PETSC_COMM_WORLD,&_ksp);
PetscErrorCode (*computeMatrix)(KSP, Mat, Mat, MatStructure*, void*) = NULL;
if (_parameters.geometry.dim == 2){
computeMatrix = computeMatrix2D;
DMDACreate2d(PETSC_COMM_WORLD, bx, by, DMDA_STENCIL_STAR,
parameters.geometry.sizeX+2, parameters.geometry.sizeY+2,
parameters.parallel.numProcessors[0],
parameters.parallel.numProcessors[1],
1, 2,
_parameters.parallel.sizes[0],
_parameters.parallel.sizes[1],
&_da);
} else if (_parameters.geometry.dim == 3){
computeMatrix = computeMatrix3D;
DMDACreate3d(PETSC_COMM_WORLD, bx, by, bz, DMDA_STENCIL_STAR,
parameters.geometry.sizeX + 2, parameters.geometry.sizeY + 2,
parameters.geometry.sizeZ + 2,
parameters.parallel.numProcessors[0],
parameters.parallel.numProcessors[1],
parameters.parallel.numProcessors[2],
1, 2, // Degrees of freedom and stencil length
_parameters.parallel.sizes[0],
_parameters.parallel.sizes[1],
_parameters.parallel.sizes[2],
&_da);
}
// Find out what are the corners of the subdomain
DMDAGetCorners(_da, &_firstX, &_firstY, &_firstZ, &_lengthX, &_lengthY, &_lengthZ);
// Current function to assign the limits
createLimits(parameters, _da, _limitsX, _limitsY, _limitsZ);
// Set the rank in the context. Necessary since PETSc declares the rank of the neighbors under
// periodic conditions as the rank of the process itself. So the rank must be known to properly
// set matrices and RHS vectors
int rank;
MPI_Comm_rank(PETSC_COMM_WORLD, &rank);
// Set offsets to fix where the results of the pressure will be written in the flow field
if (_firstX == 0){
_offsetX = 1;
} else {
_offsetX = 2;
}
if (_firstY == 0){
_offsetY = 1;
} else {
_offsetY = 2;
}
if (_firstZ == 0){
_offsetZ = 1;
} else {
_offsetZ = 2;
}
// Set a pointer to the limits in the context, so that they can be used by the function
_ctx.setLimits(_limitsX, _limitsY, _limitsZ);
// Determine whether a process writes a boundary on the system.
// Right now, it only depends on the position of the array. The identity of the neighbors will
// become significant only in the iterators, where it will apply a boundary condition only if
// the rank is invalid, so that there is no neighbor
_ctx.setAsBoundary = 0;
if (parameters.parallel.indices[0] == 0){
_ctx.setAsBoundary += LEFT_WALL_BIT;
}
if (parameters.parallel.indices[0] == parameters.parallel.numProcessors[0]-1){
_ctx.setAsBoundary += RIGHT_WALL_BIT;
}
if (parameters.parallel.indices[1] == 0){
_ctx.setAsBoundary += BOTTOM_WALL_BIT;
}
if (parameters.parallel.indices[1] == parameters.parallel.numProcessors[1]-1){
_ctx.setAsBoundary += TOP_WALL_BIT;
}
if (parameters.parallel.indices[2] == 0){
_ctx.setAsBoundary += FRONT_WALL_BIT;
}
if (parameters.parallel.indices[2] == parameters.parallel.numProcessors[2]-1){
_ctx.setAsBoundary += BACK_WALL_BIT;
}
// Set displacements to deal with periodic boundaries if necessary.
// If the boundary is periodic, it will take information from positions beyond the ghost cells,
// since they are used only for parallel communication. Otherwise, PETSc deals with
// communication of the pressure.
int Nx = parameters.geometry.sizeX + 2;
int Ny = parameters.geometry.sizeY + 2;
int Nz = parameters.geometry.sizeZ + 2;
if (parameters.walls.typeLeft==PERIODIC){
_ctx.displacement[0] = -2;
_ctx.displacement[1] = Nx+1;
} else {
_ctx.displacement[0] = 1;
_ctx.displacement[1] = Nx-2;
}
if (parameters.walls.typeBottom==PERIODIC){
_ctx.displacement[2] = -2;
_ctx.displacement[3] = Ny+1;
} else {
_ctx.displacement[2] = 1;
_ctx.displacement[3] = Ny-2;
}
if (parameters.walls.typeFront==PERIODIC){
_ctx.displacement[4] = -2;
_ctx.displacement[5] = Nz+1;
} else {
_ctx.displacement[4] = 1;
_ctx.displacement[5] = Nz-2;
}
DMCreateGlobalVector(_da, &_x);
KSPSetDM(_ksp, _da);
KSPSetComputeOperators(_ksp, computeMatrix, &_ctx);
KSPSetType(_ksp,KSPFGMRES);
KSPSetFromOptions(_ksp);
KSPSetInitialGuessNonzero(_ksp,PETSC_TRUE);
}
PetscErrorCode efs_setup(efs *slv, int offset[], int stride[])
{
PetscErrorCode ierr;
PetscInt xs, ys, zs, xm, ym, zm;
PCType pc_type;
if (efs_log(slv, EFS_LOG_STATUS)) {
ierr = ef_io_print(slv->comm, "Setting up electric field solver");CHKERRQ(ierr);
}
slv->ts = 0;
if (efs_log(slv, EFS_LOG_RESIDUAL)) {
ierr = PetscOptionsSetValue("-ksp_monitor_short", NULL);CHKERRQ(ierr);
}
ierr = DMDASetFieldName(slv->dm, 0,"potential");CHKERRQ(ierr);
if (slv->grid.nd == 2) {
ierr = DMDAGetCorners(slv->dm, &xs, &ys, 0, &xm, &ym, 0);CHKERRQ(ierr);
slv->dmap = ef_dmap_create_2d(xs - offset[0], ys - offset[1], xm, ym, stride);
} else if (slv->grid.nd == 3) {
ierr = DMDAGetCorners(slv->dm, &xs, &ys, &zs, &xm, &ym, &zm);CHKERRQ(ierr);
slv->dmap = ef_dmap_create_3d(xs - offset[0], ys - offset[1], zs - offset[2], xm, ym, zm, stride);
} else {
SETERRQ1(PETSC_COMM_WORLD, PETSC_ERR_SUP, "Unsupported dimmension: %d", slv->grid.nd);
}
ierr = ef_callback_create(&slv->callback);CHKERRQ(ierr);
ierr = KSPCreate(slv->comm, &slv->ksp);CHKERRQ(ierr);
if (efs_log(slv, EFS_LOG_EIGS)) {
ierr = KSPSetComputeEigenvalues(slv->ksp, PETSC_TRUE);CHKERRQ(ierr);
}
ierr = KSPSetDM(slv->ksp, slv->dm);CHKERRQ(ierr);
ierr = KSPGetPC(slv->ksp, &slv->pc);CHKERRQ(ierr);
ierr = PCSetType(slv->pc, PCMG);CHKERRQ(ierr);
if (slv->options.galerkin) {
ierr = PCMGSetGalerkin(slv->pc, PETSC_TRUE);CHKERRQ(ierr);
} else {
ierr = PCMGSetGalerkin(slv->pc, PETSC_FALSE);CHKERRQ(ierr);
}
ierr = KSPSetComputeOperators(slv->ksp, slv->callback->matrix, slv);CHKERRQ(ierr);
ierr = KSPSetComputeRHS(slv->ksp, slv->callback->rhs, slv);CHKERRQ(ierr);
ierr = KSPSetComputeInitialGuess(slv->ksp, slv->callback->guess, slv);CHKERRQ(ierr);
ierr = KSPSetFromOptions(slv->ksp);CHKERRQ(ierr);
ierr = PCGetType(slv->pc, &pc_type);CHKERRQ(ierr);
ierr = PCMGGetLevels(slv->pc, &slv->options.levels);CHKERRQ(ierr);
if (slv->options.levels < 1) slv->options.levels++;
ierr = PCMGGetGalerkin(slv->pc, &slv->options.galerkin);CHKERRQ(ierr);
if (strcmp(pc_type, PCGAMG) == 0
|| strcmp(pc_type, PCHYPRE) == 0) slv->options.galerkin = 1;
if (!slv->options.galerkin) {
slv->levels = (ef_level*) malloc(slv->options.levels*sizeof(ef_level));
// setup callback for transforming rhs on coarse levels
} else {
slv->levels = (ef_level*) malloc(sizeof(ef_level));
}
ierr = ef_fd_create(&slv->fd, EF_FD_STANDARD_O2);CHKERRQ(ierr);
ierr = ef_operator_create(&slv->op, slv->levels, slv->fd, slv->grid.nd);CHKERRQ(ierr);
ierr = ef_boundary_create(&slv->boundary, slv->levels, slv->options.levels,
slv->dmap, &slv->state, slv->fd);CHKERRQ(ierr);
slv->op->axisymmetric = slv->options.axisymmetric;
slv->boundary->axisymmetric = slv->options.axisymmetric;
ierr = DMSetMatType(slv->dm, MATAIJ);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(slv->dm, &slv->levels[0].eps);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(slv->dm, &slv->levels[0].g);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(slv->dm, &slv->levels[0].ag);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(slv->dm, &slv->levels[0].gcomp);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(slv->dm, &slv->levels[0].scale);CHKERRQ(ierr);
ierr = DMCreateGlobalVector(slv->dm, &slv->levels[0].nscale);CHKERRQ(ierr);
ierr = VecSet(slv->levels[0].g, 0);CHKERRQ(ierr);
ierr = VecSet(slv->levels[0].gcomp, 1);CHKERRQ(ierr);
ierr = VecSet(slv->levels[0].scale, 1);CHKERRQ(ierr);
ierr = VecSet(slv->levels[0].nscale, 1);CHKERRQ(ierr);
ierr = DMCoarsenHookAdd(slv->dm, slv->callback->coarsen, slv->callback->restrct, slv);CHKERRQ(ierr);
return 0;
}
PetscErrorCode PCSetUp_MG(PC pc)
{
PC_MG *mg = (PC_MG*)pc->data;
PC_MG_Levels **mglevels = mg->levels;
PetscErrorCode ierr;
PetscInt i,n = mglevels[0]->levels;
PC cpc;
PetscBool dump = PETSC_FALSE,opsset,use_amat,missinginterpolate = PETSC_FALSE;
Mat dA,dB;
Vec tvec;
DM *dms;
PetscViewer viewer = 0;
PetscFunctionBegin;
/* FIX: Move this to PCSetFromOptions_MG? */
if (mg->usedmfornumberoflevels) {
PetscInt levels;
ierr = DMGetRefineLevel(pc->dm,&levels);CHKERRQ(ierr);
levels++;
if (levels > n) { /* the problem is now being solved on a finer grid */
ierr = PCMGSetLevels(pc,levels,NULL);CHKERRQ(ierr);
n = levels;
ierr = PCSetFromOptions(pc);CHKERRQ(ierr); /* it is bad to call this here, but otherwise will never be called for the new hierarchy */
mglevels = mg->levels;
}
}
ierr = KSPGetPC(mglevels[0]->smoothd,&cpc);CHKERRQ(ierr);
/* If user did not provide fine grid operators OR operator was not updated since last global KSPSetOperators() */
/* so use those from global PC */
/* Is this what we always want? What if user wants to keep old one? */
ierr = KSPGetOperatorsSet(mglevels[n-1]->smoothd,NULL,&opsset);CHKERRQ(ierr);
if (opsset) {
Mat mmat;
ierr = KSPGetOperators(mglevels[n-1]->smoothd,NULL,&mmat);CHKERRQ(ierr);
if (mmat == pc->pmat) opsset = PETSC_FALSE;
}
if (!opsset) {
ierr = PCGetUseAmat(pc,&use_amat);CHKERRQ(ierr);
if(use_amat){
ierr = PetscInfo(pc,"Using outer operators to define finest grid operator \n because PCMGGetSmoother(pc,nlevels-1,&ksp);KSPSetOperators(ksp,...); was not called.\n");CHKERRQ(ierr);
ierr = KSPSetOperators(mglevels[n-1]->smoothd,pc->mat,pc->pmat);CHKERRQ(ierr);
}
else {
ierr = PetscInfo(pc,"Using matrix (pmat) operators to define finest grid operator \n because PCMGGetSmoother(pc,nlevels-1,&ksp);KSPSetOperators(ksp,...); was not called.\n");CHKERRQ(ierr);
ierr = KSPSetOperators(mglevels[n-1]->smoothd,pc->pmat,pc->pmat);CHKERRQ(ierr);
}
}
for (i=n-1; i>0; i--) {
if (!(mglevels[i]->interpolate || mglevels[i]->restrct)) {
missinginterpolate = PETSC_TRUE;
continue;
}
}
/*
Skipping if user has provided all interpolation/restriction needed (since DM might not be able to produce them (when coming from SNES/TS)
Skipping for galerkin==2 (externally managed hierarchy such as ML and GAMG). Cleaner logic here would be great. Wrap ML/GAMG as DMs?
*/
if (missinginterpolate && pc->dm && mg->galerkin != 2 && !pc->setupcalled) {
/* construct the interpolation from the DMs */
Mat p;
Vec rscale;
ierr = PetscMalloc1(n,&dms);CHKERRQ(ierr);
dms[n-1] = pc->dm;
/* Separately create them so we do not get DMKSP interference between levels */
for (i=n-2; i>-1; i--) {ierr = DMCoarsen(dms[i+1],MPI_COMM_NULL,&dms[i]);CHKERRQ(ierr);}
for (i=n-2; i>-1; i--) {
DMKSP kdm;
PetscBool dmhasrestrict;
ierr = KSPSetDM(mglevels[i]->smoothd,dms[i]);CHKERRQ(ierr);
if (mg->galerkin) {ierr = KSPSetDMActive(mglevels[i]->smoothd,PETSC_FALSE);CHKERRQ(ierr);}
ierr = DMGetDMKSPWrite(dms[i],&kdm);CHKERRQ(ierr);
/* Ugly hack so that the next KSPSetUp() will use the RHS that we set. A better fix is to change dmActive to take
* a bitwise OR of computing the matrix, RHS, and initial iterate. */
kdm->ops->computerhs = NULL;
kdm->rhsctx = NULL;
if (!mglevels[i+1]->interpolate) {
ierr = DMCreateInterpolation(dms[i],dms[i+1],&p,&rscale);CHKERRQ(ierr);
ierr = PCMGSetInterpolation(pc,i+1,p);CHKERRQ(ierr);
if (rscale) {ierr = PCMGSetRScale(pc,i+1,rscale);CHKERRQ(ierr);}
ierr = VecDestroy(&rscale);CHKERRQ(ierr);
ierr = MatDestroy(&p);CHKERRQ(ierr);
}
ierr = DMHasCreateRestriction(dms[i],&dmhasrestrict);CHKERRQ(ierr);
if (dmhasrestrict && !mglevels[i+1]->restrct){
ierr = DMCreateRestriction(dms[i],dms[i+1],&p);CHKERRQ(ierr);
ierr = PCMGSetRestriction(pc,i+1,p);CHKERRQ(ierr);
ierr = MatDestroy(&p);CHKERRQ(ierr);
}
}
for (i=n-2; i>-1; i--) {ierr = DMDestroy(&dms[i]);CHKERRQ(ierr);}
ierr = PetscFree(dms);CHKERRQ(ierr);
}
if (pc->dm && !pc->setupcalled) {
/* finest smoother also gets DM but it is not active, independent of whether galerkin==2 */
ierr = KSPSetDM(mglevels[n-1]->smoothd,pc->dm);CHKERRQ(ierr);
ierr = KSPSetDMActive(mglevels[n-1]->smoothd,PETSC_FALSE);CHKERRQ(ierr);
}
if (mg->galerkin == 1) {
Mat B;
/* currently only handle case where mat and pmat are the same on coarser levels */
ierr = KSPGetOperators(mglevels[n-1]->smoothd,&dA,&dB);CHKERRQ(ierr);
if (!pc->setupcalled) {
for (i=n-2; i>-1; i--) {
if (!mglevels[i+1]->restrct && !mglevels[i+1]->interpolate) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Must provide interpolation or restriction for each MG level except level 0");
if (!mglevels[i+1]->interpolate) {
ierr = PCMGSetInterpolation(pc,i+1,mglevels[i+1]->restrct);CHKERRQ(ierr);
}
if (!mglevels[i+1]->restrct) {
ierr = PCMGSetRestriction(pc,i+1,mglevels[i+1]->interpolate);CHKERRQ(ierr);
}
if (mglevels[i+1]->interpolate == mglevels[i+1]->restrct) {
ierr = MatPtAP(dB,mglevels[i+1]->interpolate,MAT_INITIAL_MATRIX,1.0,&B);CHKERRQ(ierr);
} else {
ierr = MatMatMatMult(mglevels[i+1]->restrct,dB,mglevels[i+1]->interpolate,MAT_INITIAL_MATRIX,1.0,&B);CHKERRQ(ierr);
}
ierr = KSPSetOperators(mglevels[i]->smoothd,B,B);CHKERRQ(ierr);
if (i != n-2) {ierr = PetscObjectDereference((PetscObject)dB);CHKERRQ(ierr);}
dB = B;
}
if (n > 1) {ierr = PetscObjectDereference((PetscObject)dB);CHKERRQ(ierr);}
} else {
for (i=n-2; i>-1; i--) {
if (!mglevels[i+1]->restrct && !mglevels[i+1]->interpolate) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONGSTATE,"Must provide interpolation or restriction for each MG level except level 0");
if (!mglevels[i+1]->interpolate) {
ierr = PCMGSetInterpolation(pc,i+1,mglevels[i+1]->restrct);CHKERRQ(ierr);
}
if (!mglevels[i+1]->restrct) {
ierr = PCMGSetRestriction(pc,i+1,mglevels[i+1]->interpolate);CHKERRQ(ierr);
}
ierr = KSPGetOperators(mglevels[i]->smoothd,NULL,&B);CHKERRQ(ierr);
if (mglevels[i+1]->interpolate == mglevels[i+1]->restrct) {
ierr = MatPtAP(dB,mglevels[i+1]->interpolate,MAT_REUSE_MATRIX,1.0,&B);CHKERRQ(ierr);
} else {
ierr = MatMatMatMult(mglevels[i+1]->restrct,dB,mglevels[i+1]->interpolate,MAT_REUSE_MATRIX,1.0,&B);CHKERRQ(ierr);
}
ierr = KSPSetOperators(mglevels[i]->smoothd,B,B);CHKERRQ(ierr);
dB = B;
}
}
} else if (!mg->galerkin && pc->dm && pc->dm->x) {
/* need to restrict Jacobian location to coarser meshes for evaluation */
for (i=n-2; i>-1; i--) {
Mat R;
Vec rscale;
if (!mglevels[i]->smoothd->dm->x) {
Vec *vecs;
ierr = KSPCreateVecs(mglevels[i]->smoothd,1,&vecs,0,NULL);CHKERRQ(ierr);
mglevels[i]->smoothd->dm->x = vecs[0];
ierr = PetscFree(vecs);CHKERRQ(ierr);
}
ierr = PCMGGetRestriction(pc,i+1,&R);CHKERRQ(ierr);
ierr = PCMGGetRScale(pc,i+1,&rscale);CHKERRQ(ierr);
ierr = MatRestrict(R,mglevels[i+1]->smoothd->dm->x,mglevels[i]->smoothd->dm->x);CHKERRQ(ierr);
ierr = VecPointwiseMult(mglevels[i]->smoothd->dm->x,mglevels[i]->smoothd->dm->x,rscale);CHKERRQ(ierr);
}
}
if (!mg->galerkin && pc->dm) {
for (i=n-2; i>=0; i--) {
DM dmfine,dmcoarse;
Mat Restrict,Inject;
Vec rscale;
ierr = KSPGetDM(mglevels[i+1]->smoothd,&dmfine);CHKERRQ(ierr);
ierr = KSPGetDM(mglevels[i]->smoothd,&dmcoarse);CHKERRQ(ierr);
ierr = PCMGGetRestriction(pc,i+1,&Restrict);CHKERRQ(ierr);
ierr = PCMGGetRScale(pc,i+1,&rscale);CHKERRQ(ierr);
Inject = NULL; /* Callback should create it if it needs Injection */
ierr = DMRestrict(dmfine,Restrict,rscale,Inject,dmcoarse);CHKERRQ(ierr);
}
}
if (!pc->setupcalled) {
for (i=0; i<n; i++) {
ierr = KSPSetFromOptions(mglevels[i]->smoothd);CHKERRQ(ierr);
}
for (i=1; i<n; i++) {
if (mglevels[i]->smoothu && (mglevels[i]->smoothu != mglevels[i]->smoothd)) {
ierr = KSPSetFromOptions(mglevels[i]->smoothu);CHKERRQ(ierr);
}
}
/* insure that if either interpolation or restriction is set the other other one is set */
for (i=1; i<n; i++) {
ierr = PCMGGetInterpolation(pc,i,NULL);CHKERRQ(ierr);
ierr = PCMGGetRestriction(pc,i,NULL);CHKERRQ(ierr);
}
for (i=0; i<n-1; i++) {
if (!mglevels[i]->b) {
Vec *vec;
ierr = KSPCreateVecs(mglevels[i]->smoothd,1,&vec,0,NULL);CHKERRQ(ierr);
ierr = PCMGSetRhs(pc,i,*vec);CHKERRQ(ierr);
ierr = VecDestroy(vec);CHKERRQ(ierr);
ierr = PetscFree(vec);CHKERRQ(ierr);
}
if (!mglevels[i]->r && i) {
ierr = VecDuplicate(mglevels[i]->b,&tvec);CHKERRQ(ierr);
ierr = PCMGSetR(pc,i,tvec);CHKERRQ(ierr);
ierr = VecDestroy(&tvec);CHKERRQ(ierr);
}
if (!mglevels[i]->x) {
ierr = VecDuplicate(mglevels[i]->b,&tvec);CHKERRQ(ierr);
ierr = PCMGSetX(pc,i,tvec);CHKERRQ(ierr);
ierr = VecDestroy(&tvec);CHKERRQ(ierr);
}
}
if (n != 1 && !mglevels[n-1]->r) {
/* PCMGSetR() on the finest level if user did not supply it */
Vec *vec;
ierr = KSPCreateVecs(mglevels[n-1]->smoothd,1,&vec,0,NULL);CHKERRQ(ierr);
ierr = PCMGSetR(pc,n-1,*vec);CHKERRQ(ierr);
ierr = VecDestroy(vec);CHKERRQ(ierr);
ierr = PetscFree(vec);CHKERRQ(ierr);
}
}
if (pc->dm) {
/* need to tell all the coarser levels to rebuild the matrix using the DM for that level */
for (i=0; i<n-1; i++) {
if (mglevels[i]->smoothd->setupstage != KSP_SETUP_NEW) mglevels[i]->smoothd->setupstage = KSP_SETUP_NEWMATRIX;
}
}
for (i=1; i<n; i++) {
if (mglevels[i]->smoothu == mglevels[i]->smoothd || mg->am == PC_MG_FULL || mg->am == PC_MG_KASKADE || mg->cyclesperpcapply > 1){
/* if doing only down then initial guess is zero */
ierr = KSPSetInitialGuessNonzero(mglevels[i]->smoothd,PETSC_TRUE);CHKERRQ(ierr);
}
if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventBegin(mglevels[i]->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);}
ierr = KSPSetUp(mglevels[i]->smoothd);CHKERRQ(ierr);
if (mglevels[i]->smoothd->reason == KSP_DIVERGED_PCSETUP_FAILED) {
pc->failedreason = PC_SUBPC_ERROR;
}
if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventEnd(mglevels[i]->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);}
if (!mglevels[i]->residual) {
Mat mat;
ierr = KSPGetOperators(mglevels[i]->smoothd,NULL,&mat);CHKERRQ(ierr);
ierr = PCMGSetResidual(pc,i,PCMGResidualDefault,mat);CHKERRQ(ierr);
}
}
for (i=1; i<n; i++) {
if (mglevels[i]->smoothu && mglevels[i]->smoothu != mglevels[i]->smoothd) {
Mat downmat,downpmat;
/* check if operators have been set for up, if not use down operators to set them */
ierr = KSPGetOperatorsSet(mglevels[i]->smoothu,&opsset,NULL);CHKERRQ(ierr);
if (!opsset) {
ierr = KSPGetOperators(mglevels[i]->smoothd,&downmat,&downpmat);CHKERRQ(ierr);
ierr = KSPSetOperators(mglevels[i]->smoothu,downmat,downpmat);CHKERRQ(ierr);
}
ierr = KSPSetInitialGuessNonzero(mglevels[i]->smoothu,PETSC_TRUE);CHKERRQ(ierr);
if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventBegin(mglevels[i]->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);}
ierr = KSPSetUp(mglevels[i]->smoothu);CHKERRQ(ierr);
if (mglevels[i]->smoothu->reason == KSP_DIVERGED_PCSETUP_FAILED) {
pc->failedreason = PC_SUBPC_ERROR;
}
if (mglevels[i]->eventsmoothsetup) {ierr = PetscLogEventEnd(mglevels[i]->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);}
}
}
if (mglevels[0]->eventsmoothsetup) {ierr = PetscLogEventBegin(mglevels[0]->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);}
ierr = KSPSetUp(mglevels[0]->smoothd);CHKERRQ(ierr);
if (mglevels[0]->smoothd->reason == KSP_DIVERGED_PCSETUP_FAILED) {
pc->failedreason = PC_SUBPC_ERROR;
}
if (mglevels[0]->eventsmoothsetup) {ierr = PetscLogEventEnd(mglevels[0]->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);}
/*
Dump the interpolation/restriction matrices plus the
Jacobian/stiffness on each level. This allows MATLAB users to
easily check if the Galerkin condition A_c = R A_f R^T is satisfied.
Only support one or the other at the same time.
*/
#if defined(PETSC_USE_SOCKET_VIEWER)
ierr = PetscOptionsGetBool(((PetscObject)pc)->options,((PetscObject)pc)->prefix,"-pc_mg_dump_matlab",&dump,NULL);CHKERRQ(ierr);
if (dump) viewer = PETSC_VIEWER_SOCKET_(PetscObjectComm((PetscObject)pc));
dump = PETSC_FALSE;
#endif
ierr = PetscOptionsGetBool(((PetscObject)pc)->options,((PetscObject)pc)->prefix,"-pc_mg_dump_binary",&dump,NULL);CHKERRQ(ierr);
if (dump) viewer = PETSC_VIEWER_BINARY_(PetscObjectComm((PetscObject)pc));
if (viewer) {
for (i=1; i<n; i++) {
ierr = MatView(mglevels[i]->restrct,viewer);CHKERRQ(ierr);
}
for (i=0; i<n; i++) {
ierr = KSPGetPC(mglevels[i]->smoothd,&pc);CHKERRQ(ierr);
ierr = MatView(pc->mat,viewer);CHKERRQ(ierr);
}
}
PetscFunctionReturn(0);
}
int main(int argc,char **argv)
{
KSP ksp;
DM da;
UserContext user;
PetscReal norm;
const char *bcTypes[2] = {"dirichlet","neumann"};
PetscErrorCode ierr;
PetscInt bc;
PetscInt i,j,k,mx,my,mz,xm,ym,zm,xs,ys,zs;
PetscScalar Hx,Hy,Hz;
PetscScalar ***array;
Vec x,b,r;
Mat J;
PetscInitialize(&argc,&argv,(char *)0,help);
ierr = KSPCreate(PETSC_COMM_WORLD,&ksp);CHKERRQ(ierr);
ierr = DMDACreate3d(PETSC_COMM_WORLD,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,DMDA_STENCIL_STAR,12,12,12,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,0,&da);CHKERRQ(ierr);
ierr = DMDASetInterpolationType(da, DMDA_Q0);CHKERRQ(ierr);
ierr = KSPSetDM(ksp,da);CHKERRQ(ierr);
ierr = PetscOptionsBegin(PETSC_COMM_WORLD, "", "Options for the inhomogeneous Poisson equation", "DM");
bc = (PetscInt)NEUMANN;
ierr = PetscOptionsEList("-bc_type","Type of boundary condition","ex34.c",bcTypes,2,bcTypes[0],&bc,PETSC_NULL);CHKERRQ(ierr);
user.bcType = (BCType)bc;
ierr = PetscOptionsEnd();
ierr = KSPSetComputeRHS(ksp,ComputeRHS,&user);CHKERRQ(ierr);
ierr = KSPSetComputeOperators(ksp,ComputeMatrix,&user);CHKERRQ(ierr);
ierr = KSPSetFromOptions(ksp);CHKERRQ(ierr);
ierr = KSPSolve(ksp,PETSC_NULL,PETSC_NULL);CHKERRQ(ierr);
ierr = KSPGetSolution(ksp,&x);CHKERRQ(ierr);
ierr = KSPGetRhs(ksp,&b);CHKERRQ(ierr);
ierr = KSPGetOperators(ksp,PETSC_NULL,&J,PETSC_NULL);CHKERRQ(ierr);
ierr = VecDuplicate(b,&r);CHKERRQ(ierr);
ierr = MatMult(J,x,r);CHKERRQ(ierr);
ierr = VecAXPY(r,-1.0,b);CHKERRQ(ierr);
ierr = VecNorm(r,NORM_2,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Residual norm %G\n",norm);CHKERRQ(ierr);
ierr = DMDAGetInfo(da, 0, &mx, &my, &mz, 0,0,0,0,0,0,0,0,0);CHKERRQ(ierr);
Hx = 1.0 / (PetscReal)(mx);
Hy = 1.0 / (PetscReal)(my);
Hz = 1.0 / (PetscReal)(mz);
ierr = DMDAGetCorners(da,&xs,&ys,&zs,&xm,&ym,&zm);CHKERRQ(ierr);
ierr = DMDAVecGetArray(da, x, &array);CHKERRQ(ierr);
for (k=zs; k<zs+zm; k++){
for (j=ys; j<ys+ym; j++){
for(i=xs; i<xs+xm; i++){
array[k][j][i] -=
PetscCosScalar(2*PETSC_PI*(((PetscReal)i+0.5)*Hx))*
PetscCosScalar(2*PETSC_PI*(((PetscReal)j+0.5)*Hy))*
PetscCosScalar(2*PETSC_PI*(((PetscReal)k+0.5)*Hz));
}
}
}
ierr = DMDAVecRestoreArray(da, x, &array);CHKERRQ(ierr);
ierr = VecAssemblyBegin(x);CHKERRQ(ierr);
ierr = VecAssemblyEnd(x);CHKERRQ(ierr);
ierr = VecNorm(x,NORM_INFINITY,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Error norm %g\n",norm);CHKERRQ(ierr);
ierr = VecNorm(x,NORM_1,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Error norm %g\n",norm/((PetscReal)(mx)*(PetscReal)(my)*(PetscReal)(mz)));CHKERRQ(ierr);
ierr = VecNorm(x,NORM_2,&norm);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD,"Error norm %g\n",norm/((PetscReal)(mx)*(PetscReal)(my)*(PetscReal)(mz)));CHKERRQ(ierr);
ierr = VecDestroy(&r);CHKERRQ(ierr);
ierr = KSPDestroy(&ksp);CHKERRQ(ierr);
ierr = DMDestroy(&da);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}
