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simple_memoryspaces.cpp
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Tue, Aug 27, 05:00
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rLAMMPS lammps
simple_memoryspaces.cpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// 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. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "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 SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#include <Kokkos_Core.hpp>
#include <cstdio>
// The type of a two-dimensional N x 3 array of double.
// It lives in Kokkos' default memory space.
typedef
Kokkos
::
View
<
double
*
[
3
]
>
view_type
;
// The "HostMirror" type corresponding to view_type above is also a
// two-dimensional N x 3 array of double. However, it lives in the
// host memory space corresponding to view_type's memory space. For
// example, if view_type lives in CUDA device memory, host_view_type
// lives in host (CPU) memory. Furthermore, declaring host_view_type
// as the host mirror of view_type means that host_view_type has the
// same layout as view_type. This makes it easier to copy between the
// two Views.
// Advanced issues: If a memory space is accessible from the host without
// performance penalties then it is its own host_mirror_space. This is
// the case for HostSpace, CudaUVMSpace and CudaHostPinnedSpace.
typedef
view_type
::
HostMirror
host_view_type
;
struct
ReduceFunctor
{
view_type
a
;
ReduceFunctor
(
view_type
a_
)
:
a
(
a_
)
{}
typedef
int
value_type
;
//Specify type for reduction value, lsum
KOKKOS_INLINE_FUNCTION
void
operator
()
(
int
i
,
int
&
lsum
)
const
{
lsum
+=
a
(
i
,
0
)
-
a
(
i
,
1
)
+
a
(
i
,
2
);
}
};
int
main
()
{
Kokkos
::
initialize
();
view_type
a
(
"A"
,
10
);
// If view_type and host_mirror_type live in the same memory space,
// a "mirror view" is just an alias, and deep_copy does nothing.
// Otherwise, a mirror view of a device View lives in host memory,
// and deep_copy does a deep copy.
host_view_type
h_a
=
Kokkos
::
create_mirror_view
(
a
);
// The View h_a lives in host (CPU) memory, so it's legal to fill
// the view sequentially using ordinary code, like this.
for
(
int
i
=
0
;
i
<
10
;
i
++
)
{
for
(
int
j
=
0
;
j
<
3
;
j
++
)
{
h_a
(
i
,
j
)
=
i
*
10
+
j
;
}
}
Kokkos
::
deep_copy
(
a
,
h_a
);
// Copy from host to device.
int
sum
=
0
;
Kokkos
::
parallel_reduce
(
10
,
ReduceFunctor
(
a
),
sum
);
printf
(
"Result is %i
\n
"
,
sum
);
Kokkos
::
finalize
();
}
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