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lammps.py
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rLAMMPS lammps
lammps.py
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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.
# -------------------------------------------------------------------------
# Python wrapper on LAMMPS library via ctypes
import
sys
,
traceback
,
types
from
ctypes
import
*
from
os.path
import
dirname
,
abspath
,
join
from
inspect
import
getsourcefile
from
collections
import
namedtuple
import
os
import
select
import
re
class
lammps
:
# detect if Python is using version of mpi4py that can pass a communicator
has_mpi4py_v2
=
False
try
:
from
mpi4py
import
MPI
from
mpi4py
import
__version__
as
mpi4py_version
if
mpi4py_version
.
split
(
'.'
)[
0
]
==
'2'
:
has_mpi4py_v2
=
True
except
:
pass
# create instance of LAMMPS
def
__init__
(
self
,
name
=
""
,
cmdargs
=
None
,
ptr
=
None
,
comm
=
None
):
# determine module location
modpath
=
dirname
(
abspath
(
getsourcefile
(
lambda
:
0
)))
# load liblammps.so unless name is given.
# e.g. if name = "g++", load liblammps_g++.so
# try loading the LAMMPS shared object from the location
# of lammps.py with an absolute path (so that LD_LIBRARY_PATH
# does not need to be set for regular installations.
# fall back to loading with a relative path, which typically
# requires LD_LIBRARY_PATH to be set appropriately.
try
:
if
not
name
:
self
.
lib
=
CDLL
(
join
(
modpath
,
"liblammps.so"
),
RTLD_GLOBAL
)
else
:
self
.
lib
=
CDLL
(
join
(
modpath
,
"liblammps_
%s
.so"
%
name
),
RTLD_GLOBAL
)
except
:
if
not
name
:
self
.
lib
=
CDLL
(
"liblammps.so"
,
RTLD_GLOBAL
)
else
:
self
.
lib
=
CDLL
(
"liblammps_
%s
.so"
%
name
,
RTLD_GLOBAL
)
# if no ptr provided, create an instance of LAMMPS
# don't know how to pass an MPI communicator from PyPar
# but we can pass an MPI communicator from mpi4py v2.0.0 and later
# no_mpi call lets LAMMPS use MPI_COMM_WORLD
# cargs = array of C strings from args
# if ptr, then are embedding Python in LAMMPS input script
# ptr is the desired instance of LAMMPS
# just convert it to ctypes ptr and store in self.lmp
if
not
ptr
:
# with mpi4py v2, can pass MPI communicator to LAMMPS
# need to adjust for type of MPI communicator object
# allow for int (like MPICH) or void* (like OpenMPI)
if
lammps
.
has_mpi4py_v2
and
comm
!=
None
:
if
lammps
.
MPI
.
_sizeof
(
lammps
.
MPI
.
Comm
)
==
sizeof
(
c_int
):
MPI_Comm
=
c_int
else
:
MPI_Comm
=
c_void_p
narg
=
0
cargs
=
0
if
cmdargs
:
cmdargs
.
insert
(
0
,
"lammps.py"
)
narg
=
len
(
cmdargs
)
cargs
=
(
c_char_p
*
narg
)(
*
cmdargs
)
self
.
lib
.
lammps_open
.
argtypes
=
[
c_int
,
c_char_p
*
narg
,
\
MPI_Comm
,
c_void_p
()]
else
:
self
.
lib
.
lammps_open
.
argtypes
=
[
c_int
,
c_int
,
\
MPI_Comm
,
c_void_p
()]
self
.
lib
.
lammps_open
.
restype
=
None
self
.
opened
=
1
self
.
lmp
=
c_void_p
()
comm_ptr
=
lammps
.
MPI
.
_addressof
(
comm
)
comm_val
=
MPI_Comm
.
from_address
(
comm_ptr
)
self
.
lib
.
lammps_open
(
narg
,
cargs
,
comm_val
,
byref
(
self
.
lmp
))
else
:
self
.
opened
=
1
if
cmdargs
:
cmdargs
.
insert
(
0
,
"lammps.py"
)
narg
=
len
(
cmdargs
)
cargs
=
(
c_char_p
*
narg
)(
*
cmdargs
)
self
.
lmp
=
c_void_p
()
self
.
lib
.
lammps_open_no_mpi
(
narg
,
cargs
,
byref
(
self
.
lmp
))
else
:
self
.
lmp
=
c_void_p
()
self
.
lib
.
lammps_open_no_mpi
(
0
,
None
,
byref
(
self
.
lmp
))
# could use just this if LAMMPS lib interface supported it
# self.lmp = self.lib.lammps_open_no_mpi(0,None)
else
:
self
.
opened
=
0
# magic to convert ptr to ctypes ptr
pythonapi
.
PyCObject_AsVoidPtr
.
restype
=
c_void_p
pythonapi
.
PyCObject_AsVoidPtr
.
argtypes
=
[
py_object
]
self
.
lmp
=
c_void_p
(
pythonapi
.
PyCObject_AsVoidPtr
(
ptr
))
def
__del__
(
self
):
if
self
.
lmp
and
self
.
opened
:
self
.
lib
.
lammps_close
(
self
.
lmp
)
def
close
(
self
):
if
self
.
opened
:
self
.
lib
.
lammps_close
(
self
.
lmp
)
self
.
lmp
=
None
def
version
(
self
):
return
self
.
lib
.
lammps_version
(
self
.
lmp
)
def
file
(
self
,
file
):
file
=
file
.
encode
()
self
.
lib
.
lammps_file
(
self
.
lmp
,
file
)
def
command
(
self
,
cmd
):
cmd
=
cmd
.
encode
()
self
.
lib
.
lammps_command
(
self
.
lmp
,
cmd
)
def
extract_global
(
self
,
name
,
type
):
name
=
name
.
encode
()
if
type
==
0
:
self
.
lib
.
lammps_extract_global
.
restype
=
POINTER
(
c_int
)
elif
type
==
1
:
self
.
lib
.
lammps_extract_global
.
restype
=
POINTER
(
c_double
)
else
:
return
None
ptr
=
self
.
lib
.
lammps_extract_global
(
self
.
lmp
,
name
)
return
ptr
[
0
]
def
extract_atom
(
self
,
name
,
type
):
name
=
name
.
encode
()
if
type
==
0
:
self
.
lib
.
lammps_extract_atom
.
restype
=
POINTER
(
c_int
)
elif
type
==
1
:
self
.
lib
.
lammps_extract_atom
.
restype
=
POINTER
(
POINTER
(
c_int
))
elif
type
==
2
:
self
.
lib
.
lammps_extract_atom
.
restype
=
POINTER
(
c_double
)
elif
type
==
3
:
self
.
lib
.
lammps_extract_atom
.
restype
=
POINTER
(
POINTER
(
c_double
))
else
:
return
None
ptr
=
self
.
lib
.
lammps_extract_atom
(
self
.
lmp
,
name
)
return
ptr
def
extract_compute
(
self
,
id
,
style
,
type
):
id
=
id
.
encode
()
if
type
==
0
:
if
style
>
0
:
return
None
self
.
lib
.
lammps_extract_compute
.
restype
=
POINTER
(
c_double
)
ptr
=
self
.
lib
.
lammps_extract_compute
(
self
.
lmp
,
id
,
style
,
type
)
return
ptr
[
0
]
if
type
==
1
:
self
.
lib
.
lammps_extract_compute
.
restype
=
POINTER
(
c_double
)
ptr
=
self
.
lib
.
lammps_extract_compute
(
self
.
lmp
,
id
,
style
,
type
)
return
ptr
if
type
==
2
:
self
.
lib
.
lammps_extract_compute
.
restype
=
POINTER
(
POINTER
(
c_double
))
ptr
=
self
.
lib
.
lammps_extract_compute
(
self
.
lmp
,
id
,
style
,
type
)
return
ptr
return
None
# in case of global datum, free memory for 1 double via lammps_free()
# double was allocated by library interface function
def
extract_fix
(
self
,
id
,
style
,
type
,
i
=
0
,
j
=
0
):
id
=
id
.
encode
()
if
style
==
0
:
self
.
lib
.
lammps_extract_fix
.
restype
=
POINTER
(
c_double
)
ptr
=
self
.
lib
.
lammps_extract_fix
(
self
.
lmp
,
id
,
style
,
type
,
i
,
j
)
result
=
ptr
[
0
]
self
.
lib
.
lammps_free
(
ptr
)
return
result
elif
(
style
==
1
)
or
(
style
==
2
):
if
type
==
1
:
self
.
lib
.
lammps_extract_fix
.
restype
=
POINTER
(
c_double
)
elif
type
==
2
:
self
.
lib
.
lammps_extract_fix
.
restype
=
POINTER
(
POINTER
(
c_double
))
else
:
return
None
ptr
=
self
.
lib
.
lammps_extract_fix
(
self
.
lmp
,
id
,
style
,
type
,
i
,
j
)
return
ptr
else
:
return
None
# free memory for 1 double or 1 vector of doubles via lammps_free()
# for vector, must copy nlocal returned values to local c_double vector
# memory was allocated by library interface function
def
extract_variable
(
self
,
name
,
group
,
type
):
name
=
name
.
encode
()
group
=
group
.
encode
()
if
type
==
0
:
self
.
lib
.
lammps_extract_variable
.
restype
=
POINTER
(
c_double
)
ptr
=
self
.
lib
.
lammps_extract_variable
(
self
.
lmp
,
name
,
group
)
result
=
ptr
[
0
]
self
.
lib
.
lammps_free
(
ptr
)
return
result
if
type
==
1
:
self
.
lib
.
lammps_extract_global
.
restype
=
POINTER
(
c_int
)
nlocalptr
=
self
.
lib
.
lammps_extract_global
(
self
.
lmp
,
"nlocal"
)
nlocal
=
nlocalptr
[
0
]
result
=
(
c_double
*
nlocal
)()
self
.
lib
.
lammps_extract_variable
.
restype
=
POINTER
(
c_double
)
ptr
=
self
.
lib
.
lammps_extract_variable
(
self
.
lmp
,
name
,
group
)
for
i
in
range
(
nlocal
):
result
[
i
]
=
ptr
[
i
]
self
.
lib
.
lammps_free
(
ptr
)
return
result
return
None
# set variable value
# value is converted to string
# returns 0 for success, -1 if failed
def
set_variable
(
self
,
name
,
value
):
name
=
name
.
encode
()
value
=
str
(
value
)
.
encode
()
return
self
.
lib
.
lammps_set_variable
(
self
.
lmp
,
name
,
str
(
value
))
# return total number of atoms in system
def
get_natoms
(
self
):
return
self
.
lib
.
lammps_get_natoms
(
self
.
lmp
)
# return vector of atom properties gathered across procs, ordered by atom ID
def
gather_atoms
(
self
,
name
,
type
,
count
):
name
=
name
.
encode
()
natoms
=
self
.
lib
.
lammps_get_natoms
(
self
.
lmp
)
if
type
==
0
:
data
=
((
count
*
natoms
)
*
c_int
)()
self
.
lib
.
lammps_gather_atoms
(
self
.
lmp
,
name
,
type
,
count
,
data
)
elif
type
==
1
:
data
=
((
count
*
natoms
)
*
c_double
)()
self
.
lib
.
lammps_gather_atoms
(
self
.
lmp
,
name
,
type
,
count
,
data
)
else
:
return
None
return
data
# scatter vector of atom properties across procs, ordered by atom ID
# assume vector is of correct type and length, as created by gather_atoms()
def
scatter_atoms
(
self
,
name
,
type
,
count
,
data
):
name
=
name
.
encode
()
self
.
lib
.
lammps_scatter_atoms
(
self
.
lmp
,
name
,
type
,
count
,
data
)
class
OutputCapture
(
object
):
def
__init__
(
self
):
self
.
stdout_pipe_read
,
self
.
stdout_pipe_write
=
os
.
pipe
()
self
.
stdout_fd
=
1
def
__enter__
(
self
):
self
.
stdout
=
os
.
dup
(
self
.
stdout_fd
)
os
.
dup2
(
self
.
stdout_pipe_write
,
self
.
stdout_fd
)
return
self
def
__exit__
(
self
,
type
,
value
,
tracebac
):
os
.
dup2
(
self
.
stdout
,
self
.
stdout_fd
)
# check if we have more to read from the pipe
def
more_data
(
self
,
pipe
):
r
,
_
,
_
=
select
.
select
([
pipe
],
[],
[],
0
)
return
bool
(
r
)
# read the whole pipe
def
read_pipe
(
self
,
pipe
):
out
=
""
while
self
.
more_data
(
pipe
):
out
+=
str
(
os
.
read
(
pipe
,
1024
),
'utf-8'
)
return
out
@property
def
output
(
self
):
return
self
.
read_pipe
(
self
.
stdout_pipe_read
)
class
Variable
(
object
):
def
__init__
(
self
,
lammps_wrapper_instance
,
name
,
style
,
definition
):
self
.
lmp
=
lammps_wrapper_instance
self
.
name
=
name
self
.
style
=
style
self
.
definition
=
definition
.
split
()
@property
def
value
(
self
):
value
=
self
.
lmp
.
print
(
'"${
%s
}"'
%
self
.
name
)
.
strip
()
try
:
return
float
(
value
)
except
ValueError
:
return
value
class
AtomList
(
object
):
def
__init__
(
self
,
lammps_wrapper_instance
):
self
.
lmp
=
lammps_wrapper_instance
self
.
natoms
=
self
.
lmp
.
system
.
natoms
def
__getitem__
(
self
,
index
):
return
Atom
(
self
.
lmp
,
index
+
1
)
class
Atom
(
object
):
def
__init__
(
self
,
lammps_wrapper_instance
,
index
):
self
.
lmp
=
lammps_wrapper_instance
self
.
index
=
index
@property
def
id
(
self
):
return
int
(
self
.
lmp
.
eval
(
"id[
%d
]"
%
self
.
index
))
@property
def
type
(
self
):
return
int
(
self
.
lmp
.
eval
(
"type[
%d
]"
%
self
.
index
))
@property
def
mol
(
self
):
return
self
.
lmp
.
eval
(
"mol[
%d
]"
%
self
.
index
)
@property
def
mass
(
self
):
return
self
.
lmp
.
eval
(
"mass[
%d
]"
%
self
.
index
)
@property
def
position
(
self
):
return
(
self
.
lmp
.
eval
(
"x[
%d
]"
%
self
.
index
),
self
.
lmp
.
eval
(
"y[
%d
]"
%
self
.
index
),
self
.
lmp
.
eval
(
"z[
%d
]"
%
self
.
index
))
@property
def
velocity
(
self
):
return
(
self
.
lmp
.
eval
(
"vx[
%d
]"
%
self
.
index
),
self
.
lmp
.
eval
(
"vy[
%d
]"
%
self
.
index
),
self
.
lmp
.
eval
(
"vz[
%d
]"
%
self
.
index
))
@property
def
force
(
self
):
return
(
self
.
lmp
.
eval
(
"fx[
%d
]"
%
self
.
index
),
self
.
lmp
.
eval
(
"fy[
%d
]"
%
self
.
index
),
self
.
lmp
.
eval
(
"fz[
%d
]"
%
self
.
index
))
@property
def
charge
(
self
):
return
self
.
lmp
.
eval
(
"q[
%d
]"
%
self
.
index
)
class
LammpsWrapper
(
object
):
def
__init__
(
self
,
lmp
):
self
.
lmp
=
lmp
@property
def
atoms
(
self
):
return
AtomList
(
self
)
@property
def
system
(
self
):
output
=
self
.
info
(
"system"
)
d
=
self
.
_parse_info_system
(
output
)
return
namedtuple
(
'System'
,
d
.
keys
())(
*
d
.
values
())
@property
def
communication
(
self
):
output
=
self
.
info
(
"communication"
)
d
=
self
.
_parse_info_communication
(
output
)
return
namedtuple
(
'Communication'
,
d
.
keys
())(
*
d
.
values
())
@property
def
computes
(
self
):
output
=
self
.
info
(
"computes"
)
return
self
.
_parse_element_list
(
output
)
@property
def
dumps
(
self
):
output
=
self
.
info
(
"dumps"
)
return
self
.
_parse_element_list
(
output
)
@property
def
fixes
(
self
):
output
=
self
.
info
(
"fixes"
)
return
self
.
_parse_element_list
(
output
)
@property
def
groups
(
self
):
output
=
self
.
info
(
"groups"
)
return
self
.
_parse_groups
(
output
)
@property
def
variables
(
self
):
output
=
self
.
info
(
"variables"
)
vars
=
{}
for
v
in
self
.
_parse_element_list
(
output
):
vars
[
v
[
'name'
]]
=
Variable
(
self
,
v
[
'name'
],
v
[
'style'
],
v
[
'def'
])
return
vars
def
eval
(
self
,
expr
):
value
=
self
.
print
(
'"$(
%s
)"'
%
expr
)
.
strip
()
try
:
return
float
(
value
)
except
ValueError
:
return
value
def
_split_values
(
self
,
line
):
return
[
x
.
strip
()
for
x
in
line
.
split
(
','
)]
def
_get_pair
(
self
,
value
):
return
[
x
.
strip
()
for
x
in
value
.
split
(
'='
)]
def
_parse_info_system
(
self
,
output
):
lines
=
output
[
6
:
-
2
]
system
=
{}
for
line
in
lines
:
if
line
.
startswith
(
"Units"
):
system
[
'units'
]
=
self
.
_get_pair
(
line
)[
1
]
elif
line
.
startswith
(
"Atom style"
):
system
[
'atom_style'
]
=
self
.
_get_pair
(
line
)[
1
]
elif
line
.
startswith
(
"Atom map"
):
system
[
'atom_map'
]
=
self
.
_get_pair
(
line
)[
1
]
elif
line
.
startswith
(
"Atoms"
):
parts
=
self
.
_split_values
(
line
)
system
[
'natoms'
]
=
int
(
self
.
_get_pair
(
parts
[
0
])[
1
])
system
[
'ntypes'
]
=
int
(
self
.
_get_pair
(
parts
[
1
])[
1
])
system
[
'style'
]
=
self
.
_get_pair
(
parts
[
2
])[
1
]
elif
line
.
startswith
(
"Kspace style"
):
system
[
'kspace_style'
]
=
self
.
_get_pair
(
line
)[
1
]
elif
line
.
startswith
(
"Dimensions"
):
system
[
'dimensions'
]
=
self
.
_get_pair
(
line
)[
1
]
elif
line
.
startswith
(
"Orthogonal box"
):
system
[
'orthogonal_box'
]
=
[
float
(
x
)
for
x
in
self
.
_get_pair
(
line
)[
1
]
.
split
(
'x'
)]
elif
line
.
startswith
(
"Boundaries"
):
system
[
'boundaries'
]
=
self
.
_get_pair
(
line
)[
1
]
elif
line
.
startswith
(
"xlo"
):
keys
,
values
=
[
self
.
_split_values
(
x
)
for
x
in
self
.
_get_pair
(
line
)]
for
key
,
value
in
zip
(
keys
,
values
):
system
[
key
]
=
float
(
value
)
elif
line
.
startswith
(
"ylo"
):
keys
,
values
=
[
self
.
_split_values
(
x
)
for
x
in
self
.
_get_pair
(
line
)]
for
key
,
value
in
zip
(
keys
,
values
):
system
[
key
]
=
float
(
value
)
elif
line
.
startswith
(
"zlo"
):
keys
,
values
=
[
self
.
_split_values
(
x
)
for
x
in
self
.
_get_pair
(
line
)]
for
key
,
value
in
zip
(
keys
,
values
):
system
[
key
]
=
float
(
value
)
return
system
def
_parse_info_communication
(
self
,
output
):
lines
=
output
[
6
:
-
3
]
comm
=
{}
for
line
in
lines
:
if
line
.
startswith
(
"MPI library"
):
comm
[
'mpi_version'
]
=
line
.
split
(
':'
)[
1
]
.
strip
()
elif
line
.
startswith
(
"Comm style"
):
parts
=
self
.
_split_values
(
line
)
comm
[
'comm_style'
]
=
self
.
_get_pair
(
parts
[
0
])[
1
]
comm
[
'comm_layout'
]
=
self
.
_get_pair
(
parts
[
1
])[
1
]
elif
line
.
startswith
(
"Processor grid"
):
comm
[
'proc_grid'
]
=
[
int
(
x
)
for
x
in
self
.
_get_pair
(
line
)[
1
]
.
split
(
'x'
)]
elif
line
.
startswith
(
"Communicate velocities for ghost atoms"
):
comm
[
'ghost_velocity'
]
=
(
self
.
_get_pair
(
line
)[
1
]
==
"yes"
)
elif
line
.
startswith
(
"Nprocs"
):
parts
=
self
.
_split_values
(
line
)
comm
[
'nprocs'
]
=
int
(
self
.
_get_pair
(
parts
[
0
])[
1
])
comm
[
'nthreads'
]
=
int
(
self
.
_get_pair
(
parts
[
1
])[
1
])
return
comm
def
_parse_element_list
(
self
,
output
):
lines
=
output
[
6
:
-
3
]
elements
=
[]
for
line
in
lines
:
element_info
=
self
.
_split_values
(
line
.
split
(
':'
)[
1
]
.
strip
())
element
=
{
'name'
:
element_info
[
0
]}
for
key
,
value
in
[
self
.
_get_pair
(
x
)
for
x
in
element_info
[
1
:]]:
element
[
key
]
=
value
elements
.
append
(
element
)
return
elements
def
_parse_groups
(
self
,
output
):
lines
=
output
[
6
:
-
3
]
groups
=
[]
group_pattern
=
re
.
compile
(
r"(?P<name>.+) \((?P<type>.+)\)"
)
for
line
in
lines
:
m
=
group_pattern
.
match
(
line
.
split
(
':'
)[
1
]
.
strip
())
group
=
{
'name'
:
m
.
group
(
'name'
),
'type'
:
m
.
group
(
'type'
)}
groups
.
append
(
group
)
return
groups
def
__getattr__
(
self
,
name
):
def
handler
(
*
args
,
**
kwargs
):
cmd_args
=
[
name
]
+
[
str
(
x
)
for
x
in
args
]
with
OutputCapture
()
as
capture
:
self
.
lmp
.
command
(
' '
.
join
(
cmd_args
))
output
=
capture
.
output
lines
=
output
.
splitlines
()
if
len
(
lines
)
>
1
:
return
lines
elif
len
(
lines
)
==
1
:
return
lines
[
0
]
return
None
return
handler
class
LammpsIPythonWrapper
(
LammpsWrapper
):
def
__init__
(
self
,
lmp
):
super
(
LammpsIPythonWrapper
,
self
)
.
__init__
(
lmp
)
def
image
(
self
,
filename
=
"snapshot.png"
,
group
=
"all"
,
color
=
"type"
,
diameter
=
"type"
,
size
=
None
,
view
=
None
,
center
=
None
,
up
=
None
,
zoom
=
1.0
):
cmd_args
=
[
group
,
"image"
,
filename
,
color
,
diameter
]
if
size
:
width
=
size
[
0
]
height
=
size
[
1
]
cmd_args
+=
[
"size"
,
width
,
height
]
if
view
:
theta
=
view
[
0
]
phi
=
view
[
1
]
cmd_args
+=
[
"view"
,
theta
,
phi
]
if
center
:
flag
=
center
[
0
]
Cx
=
center
[
1
]
Cy
=
center
[
2
]
Cz
=
center
[
3
]
cmd_args
+=
[
"center"
,
flag
,
Cx
,
Cy
,
Cz
]
if
up
:
Ux
=
up
[
0
]
Uy
=
up
[
1
]
Uz
=
up
[
2
]
cmd_args
+=
[
"up"
,
Ux
,
Uy
,
Uz
]
if
zoom
:
cmd_args
+=
[
"zoom"
,
zoom
]
cmd_args
.
append
(
"modify backcolor white"
)
self
.
write_dump
(
*
cmd_args
)
from
IPython.core.display
import
Image
return
Image
(
'snapshot.png'
)
Event Timeline
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