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rLAMMPS lammps
neigh_half_multi.cpp
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#include "neighbor.h"
#include "neigh_list.h"
#include "atom.h"
#include "error.h"
using
namespace
LAMMPS_NS
;
/* ----------------------------------------------------------------------
binned neighbor list construction with partial Newton's 3rd law
each owned atom i checks own bin and other bins in stencil
multi-type stencil is itype dependent and is distance checked
pair stored once if i,j are both owned and i < j
pair stored by me if j is ghost (also stored by proc owning j)
------------------------------------------------------------------------- */
void
Neighbor
::
half_multi_no_newton
(
NeighList
*
list
)
{
int
i
,
j
,
k
,
n
,
itype
,
jtype
,
ibin
,
which
,
ns
;
double
xtmp
,
ytmp
,
ztmp
,
delx
,
dely
,
delz
,
rsq
;
int
*
neighptr
,
*
s
;
double
*
cutsq
,
*
distsq
;
// bin local & ghost atoms
bin_atoms
();
// loop over each atom, storing neighbors
int
**
special
=
atom
->
special
;
int
**
nspecial
=
atom
->
nspecial
;
int
*
tag
=
atom
->
tag
;
double
**
x
=
atom
->
x
;
int
*
type
=
atom
->
type
;
int
*
mask
=
atom
->
mask
;
int
*
molecule
=
atom
->
molecule
;
int
nlocal
=
atom
->
nlocal
;
int
molecular
=
atom
->
molecular
;
if
(
includegroup
)
nlocal
=
atom
->
nfirst
;
int
*
ilist
=
list
->
ilist
;
int
*
numneigh
=
list
->
numneigh
;
int
**
firstneigh
=
list
->
firstneigh
;
int
**
pages
=
list
->
pages
;
int
*
nstencil_multi
=
list
->
nstencil_multi
;
int
**
stencil_multi
=
list
->
stencil_multi
;
double
**
distsq_multi
=
list
->
distsq_multi
;
int
inum
=
0
;
int
npage
=
0
;
int
npnt
=
0
;
for
(
i
=
0
;
i
<
nlocal
;
i
++
)
{
if
(
pgsize
-
npnt
<
oneatom
)
{
npnt
=
0
;
npage
++
;
if
(
npage
==
list
->
maxpage
)
pages
=
list
->
add_pages
();
}
neighptr
=
&
pages
[
npage
][
npnt
];
n
=
0
;
itype
=
type
[
i
];
xtmp
=
x
[
i
][
0
];
ytmp
=
x
[
i
][
1
];
ztmp
=
x
[
i
][
2
];
// loop over all atoms in other bins in stencil including self
// only store pair if i < j
// skip if i,j neighbor cutoff is less than bin distance
// stores own/own pairs only once
// stores own/ghost pairs on both procs
ibin
=
coord2bin
(
x
[
i
]);
s
=
stencil_multi
[
itype
];
distsq
=
distsq_multi
[
itype
];
cutsq
=
cutneighsq
[
itype
];
ns
=
nstencil_multi
[
itype
];
for
(
k
=
0
;
k
<
ns
;
k
++
)
{
for
(
j
=
binhead
[
ibin
+
s
[
k
]];
j
>=
0
;
j
=
bins
[
j
])
{
if
(
j
<=
i
)
continue
;
jtype
=
type
[
j
];
if
(
cutsq
[
jtype
]
<
distsq
[
k
])
continue
;
if
(
exclude
&&
exclusion
(
i
,
j
,
itype
,
jtype
,
mask
,
molecule
))
continue
;
delx
=
xtmp
-
x
[
j
][
0
];
dely
=
ytmp
-
x
[
j
][
1
];
delz
=
ztmp
-
x
[
j
][
2
];
rsq
=
delx
*
delx
+
dely
*
dely
+
delz
*
delz
;
if
(
rsq
<=
cutneighsq
[
itype
][
jtype
])
{
if
(
molecular
)
{
which
=
find_special
(
special
[
i
],
nspecial
[
i
],
tag
[
j
]);
if
(
which
>=
0
)
neighptr
[
n
++
]
=
j
^
(
which
<<
SBBITS
);
}
else
neighptr
[
n
++
]
=
j
;
}
}
}
ilist
[
inum
++
]
=
i
;
firstneigh
[
i
]
=
neighptr
;
numneigh
[
i
]
=
n
;
npnt
+=
n
;
if
(
n
>
oneatom
)
error
->
one
(
FLERR
,
"Neighbor list overflow, boost neigh_modify one"
);
}
list
->
inum
=
inum
;
}
/* ----------------------------------------------------------------------
binned neighbor list construction with full Newton's 3rd law
each owned atom i checks its own bin and other bins in Newton stencil
multi-type stencil is itype dependent and is distance checked
every pair stored exactly once by some processor
------------------------------------------------------------------------- */
void
Neighbor
::
half_multi_newton
(
NeighList
*
list
)
{
int
i
,
j
,
k
,
n
,
itype
,
jtype
,
ibin
,
which
,
ns
;
double
xtmp
,
ytmp
,
ztmp
,
delx
,
dely
,
delz
,
rsq
;
int
*
neighptr
,
*
s
;
double
*
cutsq
,
*
distsq
;
// bin local & ghost atoms
bin_atoms
();
// loop over each atom, storing neighbors
int
**
special
=
atom
->
special
;
int
**
nspecial
=
atom
->
nspecial
;
int
*
tag
=
atom
->
tag
;
double
**
x
=
atom
->
x
;
int
*
type
=
atom
->
type
;
int
*
mask
=
atom
->
mask
;
int
*
molecule
=
atom
->
molecule
;
int
nlocal
=
atom
->
nlocal
;
int
molecular
=
atom
->
molecular
;
if
(
includegroup
)
nlocal
=
atom
->
nfirst
;
int
*
ilist
=
list
->
ilist
;
int
*
numneigh
=
list
->
numneigh
;
int
**
firstneigh
=
list
->
firstneigh
;
int
**
pages
=
list
->
pages
;
int
*
nstencil_multi
=
list
->
nstencil_multi
;
int
**
stencil_multi
=
list
->
stencil_multi
;
double
**
distsq_multi
=
list
->
distsq_multi
;
int
inum
=
0
;
int
npage
=
0
;
int
npnt
=
0
;
for
(
i
=
0
;
i
<
nlocal
;
i
++
)
{
if
(
pgsize
-
npnt
<
oneatom
)
{
npnt
=
0
;
npage
++
;
if
(
npage
==
list
->
maxpage
)
pages
=
list
->
add_pages
();
}
neighptr
=
&
pages
[
npage
][
npnt
];
n
=
0
;
itype
=
type
[
i
];
xtmp
=
x
[
i
][
0
];
ytmp
=
x
[
i
][
1
];
ztmp
=
x
[
i
][
2
];
// loop over rest of atoms in i's bin, ghosts are at end of linked list
// if j is owned atom, store it, since j is beyond i in linked list
// if j is ghost, only store if j coords are "above and to the right" of i
for
(
j
=
bins
[
i
];
j
>=
0
;
j
=
bins
[
j
])
{
if
(
j
>=
nlocal
)
{
if
(
x
[
j
][
2
]
<
ztmp
)
continue
;
if
(
x
[
j
][
2
]
==
ztmp
)
{
if
(
x
[
j
][
1
]
<
ytmp
)
continue
;
if
(
x
[
j
][
1
]
==
ytmp
&&
x
[
j
][
0
]
<
xtmp
)
continue
;
}
}
jtype
=
type
[
j
];
if
(
exclude
&&
exclusion
(
i
,
j
,
itype
,
jtype
,
mask
,
molecule
))
continue
;
delx
=
xtmp
-
x
[
j
][
0
];
dely
=
ytmp
-
x
[
j
][
1
];
delz
=
ztmp
-
x
[
j
][
2
];
rsq
=
delx
*
delx
+
dely
*
dely
+
delz
*
delz
;
if
(
rsq
<=
cutneighsq
[
itype
][
jtype
])
{
if
(
molecular
)
{
which
=
find_special
(
special
[
i
],
nspecial
[
i
],
tag
[
j
]);
if
(
which
>=
0
)
neighptr
[
n
++
]
=
j
^
(
which
<<
SBBITS
);
}
else
neighptr
[
n
++
]
=
j
;
}
}
// loop over all atoms in other bins in stencil, store every pair
// skip if i,j neighbor cutoff is less than bin distance
ibin
=
coord2bin
(
x
[
i
]);
s
=
stencil_multi
[
itype
];
distsq
=
distsq_multi
[
itype
];
cutsq
=
cutneighsq
[
itype
];
ns
=
nstencil_multi
[
itype
];
for
(
k
=
0
;
k
<
ns
;
k
++
)
{
for
(
j
=
binhead
[
ibin
+
s
[
k
]];
j
>=
0
;
j
=
bins
[
j
])
{
jtype
=
type
[
j
];
if
(
cutsq
[
jtype
]
<
distsq
[
k
])
continue
;
if
(
exclude
&&
exclusion
(
i
,
j
,
itype
,
jtype
,
mask
,
molecule
))
continue
;
delx
=
xtmp
-
x
[
j
][
0
];
dely
=
ytmp
-
x
[
j
][
1
];
delz
=
ztmp
-
x
[
j
][
2
];
rsq
=
delx
*
delx
+
dely
*
dely
+
delz
*
delz
;
if
(
rsq
<=
cutneighsq
[
itype
][
jtype
])
{
if
(
molecular
)
{
which
=
find_special
(
special
[
i
],
nspecial
[
i
],
tag
[
j
]);
if
(
which
>=
0
)
neighptr
[
n
++
]
=
j
^
(
which
<<
SBBITS
);
}
else
neighptr
[
n
++
]
=
j
;
}
}
}
ilist
[
inum
++
]
=
i
;
firstneigh
[
i
]
=
neighptr
;
numneigh
[
i
]
=
n
;
npnt
+=
n
;
if
(
n
>
oneatom
)
error
->
one
(
FLERR
,
"Neighbor list overflow, boost neigh_modify one"
);
}
list
->
inum
=
inum
;
}
/* ----------------------------------------------------------------------
binned neighbor list construction with Newton's 3rd law for triclinic
each owned atom i checks its own bin and other bins in triclinic stencil
multi-type stencil is itype dependent and is distance checked
every pair stored exactly once by some processor
------------------------------------------------------------------------- */
void
Neighbor
::
half_multi_newton_tri
(
NeighList
*
list
)
{
int
i
,
j
,
k
,
n
,
itype
,
jtype
,
ibin
,
which
,
ns
;
double
xtmp
,
ytmp
,
ztmp
,
delx
,
dely
,
delz
,
rsq
;
int
*
neighptr
,
*
s
;
double
*
cutsq
,
*
distsq
;
// bin local & ghost atoms
bin_atoms
();
// loop over each atom, storing neighbors
int
**
special
=
atom
->
special
;
int
**
nspecial
=
atom
->
nspecial
;
int
*
tag
=
atom
->
tag
;
double
**
x
=
atom
->
x
;
int
*
type
=
atom
->
type
;
int
*
mask
=
atom
->
mask
;
int
*
molecule
=
atom
->
molecule
;
int
nlocal
=
atom
->
nlocal
;
int
molecular
=
atom
->
molecular
;
if
(
includegroup
)
nlocal
=
atom
->
nfirst
;
int
*
ilist
=
list
->
ilist
;
int
*
numneigh
=
list
->
numneigh
;
int
**
firstneigh
=
list
->
firstneigh
;
int
**
pages
=
list
->
pages
;
int
*
nstencil_multi
=
list
->
nstencil_multi
;
int
**
stencil_multi
=
list
->
stencil_multi
;
double
**
distsq_multi
=
list
->
distsq_multi
;
int
inum
=
0
;
int
npage
=
0
;
int
npnt
=
0
;
for
(
i
=
0
;
i
<
nlocal
;
i
++
)
{
if
(
pgsize
-
npnt
<
oneatom
)
{
npnt
=
0
;
npage
++
;
if
(
npage
==
list
->
maxpage
)
pages
=
list
->
add_pages
();
}
neighptr
=
&
pages
[
npage
][
npnt
];
n
=
0
;
itype
=
type
[
i
];
xtmp
=
x
[
i
][
0
];
ytmp
=
x
[
i
][
1
];
ztmp
=
x
[
i
][
2
];
// loop over all atoms in bins, including self, in stencil
// skip if i,j neighbor cutoff is less than bin distance
// bins below self are excluded from stencil
// pairs for atoms j "below" i are excluded
// below = lower z or (equal z and lower y) or (equal zy and lower x)
// (equal zyx and j <= i)
// latter excludes self-self interaction but allows superposed atoms
ibin
=
coord2bin
(
x
[
i
]);
s
=
stencil_multi
[
itype
];
distsq
=
distsq_multi
[
itype
];
cutsq
=
cutneighsq
[
itype
];
ns
=
nstencil_multi
[
itype
];
for
(
k
=
0
;
k
<
ns
;
k
++
)
{
for
(
j
=
binhead
[
ibin
+
s
[
k
]];
j
>=
0
;
j
=
bins
[
j
])
{
jtype
=
type
[
j
];
if
(
cutsq
[
jtype
]
<
distsq
[
k
])
continue
;
if
(
x
[
j
][
2
]
<
ztmp
)
continue
;
if
(
x
[
j
][
2
]
==
ztmp
)
{
if
(
x
[
j
][
1
]
<
ytmp
)
continue
;
if
(
x
[
j
][
1
]
==
ytmp
)
{
if
(
x
[
j
][
0
]
<
xtmp
)
continue
;
if
(
x
[
j
][
0
]
==
xtmp
&&
j
<=
i
)
continue
;
}
}
if
(
exclude
&&
exclusion
(
i
,
j
,
itype
,
jtype
,
mask
,
molecule
))
continue
;
delx
=
xtmp
-
x
[
j
][
0
];
dely
=
ytmp
-
x
[
j
][
1
];
delz
=
ztmp
-
x
[
j
][
2
];
rsq
=
delx
*
delx
+
dely
*
dely
+
delz
*
delz
;
if
(
rsq
<=
cutneighsq
[
itype
][
jtype
])
{
if
(
molecular
)
{
which
=
find_special
(
special
[
i
],
nspecial
[
i
],
tag
[
j
]);
if
(
which
>=
0
)
neighptr
[
n
++
]
=
j
^
(
which
<<
SBBITS
);
}
else
neighptr
[
n
++
]
=
j
;
}
}
}
ilist
[
inum
++
]
=
i
;
firstneigh
[
i
]
=
neighptr
;
numneigh
[
i
]
=
n
;
npnt
+=
n
;
if
(
n
>
oneatom
)
error
->
one
(
FLERR
,
"Neighbor list overflow, boost neigh_modify one"
);
}
list
->
inum
=
inum
;
}
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