!!$
!!$ Parallel Sparse BLAS version 2.2
!!$ (C) Copyright 2006/2007/2008
!!$ Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$
!!$ Redistribution and use in source and binary forms, with or without
!!$ modification, are permitted provided that the following conditions
!!$ are met:
!!$ 1. Redistributions of source code must retain the above copyright
!!$ notice, this list of conditions and the following disclaimer.
!!$ 2. Redistributions in binary form must reproduce the above copyright
!!$ notice, this list of conditions, and the following disclaimer in the
!!$ documentation and/or other materials provided with the distribution.
!!$ 3. The name of the PSBLAS group or the names of its contributors may
!!$ not be used to endorse or promote products derived from this
!!$ software without specific written permission.
!!$
!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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!!$
!!$
! File: psb_cdalv.f90
!
! Subroutine: psb_cdalv
! Allocate descriptor by means of a global map vector V: index I
! is assigned to process V(I). It is assumed that V is identical
! on all calling processes.
!
!
! Arguments:
! v - integer, dimension(:). The array containg the partitioning scheme.
! ictxt - integer. The communication context.
! desc - type(psb_desc_type). The communication descriptor.
! info - integer. Return code
! flag - integer. Are V's contents 0- or 1-based?
subroutine psb_cdalv(v, ictxt, desc, info, flag)
use psb_sparse_mod
use psi_mod
implicit None
!....Parameters...
Integer, intent(in) :: ictxt, v(:)
integer, intent(in), optional :: flag
integer, intent(out) :: info
type(psb_desc_type), intent(out) :: desc
!locals
Integer :: counter,i,j,np,me,loc_row,err,&
& loc_col,nprocs,m,n,itmpov, k,glx,&
& l_ov_ix,l_ov_el,idx, flag_, err_act
integer :: int_err(5),exch(3)
Integer, allocatable :: temp_ovrlap(:)
integer :: debug_level, debug_unit
character(len=20) :: name
if(psb_get_errstatus() /= 0) return
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
info = 0
err = 0
name = 'psb_cdalv'
call psb_info(ictxt, me, np)
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': ',np,me
m = size(v)
n = m
!... check m and n parameters....
if (m < 1) then
info = 10
int_err(1) = 1
int_err(2) = m
else if (n < 1) then
info = 10
int_err(1) = 2
int_err(2) = n
else if (size(v)<m) then
info = 10
int_err(1) = 2
int_err(2) = size(v)
endif
if (info /= 0) then
call psb_errpush(info,name,i_err=int_err)
goto 9999
end if
if (me == psb_root_) then
exch(1)=m
exch(2)=n
exch(3)=psb_cd_get_large_threshold()
call psb_bcast(ictxt,exch(1:3),root=psb_root_)
else
call psb_bcast(ictxt,exch(1:3),root=psb_root_)
if (exch(1) /= m) then
err=550
int_err(1)=1
call psb_errpush(err,name,int_err)
goto 9999
else if (exch(2) /= n) then
err=550
int_err(1)=2
call psb_errpush(err,name,int_err)
goto 9999
endif
call psb_cd_set_large_threshold(exch(3))
endif
call psb_nullify_desc(desc)
if (present(flag)) then
flag_=flag
else
flag_=0
endif
if ((flag_<0).or.(flag_>1)) then
info = 6
err=info
call psb_errpush(info,name)
goto 9999
end if
! count local rows number
loc_row = max(1,(m+np-1)/np)
! allocate work vector
if (psb_cd_choose_large_state(ictxt,m)) then
allocate(desc%matrix_data(psb_mdata_size_),&
&temp_ovrlap(max(1,2*loc_row)),stat=info)
if (info == 0) then
desc%matrix_data(:) = 0
desc%idxmap%state = psb_desc_large_
end if
else
allocate(desc%idxmap%glob_to_loc(m),desc%matrix_data(psb_mdata_size_),&
&temp_ovrlap(max(1,2*loc_row)),stat=info)
if (info == 0) then
desc%matrix_data(:) = 0
desc%idxmap%state = psb_desc_normal_
end if
end if
if (info /= 0) then
info=4025
int_err(1)=2*m+psb_mdata_size_
call psb_errpush(info,name,i_err=int_err,a_err='integer')
goto 9999
endif
desc%matrix_data(psb_m_) = m
desc%matrix_data(psb_n_) = n
! This has to be set BEFORE any call to SET_BLD
desc%matrix_data(psb_ctxt_) = ictxt
call psb_get_mpicomm(ictxt,desc%matrix_data(psb_mpi_c_))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': starting main loop' ,info
counter = 0
itmpov = 0
temp_ovrlap(:) = -1
!
! We have to decide whether we have a "large" index space.
!
if (psb_cd_choose_large_state(ictxt,m)) then
!
! Yes, we do have a large index space. Therefore we are
! keeping on the local process a map of only the global
! indices ending up here; this map is stored in an AVL
! tree during the build stage, so as to guarantee log-time
! serch and insertion of new items. At assembly time it
! is transferred to a series of ordered linear lists,
! hashed by the low order bits of the entries.
!
do i=1,m
if (((v(i)-flag_) > np-1).or.((v(i)-flag_) < 0)) then
info=580
int_err(1)=3
int_err(2)=v(i) - flag_
int_err(3)=i
exit
end if
if ((v(i)-flag_) == me) then
! this point belongs to me
counter=counter+1
end if
enddo
loc_row=counter
! check on parts function
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': End main loop:' ,loc_row,itmpov,info
if (info /= 0) then
call psb_errpush(info,name,i_err=int_err)
goto 9999
end if
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': error check:' ,err
! estimate local cols number
loc_col = min(2*loc_row,m)
allocate(desc%idxmap%loc_to_glob(loc_col), desc%lprm(1),&
& stat=info)
if (info /= 0) then
info=4025
int_err(1)=loc_col
call psb_errpush(info,name,i_err=int_err,a_err='integer')
goto 9999
end if
! set LOC_TO_GLOB array to all "-1" values
desc%lprm(1) = 0
desc%idxmap%loc_to_glob(:) = -1
k = 0
do i=1,m
if ((v(i)-flag_) == me) then
k = k + 1
desc%idxmap%loc_to_glob(k) = i
endif
enddo
else
!
! No, we don't have a large index space. Therefore we can
! afford to keep on the local process a map of all global
! indices; for those we know are here we immediately store
! the corresponding local index, for the others we encode
! the index of the process owning them, so that during the
! insertion phase we can use the information to build the
! data exchange lists "on-the-fly".
!
do i=1,m
if (((v(i)-flag_) > np-1).or.((v(i)-flag_) < 0)) then
info=580
int_err(1)=3
int_err(2)=v(i) - flag_
int_err(3)=i
exit
end if
if ((v(i)-flag_) == me) then
! this point belongs to me
counter=counter+1
desc%idxmap%glob_to_loc(i) = counter
else
desc%idxmap%glob_to_loc(i) = -(np+(v(i)-flag_)+1)
end if
enddo
loc_row=counter
! check on parts function
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': End main loop:' ,loc_row,itmpov,info
if (info /= 0) then
call psb_errpush(info,name,i_err=int_err)
goto 9999
end if
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': error check:' ,err
! estimate local cols number
loc_col = min(2*loc_row,m)
allocate(desc%idxmap%loc_to_glob(loc_col),&
&desc%lprm(1),stat=info)
if (info /= 0) then
info=4025
int_err(1)=loc_col
call psb_errpush(info,name,i_err=int_err,a_err='integer')
goto 9999
end if
! set LOC_TO_GLOB array to all "-1" values
desc%lprm(1) = 0
desc%idxmap%loc_to_glob(:) = -1
do i=1,m
k = desc%idxmap%glob_to_loc(i)
if (k > 0) then
desc%idxmap%loc_to_glob(k) = i
endif
enddo
end if
call psi_bld_tmpovrl(temp_ovrlap,desc,info)
deallocate(temp_ovrlap,stat=info)
if (info /= 0) then
info=4000
call psb_errpush(info,name)
goto 9999
endif
! set fields in desc%MATRIX_DATA....
desc%matrix_data(psb_n_row_) = loc_row
desc%matrix_data(psb_n_col_) = loc_row
call psb_realloc(max(1,loc_row/2),desc%halo_index, info)
if (info == 0) call psb_realloc(1,desc%ext_index, info)
if (info /= 0) then
info=4010
call psb_errpush(info,name,a_err='psb_realloc')
Goto 9999
end if
desc%matrix_data(psb_pnt_h_) = 1
desc%halo_index(:) = -1
desc%ext_index(:) = -1
call psb_cd_set_bld(desc,info)
if (info /= 0) then
info=4010
call psb_errpush(info,name,a_err='psb_cd_set_bld')
Goto 9999
end if
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),': end'
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act == psb_act_abort_) then
call psb_error(ictxt)
return
end if
return
end subroutine psb_cdalv