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Re: Pass data to a subprocess

From Roy Smith <roy@panix.com>
Newsgroups comp.lang.python
Subject Re: Pass data to a subprocess
Date 2012-08-01 06:59 -0400
Organization PANIX Public Access Internet and UNIX, NYC
Message-ID <roy-DBE17E.06593701082012@news.panix.com> (permalink)
References <CAF_E5JY5FgEJub7tNNzZEj0tri8Z7oPZUSLOLtD+5f0t7Yv+Yg@mail.gmail.com> <CAF_E5JY2sEsauXM-teW4hTHePqFCYK6z+9oLMZcjVWFyYs+gKg@mail.gmail.com> <5017EFB0.6080608@shopzeus.com> <CAF_E5JaEHxsjKoHRhZLzh+YdPU8UqKHae9efCsP7zEvm_37+2w@mail.gmail.com> <mailman.2809.1343809166.4697.python-list@python.org>

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In article <mailman.2809.1343809166.4697.python-list@python.org>,
 Laszlo Nagy <gandalf@shopzeus.com> wrote:

> Yes, I think that is correct. Instead of detaching a child process, you 
> can create independent processes and use other frameworks for IPC. For 
> example, Pyro.  It is not as effective as multiprocessing.Queue, but in 
> return, you will have the option to run your service across multiple 
> servers.

You might want to look at beanstalk (http://kr.github.com/beanstalkd/).  
We've been using it in production for the better part of two years.  At 
a 30,000 foot level, it's an implementation of queues over named pipes 
over TCP, but it takes care of a zillion little details for you.

Setup is trivial, and there's clients for all sorts of languages.  For a 
Python client, go with beanstalkc (pybeanstalk appears to be 
abandonware).
> 
> The most effective IPC is usually through shared memory. But there is no 
> OS independent standard Python module that can communicate over shared 
> memory.

It's true that shared memory is faster than serializing objects over a 
TCP connection.  On the other hand, it's hard to imagine anything 
written in Python where you would notice the difference.

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Thread

Re: Pass data to a subprocess Laszlo Nagy <gandalf@shopzeus.com> - 2012-08-01 10:19 +0200
  Re: Pass data to a subprocess Roy Smith <roy@panix.com> - 2012-08-01 06:59 -0400
    Re: Pass data to a subprocess Laszlo Nagy <gandalf@shopzeus.com> - 2012-08-01 13:07 +0200
    Re: Pass data to a subprocess Laszlo Nagy <gandalf@shopzeus.com> - 2012-08-01 13:26 +0200
    Re: Pass data to a subprocess andrea crotti <andrea.crotti.0@gmail.com> - 2012-08-01 14:25 +0100
    Re: Pass data to a subprocess Roy Smith <roy@panix.com> - 2012-08-01 15:07 -0400
  Re: Pass data to a subprocess Grant Edwards <invalid@invalid.invalid> - 2012-08-01 14:16 +0000
    Re: Pass data to a subprocess Laszlo Nagy <gandalf@shopzeus.com> - 2012-08-01 16:32 +0200
      Re: Pass data to a subprocess Grant Edwards <invalid@invalid.invalid> - 2012-08-01 19:48 +0000
        Re: Pass data to a subprocess Laszlo Nagy <gandalf@shopzeus.com> - 2012-08-02 08:10 +0200
          Re: Pass data to a subprocess Grant Edwards <invalid@invalid.invalid> - 2012-08-02 14:29 +0000
        Re: Pass data to a subprocess Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-02 13:21 -0400
    Re: Pass data to a subprocess Laszlo Nagy <gandalf@shopzeus.com> - 2012-08-01 16:42 +0200
    Re: Pass data to a subprocess andrea crotti <andrea.crotti.0@gmail.com> - 2012-08-01 16:24 +0100

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