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Re: Reducing cache/buffer for faster display

References <cmuej9-0ml.ln1@murmur.very.softly> <mailman.1522.1348783807.27098.python-list@python.org> <k42jp3$1nc$1@reader1.panix.com>
Date 2012-09-28 08:38 +1000
Subject Re: Reducing cache/buffer for faster display
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.1523.1348785513.27098.python-list@python.org> (permalink)

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On Fri, Sep 28, 2012 at 8:25 AM, John Gordon <gordon@panix.com> wrote:
> Isn't terminal output line-buffered?  I don't understand why there would
> be an output delay.  (Unless the "\r" is messing things up...)

This is a classic progress-indication case, which does indeed mess up
line-buffering. The carriage return (and no line feed, done in the
Python 2 style of a trailing comma) puts the cursor back to the
beginning of the line, ready to overwrite, and ripe for one of those
old favorite incomplete overwrite errors - if nFiles monotonically
increases, it's fine, but if it decreases, the display can get ugly.

ChrisA

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Thread

Reducing cache/buffer for faster display Rikishi42 <skunkworks@rikishi42.net> - 2012-09-27 23:57 +0200
  Re: Reducing cache/buffer for faster display Chris Angelico <rosuav@gmail.com> - 2012-09-28 08:09 +1000
    Re: Reducing cache/buffer for faster display John Gordon <gordon@panix.com> - 2012-09-27 22:25 +0000
      Re: Reducing cache/buffer for faster display Chris Angelico <rosuav@gmail.com> - 2012-09-28 08:38 +1000
        Re: Reducing cache/buffer for faster display Rikishi42 <skunkworks@rikishi42.net> - 2012-09-28 02:05 +0200
          Re: Reducing cache/buffer for faster display Chris Angelico <rosuav@gmail.com> - 2012-09-28 18:08 +1000
            Re: Reducing cache/buffer for faster display Rikishi42 <skunkworks@rikishi42.net> - 2012-09-29 02:31 +0200
      Re: Reducing cache/buffer for faster display Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-09-27 21:46 -0400
        Re: Reducing cache/buffer for faster display Rikishi42 <skunkworks@rikishi42.net> - 2012-09-29 02:20 +0200
          Re: Reducing cache/buffer for faster display Hans Mulder <hansmu@xs4all.nl> - 2012-09-29 14:32 +0200
          Re: Reducing cache/buffer for faster display Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-09-29 14:12 -0400
    Re: Reducing cache/buffer for faster display Rikishi42 <skunkworks@rikishi42.net> - 2012-09-28 02:15 +0200

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