06-23-2011
You mean too much VM, or too much RAM? What is your symptom?
If a locally written program, mistakes like not free()ing dynamically allocated space before the pointer variable is lost or reloaded (memory leaks) are a common culprit. What flies in JAVA/C# is very bad in C/C++.
Mistakes in declarations can also hurt (arrays larger than needed), and bad tactics can require much memory (sorting big files in memory, for instance, or using DOM not SAX to parse XML.
Usng mmap() can use more RAM and less swap, which can be a problem or solution.
This User Gave Thanks to DGPickett For This Post:
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LEARN ABOUT SUSE
xml::dom::parser
XML::DOM::Parser(3) User Contributed Perl Documentation XML::DOM::Parser(3)
NAME
XML::DOM::Parser - An XML::Parser that builds XML::DOM document structures
SYNOPSIS
use XML::DOM;
my $parser = new XML::DOM::Parser;
my $doc = $parser->parsefile ("file.xml");
$doc->dispose; # Avoid memory leaks - cleanup circular references
DESCRIPTION
XML::DOM::Parser extends XML::Parser
The XML::Parser module was written by Clark Cooper and is built on top of XML::Parser::Expat, which is a lower level interface to James
Clark's expat library.
XML::DOM::Parser parses XML strings or files and builds a data structure that conforms to the API of the Document Object Model as described
at http://www.w3.org/TR/REC-DOM-Level-1 <http://www.w3.org/TR/REC-DOM-Level-1>. See the XML::Parser manpage for other additional
properties of the XML::DOM::Parser class. Note that the 'Style' property should not be used (it is set internally.)
The XML::Parser NoExpand option is more or less supported, in that it will generate EntityReference objects whenever an entity reference is
encountered in character data. I'm not sure how useful this is. Any comments are welcome.
As described in the synopsis, when you create an XML::DOM::Parser object, the parse and parsefile methods create an XML::DOM::Document
object from the specified input. This Document object can then be examined, modified and written back out to a file or converted to a
string.
When using XML::DOM with XML::Parser version 2.19 and up, setting the XML::DOM::Parser option KeepCDATA to 1 will store CDATASections in
CDATASection nodes, instead of converting them to Text nodes. Subsequent CDATASection nodes will be merged into one. Let me know if this
is a problem.
Using LWP to parse URLs
The parsefile() method now also supports URLs, e.g. http://www.erols.com/enno/xsa.xml. It uses LWP to download the file and then calls
parse() on the resulting string. By default it will use a LWP::UserAgent that is created as follows:
use LWP::UserAgent;
$LWP_USER_AGENT = LWP::UserAgent->new;
$LWP_USER_AGENT->env_proxy;
Note that env_proxy reads proxy settings from environment variables, which is what I need to do to get thru our firewall. If you want to
use a different LWP::UserAgent, you can either set it globally with:
XML::DOM::Parser::set_LWP_UserAgent ($my_agent);
or, you can specify it for a specific XML::DOM::Parser by passing it to the constructor:
my $parser = new XML::DOM::Parser (LWP_UserAgent => $my_agent);
Currently, LWP is used when the filename (passed to parsefile) starts with one of the following URL schemes: http, https, ftp, wais,
gopher, or file (followed by a colon.) If I missed one, please let me know.
The LWP modules are part of libwww-perl which is available at CPAN.
perl v5.12.1 2002-07-31 XML::DOM::Parser(3)