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pub
pi
Commits
7f63ccdf
Commit
7f63ccdf
authored
Feb 07, 2020
by
Neil Gershenfeld
Browse files
wip
parent
e9304940
Pipeline
#4927
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in 1 second
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Python/numbapip.py
0 → 100755
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7f63ccdf
#
# numbapip.py
# Neil Gershenfeld 2/6/20
# calculation of pi by a Numba parallel sum
# pi = 3.14159265358979323846
#
import
time
from
numba
import
njit
,
prange
NPTS
=
1000000000
@
njit
(
parallel
=
True
)
def
calc
():
a
=
0.5
b
=
0.75
c
=
0.25
pi
=
0
for
i
in
prange
(
1
,(
NPTS
+
1
)):
pi
+=
a
/
((
i

b
)
*
(
i

c
))
return
pi
pi
=
calc
()
# first call to compile the function
start_time
=
time
.
time
()
pi
=
calc
()
# second call uses the cached compilation
end_time
=
time
.
time
()
mflops
=
NPTS
*
5.0
/
(
1.0e6
*
(
end_time

start_time
))
print
(
"NPTS = %d, pi = %f"
%
(
NPTS
,
pi
))
print
(
"time = %f, estimated MFlops = %f"
%
(
end_time

start_time
,
mflops
))
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