Path: csiph.com!news.mixmin.net!news.unit0.net!fu-berlin.de!uni-berlin.de!not-for-mail
From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Almost crashing computer, was Re: how to solve memory
Date: Fri, 10 Jun 2016 16:41:43 +0200
Organization: None
Lines: 25
Message-ID: <mailman.140.1465569713.2306.python-list@python.org>
References: <4f853aa2-cc00-480b-9fd7-79b05cbd4889@googlegroups.com> <575ac991$0$1583$c3e8da3$5496439d@news.astraweb.com> <njejj9$k4o$1@ger.gmane.org>
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7Bit
X-Trace: news.uni-berlin.de k3ftvyA/dxGou03hwa/GfQaq8ZrjEzK0c6Np2kPqyqtw==
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.001
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'python3': 0.05; '/dev/null': 0.09; 'path)': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'consume': 0.16; 'crashed': 0.16; 'dfs': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'received:t-ipconnect.de': 0.16; 'wrote:': 0.16; 'memory': 0.17; 'prevent': 0.20; 'machine': 0.21; '(the': 0.22; 'code,': 0.23; '(most': 0.24; 'script': 0.25; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'linux': 0.26; 'becomes': 0.30; 'computer.': 0.32; "d'aprano": 0.33; 'steven': 0.33; 'traceback': 0.33; 'file': 0.34; 'path': 0.35; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'received:org': 0.37; 'to:addr:python.org': 0.40; 'received:de': 0.40; 'your': 0.60; 'skip:u 10': 0.61; 'subject': 0.70
X-Injected-Via-Gmane: http://gmane.org/
X-Gmane-NNTP-Posting-Host: p57bd9d73.dip0.t-ipconnect.de
User-Agent: KNode/4.13.3
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.22
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>
X-Mailman-Original-Message-ID: <njejj9$k4o$1@ger.gmane.org>
X-Mailman-Original-References: <4f853aa2-cc00-480b-9fd7-79b05cbd4889@googlegroups.com> <575ac991$0$1583$c3e8da3$5496439d@news.astraweb.com>
Xref: csiph.com comp.lang.python:109790

Steven D'Aprano wrote:

> I just ran your code, and it almost crashed my computer. 

When you suspect that a script may consume a lot of memory (the subject 
might have been a hint)

ulimit (bash internal) 

helps you prevent that your linux machine becomes unresponsive.

$ ulimit -v 200000
$ python3 tmp2.py > /dev/null
Traceback (most recent call last):
  File "tmp2.py", line 134, in <module>
    mresult = DFS(b, 2, 2, mylist, path)
  File "tmp2.py", line 125, in DFS
    path = DFS(b, deep-1, maxx, sourceoperators, path)
  File "tmp2.py", line 129, in DFS
    b.append([str(i)+str(j) for i,j in zip(aaa, bbb)])
  File "tmp2.py", line 129, in <listcomp>
    b.append([str(i)+str(j) for i,j in zip(aaa, bbb)])
MemoryError