Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #72530

Re: multiprocess (and paramiko)

Path csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!feeds.phibee-telecom.net!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 0.043
X-Spam-Evidence '*H*': 0.91; '*S*': 0.00; 'expected.': 0.09; 'cc:addr :python-list': 0.11; 'changes': 0.15; 'attributes.': 0.16; 'fork': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'missing?': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'appears': 0.22; 'cc:addr:python.org': 0.22; 'initial': 0.24; 'cc:2**0': 0.24; 'pass': 0.26; 'values': 0.27; 'gets': 0.27; 'header:In-Reply- To:1': 0.27; 'am,': 0.29; "doesn't": 0.30; 'message- id:@mail.gmail.com': 0.30; "i'm": 0.30; 'work.': 0.31; 'another.': 0.31; 'actual': 0.34; 'updated': 0.34; 'could': 0.34; 'subject: (': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'two': 0.37; 'that,': 0.38; 'explain': 0.39; 'itself': 0.39; 'information': 0.63; 'such': 0.63; 'happen': 0.63; 'different': 0.65; 'launches': 0.84; 'processes,': 0.91; 'to:none': 0.92
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:content-transfer-encoding; bh=NbtJ+jKOOOfPb9EeVK9lA4gC5GETScAKawIphxdHVF8=; b=RUJ70U84Ry/up1NaRxLgpUnSzatYjNsg+c2RYgaNO9RESWXseKP9qI3+pGwbmERoVE kW709+3Elpg0pwBHHOi2aHJbFYkDH2/AcAty1wn4ZjgdTGCtdlqpe1EWIp+S0QTrJRvf h+iJCagql/zl9xyldvYY9/XNQGvmAiQzqZ5f3c8d3UBQnFD5FxXsg0BSZ52ptY/0fn/V ZrW1Bzh2q20VS4yHItODWbN2nPeSLMwVsVMsc2wi0tMAx2Rmnm54W5f85lUXDeOu4KOK BKzfpiheF7KUPpPcjcsvCiZrLAq1TjrYbZML1LAJLCHWebZ2tCMV++9eymoelK4cy4vN wIhw==
MIME-Version 1.0
X-Received by 10.58.160.134 with SMTP id xk6mr2876683veb.64.1401811718998; Tue, 03 Jun 2014 09:08:38 -0700 (PDT)
In-Reply-To <3c0be3a7-9d2d-4530-958b-13be97db3765@googlegroups.com>
References <3c0be3a7-9d2d-4530-958b-13be97db3765@googlegroups.com>
Date Wed, 4 Jun 2014 02:08:38 +1000
Subject Re: multiprocess (and paramiko)
From Chris Angelico <rosuav@gmail.com>
Cc "python-list@python.org" <python-list@python.org>
Content-Type text/plain; charset=UTF-8
Content-Transfer-Encoding quoted-printable
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.10632.1401811721.18130.python-list@python.org> (permalink)
Lines 15
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1401811721 news.xs4all.nl 2940 [2001:888:2000:d::a6]:53088
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:72530

Show key headers only | View raw

On Wed, Jun 4, 2014 at 1:43 AM, mennis <michaelian.ennis@gmail.com> wrote:
> I was able to work around this by using a completely different design but I still don''t understand why this doesn't work.  It appears that the process that launches the process doesn't get access to updated object attributes.  When I set and check them in the object itself it behaves as expected.  When I check them from outside the object instance I get the initial values only.  Could someone explain what I'm missing?
>

When you fork into two processes, the child gets a copy of the
parent's state, but after that, changes happen completely
independently. You need to use actual multiprocessing features like
Queue and such to pass information from one process to another.

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

multiprocess (and paramiko) mennis <michaelian.ennis@gmail.com> - 2014-06-03 08:43 -0700
  Re: multiprocess (and paramiko) Chris Angelico <rosuav@gmail.com> - 2014-06-04 02:08 +1000
  Re: multiprocess (and paramiko) Roy Smith <roy@panix.com> - 2014-06-03 12:43 -0400
    Re: multiprocess (and paramiko) mennis <michaelian.ennis@gmail.com> - 2014-06-03 11:29 -0700

csiph-web