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daxpy.cpp
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Created
Mon, Mar 3, 05:19
Size
649 B
Mime Type
text/x-c
Expires
Wed, Mar 5, 05:19 (1 d, 13 h)
Engine
blob
Format
Raw Data
Handle
24620323
Attached To
R11821 phys-743-lecture
daxpy.cpp
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#include <chrono>
#include <iostream>
#include <vector>
int
main
()
{
unsigned
int
N
=
1e8
;
std
::
vector
<
double
>
a
(
N
);
std
::
vector
<
double
>
b
(
N
);
std
::
vector
<
double
>
c
(
N
);
for
(
unsigned
int
i
=
0
;
i
<
N
;
++
i
)
{
a
[
i
]
=
1.0
*
i
;
b
[
i
]
=
10.0
*
i
;
}
double
alpha
=
rand
()
%
1000
/
1000.0
;
auto
t1
=
std
::
chrono
::
high_resolution_clock
::
now
();
for
(
unsigned
int
i
=
0
;
i
<
N
;
++
i
)
{
c
[
i
]
=
a
[
i
]
+
alpha
*
b
[
i
];
}
auto
t2
=
std
::
chrono
::
high_resolution_clock
::
now
();
std
::
chrono
::
duration
<
double
,
std
::
milli
>
ms_double
=
t2
-
t1
;
std
::
cout
<<
"For loop ran in "
<<
ms_double
.
count
()
<<
"ms"
<<
std
::
endl
;
return
0
;
}
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