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Re: Speeding up Python's exit

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Date Fri, 1 Mar 2013 04:06:39 +1100
Subject Re: Speeding up Python's exit
From Chris Angelico <rosuav@gmail.com>
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On Fri, Mar 1, 2013 at 3:49 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> I think the reason it took so long was that Python was garbage-collecting
> a giant dict with 10 million entries, each one containing a list of the
> form [1, [2, 3], 4]. But still, that's terribly slow -- ironically, it
> took longer to dispose of the dict (12+ minutes) than it took to create
> it in the first place (approx 3 minutes, with a maximum load of 4).

Leaving the question of just *why* you have so much in your dict.....
but anyway.

Is it any different if you create a deliberate reference loop and then
stuff it into some module somewhere? That would force it to be kept
until interpreter shutdown, and then a cyclic garbage collection after
that, which quite probably would be never run. A stupid trick,
perhaps, but it might work; I tested it with a dummy class with a
__del__ method and it wasn't called. Putting it into some other module
may not be necessary, but I don't know what happens with the
interactive interpreter and what gets freed up when.

ChrisA

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Thread

Speeding up Python's exit Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-28 16:49 +0000
  Re: Speeding up Python's exit Neil Cerutti <neilc@norwich.edu> - 2013-02-28 17:02 +0000
  Re: Speeding up Python's exit Chris Angelico <rosuav@gmail.com> - 2013-03-01 04:06 +1100
  Re: Speeding up Python's exit Chris Angelico <rosuav@gmail.com> - 2013-03-01 04:33 +1100
  Re: Speeding up Python's exit Devin Jeanpierre <jeanpierreda@gmail.com> - 2013-02-28 12:33 -0500
  Re: Speeding up Python's exit Devin Jeanpierre <jeanpierreda@gmail.com> - 2013-02-28 12:31 -0500
  Re: Speeding up Python's exit Grant Edwards <invalid@invalid.invalid> - 2013-03-01 01:17 +0000
    Re: Speeding up Python's exit Antoine Pitrou <solipsis@pitrou.net> - 2013-03-01 19:10 +0000
    Re: Speeding up Python's exit Dave Angel <davea@davea.name> - 2013-03-01 14:17 -0500
    Re: Speeding up Python's exit Antoine Pitrou <solipsis@pitrou.net> - 2013-03-01 22:51 +0000
      Re: Speeding up Python's exit Ross Ridge <rridge@csclub.uwaterloo.ca> - 2013-03-03 18:27 -0500
    Re: Speeding up Python's exit Jason Swails <jason.swails@gmail.com> - 2013-03-01 21:51 -0500
  Re: Speeding up Python's exit Antoine Pitrou <solipsis@pitrou.net> - 2013-03-01 14:59 +0000

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