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elpa
elpa
Commits
eafb6aca
Commit
eafb6aca
authored
May 31, 2017
by
Andreas Marek
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Relax bandwidth criterium for ELPA 2stage
parent
76f631b1
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src/elpa2/elpa2_template.X90
src/elpa2/elpa2_template.X90
+25
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src/elpa2/elpa2_template.X90
View file @
eafb6aca
...
...
@@ -288,15 +288,35 @@
if
(
obj
%
is_set
(
"bandwidth"
)
==
1
)
then
call
obj
%
get
(
"bandwidth"
,
nbw
)
if
(
(
nbw
==
0
)
.or.
(
mod
(
nbw
,
nblk
)
.ne.
0
)
)
then
if
(
nbw
==
0
)
then
if
(
wantDebug
)
then
write
(
error_unit
,
*
)
"Specified bandwidth has to be a multiple of blocksize: "
,
nbw
endif
print
*
,
"Specified bandwidth has to be a multiple of blocksize"
write
(
error_unit
,
*
)
"Specified bandwidth = 0; ELPA refuses to solve the eigenvalue problem "
,
&
"for a diagonal matrix! This is too simple"
endif
print
*
,
"Specified bandwidth = 0; ELPA refuses to solve the eigenvalue problem "
,
&
"for a diagonal matrix! This is too simple"
success
=
.false.
return
endif
if
(
mod
(
nbw
,
nblk
)
.ne.
0
)
then
! treat matrix with an effective bandwidth slightly bigger than specified bandwidth
! such that effective bandwidth is a multiply of nblk. which is a prerequiste for ELPA
nbw
=
nblk
*
ceiling
(
real
(
nbw
,
kind
=
c_double
)/
real
(
nblk
,
kind
=
c_double
))
! just check that effective bandwidth is NOT larger than matrix size
if
(
nbw
.gt.
na
)
then
if
(
wantDebug
)
then
write
(
error_unit
,
*
)
"Specified bandwidth "
,
nbw
,
" leads internaly to a computed bandwidth "
,
&
"which is larger than the matrix size "
,
na
,
" ! ELPA will abort! Try to"
,
&
"solve your problem by not specifing a bandwidth"
endif
print
*
,
"Specified bandwidth "
,
nbw
,
" leads internaly to a computed bandwidth "
,
&
"which is larger than the matrix size "
,
na
,
" ! ELPA will abort! Try to"
,
&
"solve your problem by not specifing a bandwidth"
success
=
.false.
return
endif
endif
do_bandred
=
.false.
! we already have a banded matrix
do_solve_tridi
=
.true.
! we also have to solve something :-)
do_trans_to_band
=
.true.
! and still we have to backsub to banded
...
...
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