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mld2p4-2:

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mlprec/mld_d_as_smoother.f03

Shortcut for OVR==0 SWEEPS==1
This commit is contained in:
Salvatore Filippone
2009-12-10 12:35:42 +00:00
parent 88e27fb869
commit 97a6047c7e
1 changed files with 188 additions and 170 deletions
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mlprec/mld_d_as_smoother.f03
+188 -170
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@@ -115,6 +115,7 @@ contains
goto 9999
end if
n_row = psb_cd_get_local_rows(sm%desc_data)
n_col = psb_cd_get_local_cols(sm%desc_data)
nrow_d = psb_cd_get_local_rows(desc_data)
@@ -153,158 +154,27 @@ contains
endif
tx(1:nrow_d) = x(1:nrow_d)
tx(nrow_d+1:isz) = dzero
if (sm%sweeps == 1) then
select case(trans_)
case('N')
!
! Get the overlap entries of tx (tx==x)
!
if (sm%restr==psb_halo_) then
call psb_halo(tx,sm%desc_data,info,work=aux,data=psb_comm_ext_)
if(info /=0) then
info=4010
ch_err='psb_halo'
goto 9999
end if
else if (sm%restr /= psb_none_) then
call psb_errpush(4001,name,a_err='Invalid mld_sub_restr_')
goto 9999
end if
case('T','C')
!
! With transpose, we have to do it here
!
select case (sm%prol)
case(psb_none_)
!
! Do nothing
case(psb_sum_)
!
! The transpose of sum is halo
!
call psb_halo(tx,sm%desc_data,info,work=aux,data=psb_comm_ext_)
if(info /=0) then
info=4010
ch_err='psb_halo'
goto 9999
end if
case(psb_avg_)
!
! Tricky one: first we have to scale the overlap entries,
! which we can do by assignind mode=0, i.e. no communication
! (hence only scaling), then we do the halo
!
call psb_ovrl(tx,sm%desc_data,info,&
& update=psb_avg_,work=aux,mode=0)
if(info /=0) then
info=4010
ch_err='psb_ovrl'
goto 9999
end if
call psb_halo(tx,sm%desc_data,info,work=aux,data=psb_comm_ext_)
if(info /=0) then
info=4010
ch_err='psb_halo'
goto 9999
end if
case default
call psb_errpush(4001,name,a_err='Invalid mld_sub_prol_')
goto 9999
end select
case default
info=40
int_err(1)=6
ch_err(2:2)=trans
goto 9999
end select
call sm%sv%apply(done,tx,dzero,ty,sm%desc_data,trans_,aux,info)
if ((sm%novr == 0).and.(sm%sweeps == 1)) then
!
! Shortcut: in this case it's just the same
! as Block Jacobi.
!
call sm%sv%apply(alpha,x,beta,y,desc_data,trans_,aux,info)
if (info /= 0) then
call psb_errpush(4001,name,a_err='Error in sub_aply Jacobi Sweeps = 1')
goto 9999
endif
select case(trans_)
case('N')
select case (sm%prol)
case(psb_none_)
!
! Would work anyway, but since it is supposed to do nothing ...
! call psb_ovrl(ty,sm%desc_data,info,&
! & update=sm%prol,work=aux)
else
case(psb_sum_,psb_avg_)
!
! Update the overlap of ty
!
call psb_ovrl(ty,sm%desc_data,info,&
& update=sm%prol,work=aux)
if(info /=0) then
info=4010
ch_err='psb_ovrl'
goto 9999
end if
case default
call psb_errpush(4001,name,a_err='Invalid mld_sub_prol_')
goto 9999
end select
case('T','C')
!
! With transpose, we have to do it here
!
if (sm%restr == psb_halo_) then
call psb_ovrl(ty,sm%desc_data,info,&
& update=psb_sum_,work=aux)
if(info /=0) then
info=4010
ch_err='psb_ovrl'
goto 9999
end if
else if (sm%restr /= psb_none_) then
call psb_errpush(4001,name,a_err='Invalid mld_sub_restr_')
goto 9999
end if
case default
info=40
int_err(1)=6
ch_err(2:2)=trans
goto 9999
end select
tx(1:nrow_d) = x(1:nrow_d)
tx(nrow_d+1:isz) = dzero
if (sm%sweeps == 1) then
else if (sm%sweeps > 1) then
!
!
! Apply prec%iprcparm(mld_smoother_sweeps_) sweeps of a block-Jacobi solver
! to compute an approximate solution of a linear system.
!
!
ty = dzero
do i=1, sm%sweeps
select case(trans_)
case('N')
!
@@ -377,20 +247,14 @@ contains
ch_err(2:2)=trans
goto 9999
end select
!
! Compute Y(j+1) = D^(-1)*(X-ND*Y(j)), where D and ND are the
! block diagonal part and the remaining part of the local matrix
! and Y(j) is the approximate solution at sweep j.
!
ww(1:n_row) = tx(1:n_row)
call psb_spmm(-done,sm%nd,tx,done,ww,sm%desc_data,info,work=aux,trans=trans_)
if (info /=0) exit
call sm%sv%apply(done,ww,dzero,ty,sm%desc_data,trans_,aux,info)
if (info /=0) exit
call sm%sv%apply(done,tx,dzero,ty,sm%desc_data,trans_,aux,info)
if (info /= 0) then
call psb_errpush(4001,name,a_err='Error in sub_aply Jacobi Sweeps = 1')
goto 9999
endif
select case(trans_)
case('N')
@@ -444,30 +308,184 @@ contains
ch_err(2:2)=trans
goto 9999
end select
end do
if (info /= 0) then
info=4001
call psb_errpush(info,name,a_err='subsolve with Jacobi sweeps > 1')
goto 9999
else if (sm%sweeps > 1) then
!
!
! Apply prec%iprcparm(mld_smoother_sweeps_) sweeps of a block-Jacobi solver
! to compute an approximate solution of a linear system.
!
!
ty = dzero
do i=1, sm%sweeps
select case(trans_)
case('N')
!
! Get the overlap entries of tx (tx==x)
!
if (sm%restr==psb_halo_) then
call psb_halo(tx,sm%desc_data,info,work=aux,data=psb_comm_ext_)
if(info /=0) then
info=4010
ch_err='psb_halo'
goto 9999
end if
else if (sm%restr /= psb_none_) then
call psb_errpush(4001,name,a_err='Invalid mld_sub_restr_')
goto 9999
end if
case('T','C')
!
! With transpose, we have to do it here
!
select case (sm%prol)
case(psb_none_)
!
! Do nothing
case(psb_sum_)
!
! The transpose of sum is halo
!
call psb_halo(tx,sm%desc_data,info,work=aux,data=psb_comm_ext_)
if(info /=0) then
info=4010
ch_err='psb_halo'
goto 9999
end if
case(psb_avg_)
!
! Tricky one: first we have to scale the overlap entries,
! which we can do by assignind mode=0, i.e. no communication
! (hence only scaling), then we do the halo
!
call psb_ovrl(tx,sm%desc_data,info,&
& update=psb_avg_,work=aux,mode=0)
if(info /=0) then
info=4010
ch_err='psb_ovrl'
goto 9999
end if
call psb_halo(tx,sm%desc_data,info,work=aux,data=psb_comm_ext_)
if(info /=0) then
info=4010
ch_err='psb_halo'
goto 9999
end if
case default
call psb_errpush(4001,name,a_err='Invalid mld_sub_prol_')
goto 9999
end select
case default
info=40
int_err(1)=6
ch_err(2:2)=trans
goto 9999
end select
!
! Compute Y(j+1) = D^(-1)*(X-ND*Y(j)), where D and ND are the
! block diagonal part and the remaining part of the local matrix
! and Y(j) is the approximate solution at sweep j.
!
ww(1:n_row) = tx(1:n_row)
call psb_spmm(-done,sm%nd,tx,done,ww,sm%desc_data,info,work=aux,trans=trans_)
if (info /=0) exit
call sm%sv%apply(done,ww,dzero,ty,sm%desc_data,trans_,aux,info)
if (info /=0) exit
select case(trans_)
case('N')
select case (sm%prol)
case(psb_none_)
!
! Would work anyway, but since it is supposed to do nothing ...
! call psb_ovrl(ty,sm%desc_data,info,&
! & update=sm%prol,work=aux)
case(psb_sum_,psb_avg_)
!
! Update the overlap of ty
!
call psb_ovrl(ty,sm%desc_data,info,&
& update=sm%prol,work=aux)
if(info /=0) then
info=4010
ch_err='psb_ovrl'
goto 9999
end if
case default
call psb_errpush(4001,name,a_err='Invalid mld_sub_prol_')
goto 9999
end select
case('T','C')
!
! With transpose, we have to do it here
!
if (sm%restr == psb_halo_) then
call psb_ovrl(ty,sm%desc_data,info,&
& update=psb_sum_,work=aux)
if(info /=0) then
info=4010
ch_err='psb_ovrl'
goto 9999
end if
else if (sm%restr /= psb_none_) then
call psb_errpush(4001,name,a_err='Invalid mld_sub_restr_')
goto 9999
end if
case default
info=40
int_err(1)=6
ch_err(2:2)=trans
goto 9999
end select
end do
if (info /= 0) then
info=4001
call psb_errpush(info,name,a_err='subsolve with Jacobi sweeps > 1')
goto 9999
end if
else
info = 10
call psb_errpush(info,name,&
& i_err=(/2,sm%sweeps,0,0,0/))
goto 9999
end if
else
info = 10
call psb_errpush(info,name,&
& i_err=(/2,sm%sweeps,0,0,0/))
goto 9999
!
! Compute y = beta*y + alpha*ty (ty==K^(-1)*tx)
!
call psb_geaxpby(alpha,ty,beta,y,desc_data,info)
end if
!
! Compute y = beta*y + alpha*ty (ty==K^(-1)*tx)
!
call psb_geaxpby(alpha,ty,beta,y,desc_data,info)
if ((6*isz) <= size(work)) then
else if ((4*isz) <= size(work)) then