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Re: Benefits of asyncio

References (2 earlier) <874n03t5t9.fsf@elektro.pacujo.net> <7x4n03dor0.fsf@ruckus.brouhaha.com> <878upe8poc.fsf@elektro.pacujo.net> <CAPTjJmqWkEStvrsrg30qjO+4TtLqfK9Q4GaByGovEw8NsdXzPg@mail.gmail.com> <lmkad5$hvh$1@ger.gmane.org>
Date 2014-06-03 22:01 +1000
Subject Re: Benefits of asyncio
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.10618.1401796902.18130.python-list@python.org> (permalink)

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On Tue, Jun 3, 2014 at 9:09 PM, Frank Millman <frank@chagford.com> wrote:
> So why not keep a 'connection pool', and for every potentially blocking
> request, grab a connection, set up a callback or a 'yield from' to wait for
> the response, and unblock.

Compare against a thread pool, where each thread simply does blocking
requests. With threads, you use blocking database, blocking logging,
blocking I/O, etc, and everything *just happens*; with a connection
pool, like this, you need to do every single one of them separately.
(How many of you have ever written non-blocking error logging? Or have
you written a non-blocking system with blocking calls to write to your
error log? The latter is far FAR more common, but all files, even
stdout/stderr, can block.) I don't see how Marko's assertion that
event-driven asynchronous programming is a breath of fresh air
compared with multithreading. The only way multithreading can possibly
be more complicated is that preemption can occur anywhere - and that's
exactly one of the big flaws in async work, if you don't do your job
properly.

ChrisA

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Benefits of asyncio Aseem Bansal <asmbansal2@gmail.com> - 2014-06-02 10:40 -0700
  Re: Benefits of asyncio Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-02 12:37 -0600
  Re: Benefits of asyncio Terry Reedy <tjreedy@udel.edu> - 2014-06-02 16:07 -0400
    Re: Benefits of asyncio Roy Smith <roy@panix.com> - 2014-06-02 16:19 -0400
    Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-02 23:28 +0300
      Re: Benefits of asyncio Paul Rubin <no.email@nospam.invalid> - 2014-06-02 13:45 -0700
        Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 07:49 +1000
        Re: Benefits of asyncio Terry Reedy <tjreedy@udel.edu> - 2014-06-02 21:51 -0400
        Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-03 09:36 +0300
          Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 18:47 +1000
            Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-03 12:10 +0300
              Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 19:30 +1000
                Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-03 13:08 +0300
                Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 20:23 +1000
                Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-03 14:12 +0300
                Re: Benefits of asyncio Paul Rubin <no.email@nospam.invalid> - 2014-06-04 00:52 -0700
              Re: Benefits of asyncio Burak Arslan <burak.arslan@arskom.com.tr> - 2014-06-03 14:05 +0300
              Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 21:57 +1000
              Re: Benefits of asyncio Burak Arslan <burak.arslan@arskom.com.tr> - 2014-06-04 08:10 +0300
              Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-04 17:30 +1000
              Re: Benefits of asyncio Paul Rubin <no.email@nospam.invalid> - 2014-06-04 00:48 -0700
          Re: Benefits of asyncio "Frank Millman" <frank@chagford.com> - 2014-06-03 13:09 +0200
          Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 22:01 +1000
            Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-03 16:05 +0300
              Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 23:31 +1000
                Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-03 16:42 +0300
                Re: Benefits of asyncio Chris Angelico <rosuav@gmail.com> - 2014-06-03 23:49 +1000
                Re: Benefits of asyncio Marko Rauhamaa <marko@pacujo.net> - 2014-06-03 19:18 +0300
              Re: Benefits of asyncio Roy Smith <roy@panix.com> - 2014-06-03 11:40 -0400
        Re: Benefits of asyncio Paul Sokolovsky <pmiscml@gmail.com> - 2014-06-03 11:31 +0300
  Re: Benefits of asyncio Burak Arslan <burak.arslan@arskom.com.tr> - 2014-06-03 00:07 +0300
  Re: Benefits of asyncio Aseem Bansal <asmbansal2@gmail.com> - 2014-06-02 21:54 -0700

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