mirror of https://github.com/python/cpython.git
154 lines
3.8 KiB
Python
154 lines
3.8 KiB
Python
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('\tGot ZeroDivisionError as expected from pool.apply()')
|
|
else:
|
|
raise AssertionError('expected ZeroDivisionError')
|
|
|
|
try:
|
|
print(pool.map(f, list(range(10))))
|
|
except ZeroDivisionError:
|
|
print('\tGot ZeroDivisionError as expected from pool.map()')
|
|
else:
|
|
raise AssertionError('expected ZeroDivisionError')
|
|
|
|
try:
|
|
print(list(pool.imap(f, list(range(10)))))
|
|
except ZeroDivisionError:
|
|
print('\tGot 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('\tGot 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()
|