IPython并行计算不工作
我试图让 ipython 并行编程在 Linux 机器上工作（Rocks/CentOS 5.4、Python 2.7.2、IPython 0.11）。安装没有问题，但是，我无法使用 ipcluster/ipython 执行任何命令。
也就是说，我尝试了以下命令。在 ipcluster 端：
/share/apps/Python-2.7/bin/ipcluster start --n=4
在 ipython 端：
[malkarouri@grid02 ~]$ /share/apps/Python-2.7/bin/ipython
Python 2.7.2 (default, Oct 18 2011, 15:35:37)
Type "copyright", "credits" or "license" for more information.
IPython 0.11 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]: from IPython.parallel import Client
In [2]: rc=Client()
In [3]: dview=rc[:]
In [4]: ar=dview.apply_async(lambda x: x + 3, 7)
In [5]: ar.get()
之后最后一个命令永远不会返回答案（实际上挂起）。
如何让 ipython 并行处理工作？
I am trying to get ipython parallel programming working on a Linux machine (Rocks/CentOS 5.4, Python 2.7.2, IPython 0.11). The installation had no problems, however, I am unable to execute any command using ipcluster/ipython.
Namely, I tried the following commands. On the ipcluster side:
/share/apps/Python-2.7/bin/ipcluster start --n=4
On the ipython side:
[malkarouri@grid02 ~]$ /share/apps/Python-2.7/bin/ipython
Python 2.7.2 (default, Oct 18 2011, 15:35:37)
Type "copyright", "credits" or "license" for more information.
IPython 0.11 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]: from IPython.parallel import Client
In [2]: rc=Client()
In [3]: dview=rc[:]
In [4]: ar=dview.apply_async(lambda x: x + 3, 7)
In [5]: ar.get()
after which the last command never comes back with an answer (effectively hangs).
How can I get ipython parallel processing to work?
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评论（3）
在 Ubuntu 11.10、python 2.7.2、ipython 0.11（与 pip 一起安装）上尝试了您的示例，它可以工作：
您可能想尝试为并行模块运行 ipython 测试套件，看看它在哪里失败：
在我的机器上，所有 97 个测试都通过。
tried your example on Ubuntu 11.10, python 2.7.2, ipython 0.11 (installed with pip) and it works:
you might want to try run the ipython test suite for the parallel module and see where it fails:
on my machine all 97 tests pass.
尝试定义一个函数，而不是 lambda 函数。
Try defining a function, not a lambda function.
ipcluster 关于它使用的配置文件（配置文件）说了些什么？
尝试在 Client() 创建中指定配置文件
或
What does ipcluster said about the config files (profile ) it used ?
Try specifying the profile in the Client() creation
or