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Re: On-topic: alternate Python implementations

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.lang.python
Subject Re: On-topic: alternate Python implementations
References (1 earlier) <mailman.2924.1344062061.4697.python-list@python.org> <501cff63$0$29978$c3e8da3$5496439d@news.astraweb.com> <mailman.2930.1344079082.4697.python-list@python.org> <7x1ujmabs9.fsf@ruckus.brouhaha.com> <501dc461$0$29978$c3e8da3$5496439d@news.astraweb.com>
Date 2012-08-04 18:38 -0700
Message-ID <7x1ujm9kyu.fsf@ruckus.brouhaha.com> (permalink)
Organization Nightsong/Fort GNOX

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Steven D'Aprano <steve+comp.lang.python@pearwood.info> writes:
> Runtime optimizations that target the common case, but fall back to 
> unoptimized code in the rare cases that the optimization doesn't apply, 
> offer the opportunity of big speedups for most code at the cost of 
> trivial slowdowns when you do something unusual.

The problem is you can't always tell if the unusual case is being
exercised without an expensive dynamic check, which in some cases must
be repeated in every iteration of a critical inner loop, even though it
turns out that the program never actually uses the unusual case.

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Thread

On-topic: alternate Python implementations Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-04 06:15 +0000
  Re: On-topic: alternate Python implementations Chris Angelico <rosuav@gmail.com> - 2012-08-04 16:34 +1000
    Re: On-topic: alternate Python implementations Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-04 10:54 +0000
      Re: On-topic: alternate Python implementations Stefan Krah <stefan-usenet@bytereef.org> - 2012-08-04 13:18 +0200
        Re: On-topic: alternate Python implementations Paul Rubin <no.email@nospam.invalid> - 2012-08-04 08:59 -0700
          Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 18:55 +0200
            Re: On-topic: alternate Python implementations Paul Rubin <no.email@nospam.invalid> - 2012-08-04 11:18 -0700
              Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 21:06 +0200
                Re: On-topic: alternate Python implementations Paul Rubin <no.email@nospam.invalid> - 2012-08-04 13:43 -0700
                Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 23:24 +0200
              Re: On-topic: alternate Python implementations MRAB <python@mrabarnett.plus.com> - 2012-08-04 20:24 +0100
          Re: On-topic: alternate Python implementations Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-05 00:54 +0000
            Re: On-topic: alternate Python implementations Paul Rubin <no.email@nospam.invalid> - 2012-08-04 18:38 -0700
              Re: On-topic: alternate Python implementations Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-05 02:19 +0000
                Re: On-topic: alternate Python implementations John Nagle <nagle@animats.com> - 2012-08-06 22:57 -0700
              Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-05 07:37 +0200
            Re: On-topic: alternate Python implementations Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-04 23:09 -0400
      Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 13:32 +0200
  Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 08:40 +0200
    Re: On-topic: alternate Python implementations Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-04 07:49 +0000
      Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 11:10 +0200
        Re: On-topic: alternate Python implementations Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-08-04 14:51 +0200
          Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 15:53 +0200
            Re: On-topic: alternate Python implementations Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-08-08 10:29 +0200
          Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 16:03 +0200
      Re: On-topic: alternate Python implementations Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-04 11:05 +0100
      Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-04 12:59 +0200
      Re: On-topic: alternate Python implementations Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-04 19:24 +0100
        Re: On-topic: alternate Python implementations Temia Eszteri <lamialily@cleverpun.com> - 2012-08-04 11:34 -0700
        Re: On-topic: alternate Python implementations Ben Finney <ben+python@benfinney.id.au> - 2012-08-06 01:21 +1000
      Re: On-topic: alternate Python implementations Zero Piraeus <schesis@gmail.com> - 2012-08-04 14:42 -0400
      Re: On-topic: alternate Python implementations Zero Piraeus <schesis@gmail.com> - 2012-08-04 14:56 -0400
      Re: On-topic: alternate Python implementations Ethan Furman <ethan@stoneleaf.us> - 2012-08-05 07:27 -0700
  Re: On-topic: alternate Python implementations Tim Roberts <timr@probo.com> - 2012-08-04 13:07 -0700
  Re: On-topic: alternate Python implementations jwp <james.pye@gmail.com> - 2012-08-04 15:05 -0700
  Re: On-topic: alternate Python implementations Jürgen A. Erhard <jae+python@jaerhard.com> - 2012-08-05 01:25 +0200
  Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-05 07:46 +0200
  Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-05 09:51 +0200
  Re: On-topic: alternate Python implementations Jürgen A. Erhard <jae+python@jaerhard.com> - 2012-08-05 14:28 +0200
  Re: On-topic: alternate Python implementations alex23 <wuwei23@gmail.com> - 2012-08-05 20:40 -0700
    Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-06 08:21 +0200
  Re: On-topic: alternate Python implementations Stefan Behnel <stefan_ml@behnel.de> - 2012-08-06 08:46 +0200
  Alternate Python extensions (was alternate Python implementations) rusi <rustompmody@gmail.com> - 2012-08-06 21:23 -0700
    Re: Alternate Python extensions (was alternate Python implementations) Stefan Behnel <stefan_ml@behnel.de> - 2012-08-07 07:09 +0200

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