Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <rosuav@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.125
X-Spam-Level: *
X-Spam-Evidence: '*H*': 0.77; '*S*': 0.01; 'sure,': 0.09; 'cc:addr :python-list': 0.11; 'expecting': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'simpson': 0.16; 'slow,': 0.16; 'stdout': 0.16; 'wrote:': 0.18; 'aug': 0.22; 'cc:addr:python.org': 0.22; 'cc:2**0': 0.24; 'header:In-Reply-To:1': 0.27; 'nature': 0.30; 'message-id:@mail.gmail.com': 0.30; 'usually': 0.31; "user's": 0.31; 'becomes': 0.33; 'but': 0.35; 'received:google.com': 0.35; 'really': 0.36; 'subject:?': 0.36; 'pm,': 0.38; 'that,': 0.38; 'expect': 0.39; '12,': 0.39; 'enough': 0.39; 'how': 0.40; 'even': 0.60; 'free': 0.61; 'production': 0.68; 'apart': 0.72; 'day': 0.76; 'notable': 0.91; 'ratio': 0.91; 'to:none': 0.92; 'silent': 0.95
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=wZLXC6z528gbGm8tzZS5hrj8R/27NpTTbUopHmFsOwU=; b=TeiTVE0V0KO4heV3NRFJsPqX/+yXD3RQmQGTsEMxO+JrfkUvq9SL9gp0eP54+RGWnM hnlRpCAvmtV8jrwJ0WYhKgvjs0phewFNTvN0Gk/MPLjeLFxuK5hnzkYzeM1Z7Dw4anIj Mknd9B7x+gmjIfCbu9GUHrVBuE5CXxgjLET1Spzge3xo6wNl2JeGptbFyNb0K1AuJiBI PPzdRkhRgeOKnY3FQT0hFV/jtYPoc29bnZMJ3dBTUMVixtlRnPGZ0xCq/p8KeroCM1AQ 6Eq5Mw0VvC1HxR+jOHRr/+1G3YDvFKo1jfyCwb/xNX7xoCbZj7eaReeQJJjDW9tM1Itt 5UYw==
MIME-Version: 1.0
X-Received: by 10.50.88.37 with SMTP id bd5mr6153850igb.1.1407851583778; Tue, 12 Aug 2014 06:53:03 -0700 (PDT)
In-Reply-To: <20140812043104.GA21661@cskk.homeip.net>
References: <53e9583b$0$29973$c3e8da3$5496439d@news.astraweb.com> <20140812043104.GA21661@cskk.homeip.net>
Date: Tue, 12 Aug 2014 23:53:03 +1000
Subject: Re: Is print thread safe?
From: Chris Angelico <rosuav@gmail.com>
Cc: "python-list@python.org" <python-list@python.org>
Content-Type: text/plain; charset=UTF-8
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.12886.1407851593.18130.python-list@python.org>
Lines: 13
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1407851593 news.xs4all.nl 2902 [2001:888:2000:d::a6]:40344
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:76114

On Tue, Aug 12, 2014 at 2:31 PM, Cameron Simpson <cs@zip.com.au> wrote:
> I would expect file.write to be fast enough that the lock would usually be
> free.

Until the day when it becomes really REALLY slow, because your
program's piped into 'less' and the user's paging through it. But even
apart from that, writing to stdout can take a notable amount of time.
Expecting the lock to usually be free will depend on the nature of the
program - how much of it is spent in silent computation and how much
in production of output. If that ratio is sufficiently skewed, then
sure, the lock'll usually be free.

ChrisA