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one2many.cpp
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Created
Thu, Oct 3, 22:38
Size
1 KB
Mime Type
text/x-c
Expires
Sat, Oct 5, 22:38 (1 d, 23 h)
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blob
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21329774
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rLAMMPS lammps
one2many.cpp
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#include "mpi.h"
#include "one2many.h"
#include "memory.h"
#include <map>
/* ---------------------------------------------------------------------- */
One2Many
::
One2Many
(
MPI_Comm
caller_comm
)
{
comm
=
caller_comm
;
MPI_Comm_rank
(
comm
,
&
me
);
MPI_Comm_size
(
comm
,
&
nprocs
);
memory
=
new
Memory
(
comm
);
hash
=
new
std
::
map
<
int
,
int
>
();
}
/* ---------------------------------------------------------------------- */
One2Many
::~
One2Many
()
{
delete
memory
;
delete
hash
;
}
/* ---------------------------------------------------------------------- */
void
One2Many
::
setup
(
int
nsrc_in
,
int
ndest
,
int
*
id
)
{
nsrc
=
nsrc_in
;
// store my local IDs in hash
hash
->
clear
();
for
(
int
i
=
0
;
i
<
ndest
;
i
++
)
hash
->
insert
(
std
::
pair
<
int
,
int
>
(
id
[
i
],
i
));
}
/* ---------------------------------------------------------------------- */
void
One2Many
::
scatter
(
double
*
src
,
int
n
,
double
*
dest
)
{
int
i
,
j
,
k
,
m
;
// allocate src on procs that don't have it
int
flag
=
0
;
if
(
src
==
NULL
)
{
src
=
(
double
*
)
memory
->
smalloc
(
n
*
nsrc
*
sizeof
(
double
),
"one2many:src"
);
flag
=
1
;
}
// broadcast src from 0 to other procs
MPI_Bcast
(
src
,
n
*
nsrc
,
MPI_DOUBLE
,
0
,
comm
);
// each proc loops over entire src
// if I own the global ID, copy src values into dest
std
::
map
<
int
,
int
>::
iterator
loc
;
for
(
m
=
1
;
m
<=
nsrc
;
m
++
)
{
loc
=
hash
->
find
(
m
);
if
(
loc
==
hash
->
end
())
continue
;
i
=
n
*
loc
->
second
;
j
=
3
*
(
m
-
1
);
if
(
n
==
1
)
dest
[
i
]
=
src
[
j
];
else
for
(
k
=
0
;
k
<
n
;
k
++
)
dest
[
i
++
]
=
src
[
j
++
];
}
// free locally allocated src
if
(
flag
)
memory
->
sfree
(
src
);
}
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