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// Copyright (C) 2005-2018 Garth N. Wells
//
// This file is part of DOLFINx (https://www.fenicsproject.org)
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#ifdef HAS_SLEPC
#include "slepc.h"
#include "petsc.h"
#include "utils.h"
#include <dolfinx/common/MPI.h>
#include <dolfinx/common/log.h>
#include <petscmat.h>
#include <slepcversion.h>
using namespace dolfinx;
using namespace dolfinx::la;
//-----------------------------------------------------------------------------
SLEPcEigenSolver::SLEPcEigenSolver(MPI_Comm comm) { EPSCreate(comm, &_eps); }
//-----------------------------------------------------------------------------
SLEPcEigenSolver::SLEPcEigenSolver(EPS eps, bool inc_ref_count) : _eps(eps)
{
if (!eps)
throw std::runtime_error("SLEPc EPS must be initialised before wrapping");
PetscErrorCode ierr;
if (inc_ref_count)
{
ierr = PetscObjectReference((PetscObject)_eps);
if (ierr != 0)
petsc::error(ierr, __FILE__, "PetscObjectReference");
}
}
//-----------------------------------------------------------------------------
SLEPcEigenSolver::SLEPcEigenSolver(SLEPcEigenSolver&& solver) noexcept
: _eps(std::exchange(solver._eps, nullptr))
{
// Do nothing
}
//-----------------------------------------------------------------------------
SLEPcEigenSolver::~SLEPcEigenSolver()
{
if (_eps)
EPSDestroy(&_eps);
}
//-----------------------------------------------------------------------------
SLEPcEigenSolver&
SLEPcEigenSolver::operator=(SLEPcEigenSolver&& solver) noexcept
{
std::swap(_eps, solver._eps);
return *this;
}
//-----------------------------------------------------------------------------
void SLEPcEigenSolver::set_operators(const Mat A, const Mat B)
{
assert(_eps);
EPSSetOperators(_eps, A, B);
}
//-----------------------------------------------------------------------------
void SLEPcEigenSolver::solve()
{
// Get operators
Mat A, B;
assert(_eps);
EPSGetOperators(_eps, &A, &B);
PetscInt m(0), n(0);
MatGetSize(A, &m, &n);
solve(m);
}
//-----------------------------------------------------------------------------
void SLEPcEigenSolver::solve(std::int64_t n)
{
#ifndef NDEBUG
// Get operators
Mat A, B;
assert(_eps);
EPSGetOperators(_eps, &A, &B);
PetscInt _m(0), _n(0);
MatGetSize(A, &_m, &_n);
assert(n <= _n);
#endif
// Set number of eigenpairs to compute
assert(_eps);
EPSSetDimensions(_eps, n, PETSC_DECIDE, PETSC_DECIDE);
// Set any options from the PETSc database
EPSSetFromOptions(_eps);
// Solve eigenvalue problem
EPSSolve(_eps);
// Check for convergence
EPSConvergedReason reason;
EPSGetConvergedReason(_eps, &reason);
if (reason < 0)
spdlog::warn("Eigenvalue solver did not converge");
// Report solver status
PetscInt num_iterations = 0;
EPSGetIterationNumber(_eps, &num_iterations);
EPSType eps_type = nullptr;
EPSGetType(_eps, &eps_type);
spdlog::info("Eigenvalue solver ({}) converged in {} iterations.", eps_type,
num_iterations);
}
//-----------------------------------------------------------------------------
std::complex<PetscReal> SLEPcEigenSolver::get_eigenvalue(int i) const
{
assert(_eps);
// Get number of computed values
PetscInt num_computed_eigenvalues;
EPSGetConverged(_eps, &num_computed_eigenvalues);
if (i < num_computed_eigenvalues)
{
#ifdef PETSC_USE_COMPLEX
PetscScalar l;
EPSGetEigenvalue(_eps, i, &l, nullptr);
return l;
#else
PetscScalar lr, li;
EPSGetEigenvalue(_eps, i, &lr, &li);
return std::complex<PetscReal>(lr, li);
#endif
}
else
{
throw std::runtime_error("Requested eigenvalue (" + std::to_string(i)
+ ") has not been computed");
}
}
//-----------------------------------------------------------------------------
void SLEPcEigenSolver::get_eigenpair(PetscScalar& lr, PetscScalar& lc, Vec r,
Vec c, int i) const
{
assert(_eps);
PetscInt ii = static_cast<PetscInt>(i);
// Get number of computed eigenvectors/values
PetscInt num_computed_eigenvalues;
EPSGetConverged(_eps, &num_computed_eigenvalues);
if (ii < num_computed_eigenvalues)
EPSGetEigenpair(_eps, ii, &lr, &lc, r, c);
else
{
throw std::runtime_error("Requested eigenpair (" + std::to_string(i)
+ ") has not been computed");
}
}
//-----------------------------------------------------------------------------
std::int64_t SLEPcEigenSolver::get_number_converged() const
{
PetscInt num_conv;
assert(_eps);
EPSGetConverged(_eps, &num_conv);
return num_conv;
}
//-----------------------------------------------------------------------------
void SLEPcEigenSolver::set_options_prefix(const std::string& options_prefix)
{
assert(_eps);
PetscErrorCode ierr = EPSSetOptionsPrefix(_eps, options_prefix.c_str());
if (ierr != 0)
petsc::error(ierr, __FILE__, "EPSSetOptionsPrefix");
}
//-----------------------------------------------------------------------------
std::string SLEPcEigenSolver::get_options_prefix() const
{
assert(_eps);
const char* prefix = nullptr;
PetscErrorCode ierr = EPSGetOptionsPrefix(_eps, &prefix);
if (ierr != 0)
petsc::error(ierr, __FILE__, "EPSGetOptionsPrefix");
return std::string(prefix);
}
//-----------------------------------------------------------------------------
void SLEPcEigenSolver::set_from_options() const
{
assert(_eps);
PetscErrorCode ierr = EPSSetFromOptions(_eps);
if (ierr != 0)
petsc::error(ierr, __FILE__, "EPSSetFromOptions");
}
//-----------------------------------------------------------------------------
int SLEPcEigenSolver::get_iteration_number() const
{
assert(_eps);
PetscInt num_iter;
EPSGetIterationNumber(_eps, &num_iter);
return num_iter;
}
//-----------------------------------------------------------------------------
EPS SLEPcEigenSolver::eps() const { return _eps; }
//-----------------------------------------------------------------------------
MPI_Comm SLEPcEigenSolver::comm() const
{
assert(_eps);
MPI_Comm mpi_comm = MPI_COMM_NULL;
PetscObjectGetComm((PetscObject)_eps, &mpi_comm);
return mpi_comm;
}
//-----------------------------------------------------------------------------
#endif
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