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Add support for partial resetup with AMGX

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jakobtorben 2024-12-02 17:29:16 +01:00
parent 5dd70eb8bb
commit 0290fd0e9f
2 changed files with 23 additions and 4 deletions
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20
opm/simulators/linalg/AmgxPreconditioner.hpp
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@ -132,6 +132,9 @@ public:
AMGX_SAFE_CALL(AMGX_config_create(&cfg_, config.toString().c_str()));
AMGX_SAFE_CALL(AMGX_resources_create_simple(&rsrc_, cfg_));
// Setup frequency is set in the property tree
setup_frequency_ = prm.get<int>("setup_frequency", 30);
// Create solver and matrix/vector handles
AMGX_SAFE_CALL(AMGX_solver_create(&solver_, rsrc_, AMGX_mode_dDDI, cfg_));
AMGX_SAFE_CALL(AMGX_matrix_create(&A_amgx_, rsrc_, AMGX_mode_dDDI));
@ -236,7 +239,16 @@ public:
{
OPM_TIMEBLOCK(prec_update);
copyMatrixToAmgx();
if (update_counter_ == 0) {
AMGX_SAFE_CALL(AMGX_solver_setup(solver_, A_amgx_));
} else {
AMGX_SAFE_CALL(AMGX_solver_resetup(solver_, A_amgx_));
}
++update_counter_;
if (update_counter_ >= setup_frequency_) {
update_counter_ = 0;
}
}
/**
@ -256,8 +268,9 @@ public:
*/
bool hasPerfectUpdate() const override
{
// The Amgx preconditioner can depend on the values of the matrix, so it must be recreated
return false;
// The AMG hierarchy of the Amgx preconditioner can depend on the values of the matrix, so it must be recreated
// when the matrix values change, at given frequency. Since this is handled internally, we return true.
return true;
}
private:
@ -304,6 +317,9 @@ private:
const M& A_; //!< The matrix for which the preconditioner is constructed.
const int N_; //!< Number of rows in the matrix.
const int nnz_; //!< Number of non-zero elements in the matrix.
// Internal variables to control AMGX setup and reuse frequency
int setup_frequency_ = -1; //!< Frequency of updating the AMG hierarchy
int update_counter_ = 0; //!< Counter for setup updates.
AMGX_config_handle cfg_ = nullptr; //!< The AMGX configuration handle.
AMGX_resources_handle rsrc_ = nullptr; //!< The AMGX resources handle.

5
opm/simulators/linalg/PreconditionerFactory_impl.hpp
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@ -28,6 +28,7 @@
#include <opm/simulators/linalg/DILU.hpp>
#include <opm/simulators/linalg/ExtraSmoothers.hpp>
#include <opm/simulators/linalg/FlexibleSolver.hpp>
#include <opm/simulators/linalg/FlowLinearSolverParameters.hpp>
#include <opm/simulators/linalg/OwningBlockPreconditioner.hpp>
#include <opm/simulators/linalg/OwningTwoLevelPreconditioner.hpp>
#include <opm/simulators/linalg/ParallelOverlappingILU0.hpp>
@ -555,7 +556,9 @@ struct StandardPreconditioners<Operator, Dune::Amg::SequentialInformation> {
// Only add AMGX for scalar matrices
if constexpr (M::block_type::rows == 1 && M::block_type::cols == 1) {
F::addCreator("amgx", [](const O& op, const P& prm, const std::function<V()>&, std::size_t) {
return std::make_shared<Amgx::AmgxPreconditioner<M, V, V>>(op.getmat(), prm);
auto prm_copy = prm;
prm_copy.put("setup_frequency", Opm::Parameters::Get<Opm::Parameters::CprReuseInterval>());
return std::make_shared<Amgx::AmgxPreconditioner<M, V, V>>(op.getmat(), prm_copy);
});
}
#endif