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Groups > comp.lang.python > #55429

Re: feature requests

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On 10/03/2013 09:12 AM, macker wrote:
> Hi, hope this is the right group for this:
>
> I miss two basic (IMO) features in parallel processing:
>
> 1. make `threading.Thread.start()` return `self`
>
> I'd like to be able to `workers = [Thread(params).start() for params in whatever]`. Right now, it's 5 ugly, menial lines:
>
>          workers = []
>          for params in whatever:
>              thread = threading.Thread(params)
>              thread.start()
>              workers.append(thread)

Ugly, menial lines are a clue that a function to hide it could be useful.


> 2. make multiprocessing pools (incl. ThreadPool) limit the size of their internal queues
>
> As it is now, the queue will greedily consume its entire input, and if the input is large and the pool workers are slow in consuming it, this blows up RAM. I'd like to be able to `pool = Pool(4, max_qsize=1000)`. Same with the output queue (finished tasks).

Have you verified that this is a problem in Python?


> Or does anyone know of a way to achieve this?

You could try subclassing.

--
~Ethan~

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feature requests macker <tester.testerus@gmail.com> - 2013-10-03 09:12 -0700
  Re: feature requests Chris Angelico <rosuav@gmail.com> - 2013-10-04 02:21 +1000
  Re: feature requests Tim Chase <python.list@tim.thechases.com> - 2013-10-03 11:42 -0500
  Re: feature requests Chris Angelico <rosuav@gmail.com> - 2013-10-04 02:42 +1000
  Re: feature requests Ethan Furman <ethan@stoneleaf.us> - 2013-10-03 10:01 -0700
    Re: feature requests macker <tester.testerus@gmail.com> - 2013-10-05 05:49 -0700
      Re: feature requests Ethan Furman <ethan@stoneleaf.us> - 2013-10-05 08:58 -0700
      Re: feature requests Terry Reedy <tjreedy@udel.edu> - 2013-10-05 17:56 -0400

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