我最近张贴的问题Using multiprocessing for finding network paths,并高兴地已主动提出@unutbupython多处理挂起,潜在的队列内存错误?
很好地解决执行test_workers()
(利用多处理)功能时,我却已经陷入困境。该代码运行,但挂起了大量的节点N
在我的网络中G
运行使用Mac OS X Lion 10.7.5 - python 2.7时,它挂起时,N> 500。测井带来下述信息,之后将其挂起
[DEBUG/MainProcess] doing self._thread.start()
[DEBUG/MainProcess] starting thread to feed data to pipe
[DEBUG/MainProcess] ... done self._thread.start()
运行在通过VMware融合视窗7有利于较大的网络,但最终与围绕其中N> 20000个节点(I将理想地要使用此网络上向上图表挂起到N = 500,000)。来自窗边悬挂点的消息:
[DEBUG/MainProcess] starting thread to feed data to pipe
[DEBUG/MainProcess] ... done self._thread.start()[DEBUG/MainProcess] telling queue thread to quit
Traceback (most recent call last):
File "C:\Users\Scott\Desktop\fp_test.py", line 75, in <module>
Traceback (most recent call last):
File "C:\Python27\lib\multiprocessing\queues.py", line 264, in _feed
test_workers()
MemoryError
我想知道是否有人对此有何看法?并且如果有任何关于如何使这项工作适用于大型网络的建议?
非常感谢您的任何建议,您可能有。
@ unutbu代码:
import networkx as nx
import multiprocessing as mp
import random
import sys
import itertools as IT
import logging
logger = mp.log_to_stderr(logging.DEBUG)
def worker(inqueue, output):
result = []
count = 0
for pair in iter(inqueue.get, sentinel):
source, target = pair
for path in nx.all_simple_paths(G, source = source, target = target,
cutoff = None):
result.append(path)
count += 1
if count % 10 == 0:
logger.info('{c}'.format(c = count))
output.put(result)
def test_workers():
result = []
inqueue = mp.Queue()
for source, target in IT.product(sources, targets):
inqueue.put((source, target))
procs = [mp.Process(target = worker, args = (inqueue, output))
for i in range(mp.cpu_count())]
for proc in procs:
proc.daemon = True
proc.start()
for proc in procs:
inqueue.put(sentinel)
for proc in procs:
result.extend(output.get())
for proc in procs:
proc.join()
return result
def test_single_worker():
result = []
count = 0
for source, target in IT.product(sources, targets):
for path in nx.all_simple_paths(G, source = source, target = target,
cutoff = None):
result.append(path)
count += 1
if count % 10 == 0:
logger.info('{c}'.format(c = count))
return result
sentinel = None
seed = 1
m = 1
N = 1340//m
G = nx.gnm_random_graph(N, int(1.7*N), seed)
random.seed(seed)
sources = [random.randrange(N) for i in range(340//m)]
targets = [random.randrange(N) for i in range(1000//m)]
output = mp.Queue()
if __name__ == '__main__':
test_workers()
# test_single_worker()
# assert set(map(tuple, test_workers())) == set(map(tuple, test_single_worker()))
删除了日志记录调用后,我仍然发现代码挂在OSX上。你认为其他模块是否保持线程锁定? (以及我怎样才能找到答案?) - 另外;你知道我使用的队列大小是否有限制吗? –
@scott_ouce搜索一下我在跟踪'multiprocessing'的问题中发现了这个[issue](http://bugs.python.org/issue7200)。它可能与你的问题有关,因为它涉及到MacOSX和'mp.Queue'。 无论如何,它似乎真的很奇怪,因为我没有在代码中看到可能的weakref问题。 – Bakuriu