Skip to content
Snippets Groups Projects
Commit c60ae585 authored by Thomas Witkowski's avatar Thomas Witkowski
Browse files

Some performance issues in FETI-DP code.

parent e80c79ac
No related branches found
No related tags found
No related merge requests found
Hide whitespace changes
Inline Side-by-side
AMDiS/src/parallel/PetscSolverFeti.cc
+ 37
− 41
View file @ c60ae585
......@@ -27,7 +27,7 @@ namespace AMDiS {
void *ctx;
MatShellGetContext(mat, &ctx);
PetscSchurPrimalData* data = static_cast<PetscSchurPrimalData*>(ctx);
SchurPrimalData* data = static_cast<SchurPrimalData*>(ctx);
MatMult(*(data->mat_b_primal), x, data->tmp_vec_b);
KSPSolve(*(data->ksp_b), data->tmp_vec_b, data->tmp_vec_b);
......@@ -43,28 +43,25 @@ namespace AMDiS {
// y = mat * x
int petscMultMatFeti(Mat mat, Vec x, Vec y)
{
// F = L inv(K_BB) trans(L) + L inv(K_BB) K_BPi inv(S_PiPi) K_PiB inv(K_BB) trans(L)
// F = L inv(K_BB) trans(L) + L inv(K_BB) K_BPi inv(S_PiPi) K_PiB inv(K_BB) trans(L)
// => F = L [I + inv(K_BB) K_BPi inv(S_PiPi) K_PiB] inv(K_BB) trans(L)
void *ctx;
MatShellGetContext(mat, &ctx);
FetiData* data = static_cast<FetiData*>(ctx);
// y = L inv(K_BB) trans(L) x
MatMultTranspose(*(data->mat_lagrange), x, data->tmp_vec_b);
KSPSolve(*(data->ksp_b), data->tmp_vec_b, data->tmp_vec_b);
MatMult(*(data->mat_lagrange), data->tmp_vec_b, y);
// tmp_vec_b0 = inv(K_BB) trans(L) x
MatMultTranspose(*(data->mat_lagrange), x, data->tmp_vec_b0);
KSPSolve(*(data->ksp_b), data->tmp_vec_b0, data->tmp_vec_b0);
// tmp_vec_primal = inv(S_PiPi) K_PiB inv(K_BB) trans(L)
MatMult(*(data->mat_primal_b), data->tmp_vec_b, data->tmp_vec_primal);
// tmp_vec_b1 = inv(K_BB) K_BPi inv(S_PiPi) K_PiB tmp_vec_b0
MatMult(*(data->mat_primal_b), data->tmp_vec_b0, data->tmp_vec_primal);
KSPSolve(*(data->ksp_schur_primal), data->tmp_vec_primal, data->tmp_vec_primal);
MatMult(*(data->mat_b_primal), data->tmp_vec_primal, data->tmp_vec_b1);
// tmp_vec_lagrange = L inv(K_BB) K_BPi tmp_vec_primal
// = L inv(K_BB) K_BPi inv(S_PiPi) K_PiB inv(K_BB) trans(L)
MatMult(*(data->mat_b_primal), data->tmp_vec_primal, data->tmp_vec_b);
KSPSolve(*(data->ksp_b), data->tmp_vec_b, data->tmp_vec_b);
MatMult(*(data->mat_lagrange), data->tmp_vec_b, data->tmp_vec_lagrange);
VecAXPBY(y, 1.0, 1.0, data->tmp_vec_lagrange);
// y = L (tmp_vec_b0 + tmp_vec_b1)
VecAXPBY(data->tmp_vec_b0, 1.0, 1.0, data->tmp_vec_b1);
MatMult(*(data->mat_lagrange), data->tmp_vec_b0, y);
return 0;
}
......@@ -593,18 +590,18 @@ namespace AMDiS {
{
FUNCNAME("PetscSolverFeti::createSchurPrimal()");
petscSchurPrimalData.mat_primal_primal = &mat_primal_primal;
petscSchurPrimalData.mat_primal_b = &mat_primal_b;
petscSchurPrimalData.mat_b_primal = &mat_b_primal;
petscSchurPrimalData.ksp_b = &ksp_b;
schurPrimalData.mat_primal_primal = &mat_primal_primal;
schurPrimalData.mat_primal_b = &mat_primal_b;
schurPrimalData.mat_b_primal = &mat_b_primal;
schurPrimalData.ksp_b = &ksp_b;
VecDuplicate(f_b, &(petscSchurPrimalData.tmp_vec_b));
VecDuplicate(f_primal, &(petscSchurPrimalData.tmp_vec_primal));
VecDuplicate(f_b, &(schurPrimalData.tmp_vec_b));
VecDuplicate(f_primal, &(schurPrimalData.tmp_vec_primal));
MatCreateShell(PETSC_COMM_WORLD,
nRankPrimals * nComponents, nRankPrimals * nComponents,
nOverallPrimals * nComponents, nOverallPrimals * nComponents,
&petscSchurPrimalData,
&schurPrimalData,
&mat_schur_primal);
MatShellSetOperation(mat_schur_primal, MATOP_MULT,
(void(*)(void))petscMultMatSchurPrimal);
......@@ -620,13 +617,13 @@ namespace AMDiS {
{
FUNCNAME("PetscSolverFeti::destroySchurPrimal()");
petscSchurPrimalData.mat_primal_primal = PETSC_NULL;
petscSchurPrimalData.mat_primal_b = PETSC_NULL;
petscSchurPrimalData.mat_b_primal = PETSC_NULL;
petscSchurPrimalData.ksp_b = PETSC_NULL;
schurPrimalData.mat_primal_primal = PETSC_NULL;
schurPrimalData.mat_primal_b = PETSC_NULL;
schurPrimalData.mat_b_primal = PETSC_NULL;
schurPrimalData.ksp_b = PETSC_NULL;
VecDestroy(&petscSchurPrimalData.tmp_vec_b);
VecDestroy(&petscSchurPrimalData.tmp_vec_primal);
VecDestroy(&schurPrimalData.tmp_vec_b);
VecDestroy(&schurPrimalData.tmp_vec_primal);
MatDestroy(&mat_schur_primal);
KSPDestroy(&ksp_schur_primal);
......@@ -646,11 +643,9 @@ namespace AMDiS {
fetiData.ksp_b = &ksp_b;
fetiData.ksp_schur_primal = &ksp_schur_primal;
VecDuplicate(f_b, &(fetiData.tmp_vec_b));
VecDuplicate(f_b, &(fetiData.tmp_vec_b0));
VecDuplicate(f_b, &(fetiData.tmp_vec_b1));
VecDuplicate(f_primal, &(fetiData.tmp_vec_primal));
MatGetVecs(mat_lagrange, PETSC_NULL, &(fetiData.tmp_vec_lagrange));
MatCreateShell(PETSC_COMM_WORLD,
nRankLagrange * nComponents, nRankLagrange * nComponents,
......@@ -729,10 +724,9 @@ namespace AMDiS {
fetiData.ksp_b = PETSC_NULL;
fetiData.ksp_schur_primal = PETSC_NULL;
VecDestroy(&fetiData.tmp_vec_b);
VecDestroy(&fetiData.tmp_vec_b0);
VecDestroy(&fetiData.tmp_vec_b1);
VecDestroy(&fetiData.tmp_vec_primal);
VecDestroy(&fetiData.tmp_vec_lagrange);
MatDestroy(&mat_feti);
KSPDestroy(&ksp_feti);
......@@ -1391,17 +1385,19 @@ namespace AMDiS {
// === Create new rhs ===
// vec_rhs = L * inv(K_BB) * f_b
// d = L inv(K_BB) f_B - L inv(K_BB) K_BPi inv(S_PiPi) [f_Pi - K_PiB inv(K_BB) f_B]
// vec_rhs = L * inv(K_BB) * f_B
KSPSolve(ksp_b, f_b, tmp_b0);
MatMult(mat_lagrange, tmp_b0, vec_rhs);
// tmp_primal0 = M_PiB * inv(K_BB) * f_b
// tmp_primal0 = M_PiB * inv(K_BB) * f_B
MatMult(mat_primal_b, tmp_b0, tmp_primal0);
// tmp_primal0 = f_Pi - M_PiB * inv(K_BB) * f_b
VecAXPBY(tmp_primal0, -1.0, 1.0, f_primal);
// tmp_primal0 = f_Pi - M_PiB * inv(K_BB) * f_B
VecAXPBY(tmp_primal0, 1.0, -1.0, f_primal);
// tmp_primal0 = inv(S_PiPi) (f_Pi - M_PiB * inv(K_BB) * f_b)
// tmp_primal0 = inv(S_PiPi) (f_Pi - M_PiB * inv(K_BB) * f_B)
KSPSolve(ksp_schur_primal, tmp_primal0, tmp_primal0);
//
......@@ -1410,7 +1406,7 @@ namespace AMDiS {
MatMult(mat_lagrange, tmp_b0, tmp_lagrange0);
//
VecAXPBY(vec_rhs, 1.0, 1.0, tmp_lagrange0);
VecAXPBY(vec_rhs, -1.0, 1.0, tmp_lagrange0);
// === Solve with FETI-DP operator. ===
......
AMDiS/src/parallel/PetscSolverFeti.h
+ 4
− 7
View file @ c60ae585
......@@ -37,7 +37,7 @@ namespace AMDiS {
* This structure is used when defining the MatShell operation for solving
* primal schur complement. \ref petscMultMatSchurPrimal
*/
struct PetscSchurPrimalData {
struct SchurPrimalData {
/// Pointers to the matrix containing the primal variables.
Mat *mat_primal_primal;
......@@ -70,15 +70,12 @@ namespace AMDiS {
/// Matrix of Lagrange variables.
Mat *mat_lagrange;
/// Temporal vector on the B variables.
Vec tmp_vec_b;
/// Temporal vectors on the B variables.
Vec tmp_vec_b0, tmp_vec_b1;
/// Temporal vector on the primal variables.
Vec tmp_vec_primal;
/// Temporal vector on the Lagrange variables.
Vec tmp_vec_lagrange;
/// Pointer to the solver for \ref PetscSolverFeti::mat_bb.
KSP *ksp_b;
......@@ -293,7 +290,7 @@ namespace AMDiS {
Mat mat_schur_primal;
/// Data for MatMult operation in matrix \ref mat_schur_primal
PetscSchurPrimalData petscSchurPrimalData;
SchurPrimalData schurPrimalData;
/// PETSc solver object to solve a system with FETI-DP.
KSP ksp_feti;
......
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment