Re: [Jython-users] multiprocessing support for jython

[Benjamin S. <sch...@pr...>]

Hey Jim,

    Thanx for the pointers. Yes I wasn't talking about porting the
implementation of the multiprocessing module as much as its interface so
that code written using it under python would just work under jython. The
fact that it's using processes in cpython vs. threads in jython isn't
terribly important I don't think. I'll definitely look into the tasks
concepts. Appreciate the response.

  -- Ben Scherrey

On Mon, Jul 26, 2010 at 8:31 PM, Jim Baker <jb...@zy...> wrote:

> Ben,
>
> You want to use Java's thread pool support through an executor service.
> This works very well with Jython, and is discussed in our Jython book,
> http://jythonpodcast.hostjava.net/jythonbook/en/1.0/Concurrency.html#working-with-tasks
>
> Working with tasks like this integrates well with regular Python code, if
> at the cost that it mixes in Java. I think that's a reasonable thing to do,
> the task model is generally a better abstraction than what we get with
> multiprocessing or threading.
>
> Lastly, porting multiprocessing really doesn't make a lot of sense
> (although it could certainly be done). Given the JVM footprint, coarse-grain
> parallelism at the level of processes would seem to be best done in the
> context of such tools as Hadoop.
>
> - Jim
>
> On Mon, Jul 26, 2010 at 5:12 AM, Benjamin Scherrey <
> sch...@pr...> wrote:
>
>> We've got a webservice that we'd like to deploy on jython that presently
>> uses multiprocessing. This doesn't seem to be available in jython yet. Since
>> jython doesn't have the GIL and apparently handles threading better than
>> CPython, is there a "best practice" method for jython to perform the same
>> functionality? I'd like to avoid reinventing the wheel. Is there a
>> plan/benefit to porting multiprocessing library to jython? It's nice to see
>> jython coming along well with the 2.5 release. Unfortunately the first code
>> I need to port uses libraries not available yet even though it's 100% pure
>> python. I'm willing to work around it but just need some advice as to the
>> best "jythonic" behaviour. :-)
>>
>>   thanx,
>>
>>   -- Ben
>>
>> PS: We also wish we could run tornado under jython. Could epoll be
>> replaced with some asyncore stuff and run?
>>
>>
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