syssolver_polyprec_cg.h

Go to the documentation of this file.

// -*- C++ -*-
/*! \file
 *  \brief Solve a PolyPrec*psi=chi linear system by CG1
 */
 
#ifndef __syssolver_polyprec_cg_h__
#define __syssolver_polyprec_cg_h__
 
#include "handle.h"
#include "syssolver.h"
#include "linearop.h"
#include "actions/ferm/invert/syssolver_polyprec.h"
#include "actions/ferm/invert/syssolver_cg_params.h"
#include "actions/ferm/invert/invcg1.h"
 
 
namespace Chroma
{
 
  //! CG system solver namespace
  namespace PolyPrecSysSolverCGEnv
  {
    //! Register the syssolver
    bool registerAll();
  }
 
 
  //! Solve a PolyPrec*psi=chi linear system by CG1
  /*! \ingroup invert
   */
  template<typename T>
  class PolyPrecSysSolverCG : public PolyPrecSystemSolver<T>
  {
  public:
    //! Constructor
    /*!
     * \param M_        Linear operator ( Read )
     * \param invParam  inverter parameters ( Read )
     */
    PolyPrecSysSolverCG(Handle< LinearOperator<T> > A_,
                        const SysSolverCGParams& invParam_) : 
      A(A_), invParam(invParam_) 
      {}
 
    //! Destructor is automatic
    ~PolyPrecSysSolverCG() {}
 
    //! Return the subset on which the operator acts
    const Subset& subset() const {return A->subset();}
 
    //! Solver the linear system
    /*!
     * \param psi      solution ( Modify )
     * \param chi      source ( Read )
     * \return syssolver results
     */
    SystemSolverResults_t operator() (T& psi, const T& chi) const
      {
        START_CODE();
 
        T chi_tmp;
        (*A)(chi_tmp, chi, MINUS);
 
        SystemSolverResults_t res = InvCG1(*A, chi_tmp, psi, invParam.RsdCG, invParam.MaxCG);
 
        END_CODE();
 
        return res;
      }
 
 
  private:
    // Hide default constructor
    PolyPrecSysSolverCG() {}
 
    Handle< LinearOperator<T> > A;
    SysSolverCGParams invParam;
  };
 
} // End namespace
 
#endif