假期在家撸了一个 python 爬虫

[hellorocky728]

周末没事儿在家学了学 python 的 gevent 库,感觉老牛逼了,顺便写了一个简单的爬虫,比较了 gevent 和 multithread 和 multiprocessing.欢迎拍砖.另外,请教一个问题,脚本在运行多进程的时候总是报错:

https://github.com/hellorocky/alexaTop500

Traceback (most recent call last):
  File "alexa.py", line 116, in <module>
    site.multiprocess()
  File "alexa.py", line 83, in multiprocess
    self.domain = multiprocessing.Manager().list()
  File "/home/rocky/python/lib/python2.7/multiprocessing/managers.py", line 667, in temp
    token, exp = self._create(typeid, *args, **kwds)
  File "/home/rocky/python/lib/python2.7/multiprocessing/managers.py", line 565, in _create
    conn = self._Client(self._address, authkey=self._authkey)
  File "/home/rocky/python/lib/python2.7/multiprocessing/connection.py", line 175, in Client
    answer_challenge(c, authkey)
  File "/home/rocky/python/lib/python2.7/multiprocessing/connection.py", line 432, in answer_challenge
    message = connection.recv_bytes(256)         # reject large message
IOError: [Errno 11] Resource temporarily unavailable

[zwpaper]

手机没细看，瞎猜一下，是不是 Socket 端口占用没处理好

[hellorocky728]

@zwpaper 应该不是吧,我都没有起服务,没有占用端口

[ericls]

试试 loop.run_in_executor 呢？ 用 future 的形式来看看

[firebroo]

resource xxx 报错应该是进程太多了

[stranbird]

可以先用 pep8 lint 一下。

[pright]

http://bugs.python.org/issue6056

multiprocessing 的坑感觉有点多

[prasanta]

为什么不用 aasync/await 呢

[panda0]

https://www.zhihu.com/question/29927678?sort=created

[hellorocky728]

@prasanta 这两天打算学学,然后用上,比较一下~

[rale]

这个 errno 11 来自于 c 语言， http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html ， 按这里的 define 你重试几次看看。

[hellorocky728]

@rale 虽然不知道怎么做,但还是感谢~

[hellorocky728]

@stranbird 谢谢

[ToughGuy]

ulimit -a 看看

[hellorocky728]

@ToughGuy

`
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 3862
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 10240
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 3862
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

`

[ToughGuy]

系统资源限制问题不大， 你代码里面多进程部分最好加上 queue, 限制同时 fork 的进程数量。