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cpython/Doc/includes/mp_pool.py at code-gen-add-parser · faster-cpython/cpython · GitHub
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mp_pool.py
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mp_pool.py
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import
multiprocessing
import
time
import
random
import
sys
#
# Functions used by test code
#
def
calculate
(
func
,
args
):
result
=
func
(
*
args
)
return
'%s says that %s%s = %s'
%
(
multiprocessing
.
current_process
().
name
,
func
.
__name__
,
args
,
result
)
def
calculatestar
(
args
):
return
calculate
(
*
args
)
def
mul
(
a
,
b
):
time
.
sleep
(
0.5
*
random
.
random
())
return
a
*
b
def
plus
(
a
,
b
):
time
.
sleep
(
0.5
*
random
.
random
())
return
a
+
b
def
f
(
x
):
return
1.0
/
(
x
-
5.0
)
def
pow3
(
x
):
return
x
**
3
def
noop
(
x
):
pass
#
# Test code
#
def
test
():
PROCESSES
=
4
print
(
'Creating pool with %d processes
\n
'
%
PROCESSES
)
with
multiprocessing
.
Pool
(
PROCESSES
)
as
pool
:
#
# Tests
#
TASKS
=
[(
mul
, (
i
,
7
))
for
i
in
range
(
10
)]
+
\
[(
plus
, (
i
,
8
))
for
i
in
range
(
10
)]
results
=
[
pool
.
apply_async
(
calculate
,
t
)
for
t
in
TASKS
]
imap_it
=
pool
.
imap
(
calculatestar
,
TASKS
)
imap_unordered_it
=
pool
.
imap_unordered
(
calculatestar
,
TASKS
)
print
(
'Ordered results using pool.apply_async():'
)
for
r
in
results
:
print
(
'
\t
'
,
r
.
get
())
print
()
print
(
'Ordered results using pool.imap():'
)
for
x
in
imap_it
:
print
(
'
\t
'
,
x
)
print
()
print
(
'Unordered results using pool.imap_unordered():'
)
for
x
in
imap_unordered_it
:
print
(
'
\t
'
,
x
)
print
()
print
(
'Ordered results using pool.map() --- will block till complete:'
)
for
x
in
pool
.
map
(
calculatestar
,
TASKS
):
print
(
'
\t
'
,
x
)
print
()
#
# Test error handling
#
print
(
'Testing error handling:'
)
try
:
print
(
pool
.
apply
(
f
, (
5
,)))
except
ZeroDivisionError
:
print
(
'
\t
Got ZeroDivisionError as expected from pool.apply()'
)
else
:
raise
AssertionError
(
'expected ZeroDivisionError'
)
try
:
print
(
pool
.
map
(
f
,
list
(
range
(
10
))))
except
ZeroDivisionError
:
print
(
'
\t
Got ZeroDivisionError as expected from pool.map()'
)
else
:
raise
AssertionError
(
'expected ZeroDivisionError'
)
try
:
print
(
list
(
pool
.
imap
(
f
,
list
(
range
(
10
)))))
except
ZeroDivisionError
:
print
(
'
\t
Got ZeroDivisionError as expected from list(pool.imap())'
)
else
:
raise
AssertionError
(
'expected ZeroDivisionError'
)
it
=
pool
.
imap
(
f
,
list
(
range
(
10
)))
for
i
in
range
(
10
):
try
:
x
=
next
(
it
)
except
ZeroDivisionError
:
if
i
==
5
:
pass
except
StopIteration
:
break
else
:
if
i
==
5
:
raise
AssertionError
(
'expected ZeroDivisionError'
)
assert
i
==
9
print
(
'
\t
Got ZeroDivisionError as expected from IMapIterator.next()'
)
print
()
#
# Testing timeouts
#
print
(
'Testing ApplyResult.get() with timeout:'
,
end
=
' '
)
res
=
pool
.
apply_async
(
calculate
,
TASKS
[
0
])
while
1
:
sys
.
stdout
.
flush
()
try
:
sys
.
stdout
.
write
(
'
\n
\t
%s'
%
res
.
get
(
0.02
))
break
except
multiprocessing
.
TimeoutError
:
sys
.
stdout
.
write
(
'.'
)
print
()
print
()
print
(
'Testing IMapIterator.next() with timeout:'
,
end
=
' '
)
it
=
pool
.
imap
(
calculatestar
,
TASKS
)
while
1
:
sys
.
stdout
.
flush
()
try
:
sys
.
stdout
.
write
(
'
\n
\t
%s'
%
it
.
next
(
0.02
))
except
StopIteration
:
break
except
multiprocessing
.
TimeoutError
:
sys
.
stdout
.
write
(
'.'
)
print
()
print
()
if
__name__
==
'__main__'
:
multiprocessing
.
freeze_support
()
test
()
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