Created
April 24, 2015 04:33
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Test program for http://stackoverflow.com/questions/27809586/unexpected-memory-footprint-differences-when-spawning-python-multiprocessing-poo
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import multiprocessing as mp | |
import sys | |
import resource | |
def memory(): | |
self = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss | |
children = resource.getrusage(resource.RUSAGE_CHILDREN).ru_maxrss | |
return self + children | |
def debug(prefix): | |
msg = '{}: {}'.format(prefix, memory()) | |
sys.stderr.write(msg + '\n') | |
def process(data): | |
return data.upper() | |
if __name__ == '__main__': | |
import argparse | |
parser = argparse.ArgumentParser() | |
parser.add_argument('--pool_first', action='store_true') | |
parser.add_argument('--size', type=int, default=1) | |
args = parser.parse_args() | |
create_data = lambda size: '.' * args.size | |
# one worker process for faster and cleaner results | |
create_pool = lambda: mp.Pool(1) | |
if args.pool_first: | |
debug('start') | |
p = create_pool() | |
debug('pool created') | |
data = create_data() | |
debug('data created') | |
else: | |
debug('start') | |
data = create_data() | |
debug('data created') | |
p = create_pool() | |
debug('pool created') | |
p.map(process, data) | |
debug('processed') | |
# save references to avoid garbage collector affect results | |
_ = p | |
_ = data |
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