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@ -36,72 +36,72 @@ Module psb_krylov_mod
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end interface
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interface psb_cg
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subroutine psb_dcg(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.d0)), intent(in) :: b(:)
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real(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_dprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_dcg
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subroutine psb_dcg(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.d0)), intent(in) :: b(:)
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real(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_dprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_dcg
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end interface
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interface psb_bicg
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subroutine psb_dbicg(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.d0)), intent(in) :: b(:)
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real(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_dprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_dbicg
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subroutine psb_dbicg(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.d0)), intent(in) :: b(:)
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real(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_dprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_dbicg
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end interface
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interface psb_bicgstab
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subroutine psb_dcgstab(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.d0)), intent(in) :: b(:)
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real(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_dprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_dcgstab
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subroutine psb_zcgstab(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_zspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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complex(kind(1.d0)), intent(in) :: b(:)
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complex(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_zprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_zcgstab
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subroutine psb_dcgstab(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_dspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.d0)), intent(in) :: b(:)
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real(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_dprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_dcgstab
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subroutine psb_zcgstab(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_zspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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complex(kind(1.d0)), intent(in) :: b(:)
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complex(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_zprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_zcgstab
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end interface
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interface psb_bicgstabl
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@ -171,25 +171,70 @@ Module psb_krylov_mod
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_dcgs
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subroutine psb_zcgs(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_zspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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complex(kind(1.d0)), intent(in) :: b(:)
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complex(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_zprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_zcgs
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subroutine psb_zcgs(a,prec,b,x,eps,&
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& desc_a,info,itmax,iter,err,itrace,istop)
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use psb_base_mod
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use psb_prec_mod
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type(psb_zspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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complex(kind(1.d0)), intent(in) :: b(:)
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complex(kind(1.d0)), intent(inout) :: x(:)
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real(kind(1.d0)), intent(in) :: eps
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type(psb_zprec_type), intent(in) :: prec
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integer, intent(out) :: info
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integer, optional, intent(in) :: itmax, itrace,istop
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integer, optional, intent(out) :: iter
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real(kind(1.d0)), optional, intent(out) :: err
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end subroutine psb_zcgs
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end interface
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contains
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contains
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!
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! File: psb_krylov_mod.f90
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!
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! Subroutine: psb_dkrylov
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!
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! Front-end for the Krylov subspace iterations, real version
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!
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! Arguments:
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!
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! methd - character The specific method; can take the values:
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! CG
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! CGS
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! BICG
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! BICGSTAB
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! BICGSTABL
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! RGMRES
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!
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! a - type(<psb_dspmat_type>) Input: sparse matrix containing A.
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! prec - type(<psb_dprec_type>) Input: preconditioner
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! b - real,dimension(:) Input: vector containing the
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! right hand side B
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! x - real,dimension(:) Input/Output: vector containing the
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! initial guess and final solution X.
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! eps - real Input: Stopping tolerance; the iteration is
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! stopped when the error estimate
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! |err| <= eps
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! desc_a - type(<psb_desc_type>). Input: The communication descriptor.
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! info - integer. Output: Return code
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!
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! itmax - integer(optional) Input: maximum number of iterations to be
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! performed.
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! iter - integer(optional) Output: how many iterations have been
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! performed.
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! err - real (optional) Output: error estimate on exit
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! itrace - integer(optional) Input: print an informational message
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! with the error estimate every itrace
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! iterations
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! irst - integer(optional) Input: restart parameter for RGMRES and
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! BICGSTAB(L) methods
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! istop - integer(optional) Input: stopping criterion, or how
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! to estimate the error.
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! 1: err = |r|/|b|
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! 2: err = |r|/(|a||x|+|b|)
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! where r is the (preconditioned, recursive
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! estimate of) residual
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!
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Subroutine psb_dkrylov(method,a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,irst,istop)
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@ -218,53 +263,96 @@ contains
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ictxt=psb_cd_get_context(desc_a)
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call psb_info(ictxt, me, np)
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select case(toupper(method))
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case('CG')
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call psb_cg(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,istop)
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&itmax,iter,err,itrace,istop)
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case('CGS')
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call psb_cgs(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,istop)
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&itmax,iter,err,itrace,istop)
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case('BICG')
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call psb_bicg(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,istop)
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&itmax,iter,err,itrace,istop)
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case('BICGSTAB')
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call psb_bicgstab(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,istop)
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&itmax,iter,err,itrace,istop)
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case('RGMRES')
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call psb_rgmres(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,irst,istop)
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&itmax,iter,err,itrace,irst,istop)
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case('BICGSTABL')
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call psb_bicgstabl(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,irst,istop)
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&itmax,iter,err,itrace,irst,istop)
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case default
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if (me==0) write(0,*) 'Warning: Unknown method ',method,&
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& ' in PSB_KRYLOV, defaulting to BiCGSTAB'
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call psb_bicgstab(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,istop)
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&itmax,iter,err,itrace,istop)
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end select
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if(info/=0) then
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call psb_errpush(info,name)
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goto 9999
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end if
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act.eq.psb_act_abort_) then
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call psb_error(ictxt)
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return
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end if
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end subroutine psb_dkrylov
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!
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! File: psb_krylov_mod.f90
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!
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! Subroutine: psb_zkrylov
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!
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! Front-end for the Krylov subspace iterations, complexversion
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!
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! Arguments:
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!
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! methd - character The specific method; can take the values:
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! CGS
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! BICGSTAB
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! RGMRES
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!
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! a - type(<psb_zspmat_type>) Input: sparse matrix containing A.
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! prec - type(<psb_zprec_type>) Input: preconditioner
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! b - complex,dimension(:) Input: vector containing the
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! right hand side B
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! x - complex,dimension(:) Input/Output: vector containing the
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! initial guess and final solution X.
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! eps - real Input: Stopping tolerance; the iteration is
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! stopped when the error estimate
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! |err| <= eps
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! desc_a - type(<psb_desc_type>). Input: The communication descriptor.
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! info - integer. Output: Return code
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!
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! itmax - integer(optional) Input: maximum number of iterations to be
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! performed.
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! iter - integer(optional) Output: how many iterations have been
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! performed.
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! err - real (optional) Output: error estimate on exit
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! itrace - integer(optional) Input: print an informational message
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! with the error estimate every itrace
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! iterations
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! irst - integer(optional) Input: restart parameter for RGMRES and
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! BICGSTAB(L) methods
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! istop - integer(optional) Input: stopping criterion, or how
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! to estimate the error.
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! 1: err = |r|/|b|
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! 2: err = |r|/(|a||x|+|b|)
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! where r is the (preconditioned, recursive
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! estimate of) residual
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!
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Subroutine psb_zkrylov(method,a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,irst,istop)
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use psb_base_mod
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@ -290,9 +378,9 @@ contains
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ictxt=psb_cd_get_context(desc_a)
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call psb_info(ictxt, me, np)
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select case(toupper(method))
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!!$ case('CG')
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@ -300,7 +388,7 @@ contains
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!!$ &itmax,iter,err,itrace,istop)
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case('CGS')
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call psb_cgs(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,istop)
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&itmax,iter,err,itrace,istop)
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!!$ case('BICG')
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!!$ call psb_bicg(a,prec,b,x,eps,desc_a,info,&
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!!$ &itmax,iter,err,itrace,istop)
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@ -317,24 +405,24 @@ contains
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if (me==0) write(0,*) 'Warning: Unknown method ',method,&
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& ' in PSB_KRYLOV, defaulting to BiCGSTAB'
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call psb_bicgstab(a,prec,b,x,eps,desc_a,info,&
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&itmax,iter,err,itrace,istop)
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&itmax,iter,err,itrace,istop)
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end select
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if(info/=0) then
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call psb_errpush(info,name)
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goto 9999
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end if
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act.eq.psb_act_abort_) then
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call psb_error(ictxt)
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return
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end if
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end subroutine psb_zkrylov
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