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钟尚武
dlib
Commits
7d8d7fe4
Commit
7d8d7fe4
authored
Apr 04, 2017
by
Davis King
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Added cuda_data, a templated container for GPU memory.
parent
c1bc27c5
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cuda_utils.h
dlib/dnn/cuda_utils.h
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dlib/dnn/cuda_utils.h
View file @
7d8d7fe4
...
...
@@ -11,6 +11,10 @@
#include <cuda_runtime.h>
#include <sstream>
#include <iostream>
#include <memory>
#include <vector>
#include <type_traits>
// Check the return value of a call to the CUDA runtime for an error condition.
...
...
@@ -26,6 +30,91 @@ do{
} \
}while(false)
// ----------------------------------------------------------------------------------------
namespace
dlib
{
namespace
cuda
{
template
<
typename
T
>
class
cuda_data
{
/*!
WHAT THIS OBJECT REPRESENTS
This is a block of memory on a CUDA device.
!*/
public
:
static_assert
(
std
::
is_standard_layout
<
T
>::
value
,
"You can only create basic standard layout types on the GPU"
);
cuda_data
()
=
default
;
cuda_data
(
size_t
n
)
:
num
(
n
)
/*!
ensures
- This object will allocate a device memory buffer of n T objects.
- #size() == n
!*/
{
if
(
n
==
0
)
return
;
T
*
data
=
nullptr
;
CHECK_CUDA
(
cudaMalloc
(
&
data
,
n
*
sizeof
(
T
)));
pdata
.
reset
((
T
*
)
data
,
[](
T
*
ptr
){
auto
err
=
cudaFree
(
ptr
);
if
(
err
!=
cudaSuccess
)
std
::
cerr
<<
"cudaFree() failed. Reason: "
<<
cudaGetErrorString
(
err
)
<<
std
::
endl
;
});
}
T
*
data
()
{
return
pdata
.
get
();
}
const
T
*
data
()
const
{
return
pdata
.
get
();
}
operator
T
*
()
{
return
pdata
.
get
();
}
operator
const
T
*
()
const
{
return
pdata
.
get
();
}
void
reset
()
{
pdata
.
reset
();
}
size_t
size
()
const
{
return
num
;
}
private
:
size_t
num
=
0
;
std
::
shared_ptr
<
T
>
pdata
;
};
template
<
typename
T
>
void
memcpy
(
std
::
vector
<
T
>&
dest
,
const
cuda_data
<
T
>&
src
)
{
dest
.
resize
(
src
.
size
());
if
(
src
.
size
()
!=
0
)
{
CHECK_CUDA
(
cudaMemcpy
(
dest
.
data
(),
src
.
data
(),
src
.
size
()
*
sizeof
(
T
),
cudaMemcpyDefault
));
}
}
template
<
typename
T
>
void
memcpy
(
cuda_data
<
T
>&
dest
,
const
std
::
vector
<
T
>&
src
)
{
if
(
dest
.
size
()
!=
src
.
size
())
dest
=
cuda_data
<
T
>
(
src
.
size
());
if
(
src
.
size
()
!=
0
)
{
CHECK_CUDA
(
cudaMemcpy
(
dest
.
data
(),
src
.
data
(),
src
.
size
()
*
sizeof
(
T
),
cudaMemcpyDefault
));
}
}
}
}
// ----------------------------------------------------------------------------------------
#ifdef __CUDACC__
...
...
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