Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed3a.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 0.081
X-Spam-Evidence: '*H*': 0.85; '*S*': 0.01; 'restarted': 0.09; 'subject:skip:f 10': 0.09; 'subject:still': 0.09; 'runs': 0.10; 'cc:addr:python-list': 0.11; 'python': 0.11; 'code),': 0.16; 'consequence,': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'heap': 0.16; 'wrote:': 0.18; 'work,': 0.20; 'memory': 0.22; 'cc:addr:python.org': 0.22; 'cc:2**0': 0.24; "i've": 0.25; 'header:In-Reply-To:1': 0.27; "doesn't": 0.30; 'said,': 0.30; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'usually': 0.31; 'stuff': 0.32; 'running': 0.33; 'fri,': 0.33; "can't": 0.35; 'objects': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'subject:?': 0.36; 'pm,': 0.38; 'does': 0.39; 'subject:" ': 0.39; 'sure': 0.39; 'entire': 0.61; 'places': 0.64; 'therefore,': 0.64; 'subject': 0.69; 'fact,': 0.69; "everything's": 0.84; 'permanently.': 0.84; 'pike': 0.84; 'subject:High': 0.84; 'technique.': 0.84; 'to:none': 0.92; 'suffering': 0.93; 'serious': 0.97
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=6VnGv8QR7MFM4aB+LVyebYO5OcjtnrM1UrdhzY/qwiU=; b=RrC0VGHtYaWCc0y06Yd8hoLG5hoNhbeE8AKSZHWYwfYWUjpFcQ1txnct0C+rUe0QdQ AvSTKh/OcRLxZkBSg+sjEYn7bU+BtNEIGKXcyVuRcs2vC9+dxMvQXmGT9YJDk8XmjhJz HIJ6zLE1xbQq90wvxtn9MWrnbQdw27AKylXVzdgHIvVeFkUn4tp8sv3QLCzH92cS8d+g Gjeo7/aFu9Mv5ez2RTN9LnqJfQG5v7Qp0rMjYq8yWzyemkXTMdYvIQWRoABWUDI2kISd Nf6di+fzDAFncPL5tSId+y3pyX4vZdzepQN55p71OPuARklbztFteNiU2lnWpWu2CwRf l+Pg==
MIME-Version: 1.0
X-Received: by 10.43.94.7 with SMTP id bw7mr13719825icc.26.1412923969210; Thu, 09 Oct 2014 23:52:49 -0700 (PDT)
In-Reply-To: <87d2a0piaq.fsf@handshake.de>
References: <CANm61jc=pB7n+5kuea6bmYXTbo3hXLT8d4JZx3Yq-TBtgGrFOQ@mail.gmail.com> <mailman.14590.1412378803.18130.python-list@python.org> <7ac186c3-2dbc-4cfa-ab58-37854aeb59d1@googlegroups.com> <mailman.14647.1412613796.18130.python-list@python.org> <b5ce5cc2-3a37-49e4-aa2a-d29dd3dda972@googlegroups.com> <m16vb8$psb$1@ger.gmane.org> <87d2a0piaq.fsf@handshake.de>
Date: Fri, 10 Oct 2014 17:52:49 +1100
Subject: Re: "High water" Memory fragmentation still a thing?
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.14740.1412923972.18130.python-list@python.org>
Lines: 17
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1412923972 news.xs4all.nl 2894 [2001:888:2000:d::a6]:41895
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:78927

On Fri, Oct 10, 2014 at 5:09 PM, dieter <dieter@handshake.de> wrote:
> Python does not use memory compaction but places many objects on the
> heap and therefore, long running processes
> usually are subject to memory fragmentation. As a consequence, those
> processes need to be restarted from time to time.

Pike doesn't use memory compaction either, and also places pretty much
everything on the heap. Yet its processes don't need to be restarted;
in fact, everything's designed around keeping stuff running
permanently. As Emile said, it's not a requirement, it's a
compensation technique. I've yet to build a Python process that runs
for an entire year (as I'm not confident that I can get it so right
that I don't need to update any code), so I can't say for sure that it
would work, but I do have Python processes running for multiple months
without suffering serious fragmentation.

ChrisA