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Re: multiprocessing Pool.imap broken?

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  Re: multiprocessing Pool.imap broken? Yang Zhang <yanghatespam@gmail.com> - 2011-03-29 18:51 -0700

#2207 — Re: multiprocessing Pool.imap broken?

On Tue, Mar 29, 2011 at 6:44 PM, Yang Zhang <yanghatespam@gmail.com> wrote:
> I've tried both the multiprocessing included in the python2.6 Ubuntu
> package (__version__ says 0.70a1) and the latest from PyPI (2.6.2.1).
> In both cases I don't know how to use imap correctly - it causes the
> entire interpreter to stop responding to ctrl-C's.  Any hints?  Thanks
> in advance.
>
> $ python
> Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
> [GCC 4.4.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import multiprocessing as mp
>>>> mp.Pool(1).map(abs, range(3))
> [0, 1, 2]
>>>> list(mp.Pool(1).imap(abs, range(3)))
> ^C^C^C^C^\Quit
>

In case anyone jumps on this, this isn't an issue with running from the console:

$ cat /tmp/go3.py
import multiprocessing as mp
print mp.Pool(1).map(abs, range(3))
print list(mp.Pool(1).imap(abs, range(3)))

$ python /tmp/go3.py
[0, 1, 2]
^C^C^C^C^C^\Quit

(I've actually never seen the behavior described in the corresponding
Note at the top of the multiprocessing documentation.)

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