[26607] in Perl-Users-Digest
Perl-Users Digest, Issue: 8719 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Thu Dec 1 21:16:21 2005
Date: Thu, 1 Dec 2005 18:16:14 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Thu, 1 Dec 2005 Volume: 10 Number: 8719
Today's topics:
My experience with XML::DOM VS XML::LibXML <jvs@india.ti.com>
Re: My experience with XML::DOM VS XML::LibXML robic0
Re: My experience with XML::DOM VS XML::LibXML robic0
Re: My experience with XML::DOM VS XML::LibXML <jvs@india.ti.com>
Re: My experience with XML::DOM VS XML::LibXML <notvalid@email.com>
Not able to write using Open2 <Ashwin@DoNot@Email.com>
placing results from google in an array <nospam@home.com>
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@augustmail.com
string and hash [quite long] <h2so4@biggest-pc.reg>
Re: string and hash [quite long] <h2so4@biggest-pc.reg>
Re: Understanding 'scope' robic0
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Thu, 1 Dec 2005 10:49:38 +0530
From: Jahagirdar Vijayvithal S <jvs@india.ti.com>
Subject: My experience with XML::DOM VS XML::LibXML
Message-Id: <slrndot1va.q1s.jvs@bstclindt008.india.ti.com>
I have a script where I am
1> Opening a pipe to a program which reads in a binary file(400MB) and dumps out XML data(XXX GB's) (tethereal)
2> Grabing chunk's of data within tags <packet>.....</packet> (approx 4
to 20 K)
3> parsing the XML
4> post processing based on fields and attributes in the XML document.
Initially I used XML::DOM and found that my memory consumption
constantly increased filling up the entire RAM and SWAP space before
crashing(approx 32GB RAM and 160+ GB Swap consumed).
Switching to XML:LibXML and replacing the XML::DOM constructs with their
equivalent I find that my worst case Memory consumption remains below
2GB each (RAM and swap) and average is around 50 MB each.
While my problem is solved I am curious to know wether there is any
known Issues which caused the above problems?
code fragment used by me is as below
-----------------------------Code-----------------
use XML::DOM;
my $parser = XML::DOM::Parser->new();
open XML ,"$tethereal -r $pcapfile -T pdml|" or die "Cant open a simple pipe? go smoke one!";
while(<XML>){
#print;
if(my $range=/<packet>/.../<\/packet>/){
if($range==1){
$data="<JVS_PARSER>";
}
$data="$data $_";
if ($range=~/E0/){
$data="$data</JVS_PARSER>";
........ various calls to function getval and Other processingstuff
}
}
}
sub getval(){
my ($data,$name,$attribute)=@_;
return unless defined($data);
my $doc = $parser->parse($data);#Should be parsing this just once outside the function call
foreach my $element ($doc->getElementsByTagName('field')){
if ($element->getAttribute('name') eq $name){
return $element->getAttribute($attribute);
}
}
return -1; #Error
}
--------------------------End Code-------------------------
Regards
Jahagirdar Vijayvithal S
--
------------------------------
Date: Wed, 30 Nov 2005 22:08:17 -0800
From: robic0
Subject: Re: My experience with XML::DOM VS XML::LibXML
Message-Id: <0k3to1dsca7avfqvpo7hjh0ddas4n83acm@4ax.com>
On Thu, 1 Dec 2005 10:49:38 +0530, Jahagirdar Vijayvithal S
<jvs@india.ti.com> wrote:
>I have a script where I am
>1> Opening a pipe to a program which reads in a binary file(400MB) and dumps out XML data(XXX GB's) (tethereal)
>2> Grabing chunk's of data within tags <packet>.....</packet> (approx 4
>to 20 K)
So the data within tags contains the xml you want to parse?
>3> parsing the XML
within the packet tags
>4> post processing based on fields and attributes in the XML document.
which document?
>
>Initially I used XML::DOM and found that my memory consumption
>constantly increased filling up the entire RAM and SWAP space before
>crashing(approx 32GB RAM and 160+ GB Swap consumed).
>Switching to XML:LibXML and replacing the XML::DOM constructs with their
>equivalent I find that my worst case Memory consumption remains below
>2GB each (RAM and swap) and average is around 50 MB each.
>
use SAX, nodes will fall off the ends of the earth
>While my problem is solved I am curious to know wether there is any
>known Issues which caused the above problems?
>
>code fragment used by me is as below
>-----------------------------Code-----------------
>use XML::DOM;
>my $parser = XML::DOM::Parser->new();
>open XML ,"$tethereal -r $pcapfile -T pdml|" or die "Cant open a simple pipe? go smoke one!";
> while(<XML>){
> #print;
> if(my $range=/<packet>/.../<\/packet>/){
^ ^^^
bad Perl? (...) capture?
what would happen if:
<packet>adsfbasdfbabf</packet><packet>adsfbasdfbabf
</packet><packet>adsfbasdfbabf</packet>
<packet>adsfbasdfbabf
</packet>
Thats the funny thing about xml, you can edit it in notepad.
> if($range==1){
will it even get here if $range == 0?
> $data="<JVS_PARSER>";
> }
> $data="$data $_";
what are you grabbing here? i thought you just needed packet data?
> if ($range=~/E0/){
> $data="$data</JVS_PARSER>";
>........ various calls to function getval and Other processingstuff
> }
> }
>}
>
>sub getval(){
sub getval(???){ ## ?
> my ($data,$name,$attribute)=@_;
> return unless defined($data);
> my $doc = $parser->parse($data);#Should be parsing this just once outside the function call
> foreach my $element ($doc->getElementsByTagName('field')){
> if ($element->getAttribute('name') eq $name){
> return $element->getAttribute($attribute);
> }
> }
> return -1; #Error
>}
>
>--------------------------End Code-------------------------
>
>Regards
>Jahagirdar Vijayvithal S
Don't know how you got anything to work on this.
You would be better off if you use SAX to start with.
I know the whole XXX gigabyte attracts attention to you
question but you should give more details.
------------------------------
Date: Wed, 30 Nov 2005 22:23:00 -0800
From: robic0
Subject: Re: My experience with XML::DOM VS XML::LibXML
Message-Id: <2d5to1tcetck00q2mb9u02qljpdgvn93d9@4ax.com>
On Wed, 30 Nov 2005 22:08:17 -0800, robic0 wrote:
>>Initially I used XML::DOM and found that my memory consumption
>>constantly increased filling up the entire RAM and SWAP space before
>>crashing(approx 32GB RAM and 160+ GB Swap consumed).
>>Switching to XML:LibXML and replacing the XML::DOM constructs with their
>>equivalent I find that my worst case Memory consumption remains below
>>2GB each (RAM and swap) and average is around 50 MB each.
>>
>use SAX, nodes will fall off the ends of the earth
>>While my problem is solved I am curious to know wether there is any
>>known Issues which caused the above problems?
>>
These are a good general use, high performance strategy, node
alternative for xml:
use XML::Xerces;
use XML::Parser::Expat;
use XML::Simple;
$XML::Simple::PREFERRED_PARSER = 'XML::Parser';
Once you setup a template for SAX parsing processing,
you can use it on any xml no matter what the structure.
And I'm talking about quad-terrabyte xml file that
you can process with 512 megs of ram.
------------------------------
Date: Thu, 1 Dec 2005 15:58:17 +0530
From: Jahagirdar Vijayvithal S <jvs@india.ti.com>
Subject: Re: My experience with XML::DOM VS XML::LibXML
Message-Id: <slrndotk21.q1s.jvs@bstclindt008.india.ti.com>
* robic0 <robic0> wrote:
> On Thu, 1 Dec 2005 10:49:38 +0530, Jahagirdar Vijayvithal S
> <jvs@india.ti.com> wrote:
>
>>I have a script where I am
>>1> Opening a pipe to a program which reads in a binary file(400MB) and dumps out XML data(XXX GB's) (tethereal)
>>2> Grabing chunk's of data within tags <packet>.....</packet> (approx 4
>>to 20 K)
> So the data within tags contains the xml you want to parse?
Right.
>>3> parsing the XML
> within the packet tags
right again
>>4> post processing based on fields and attributes in the XML document.
> which document?
Oops sorry for the confusion I meant based on elements and attributes
within the <packet> </packet> tags.
>>
>>Initially I used XML::DOM and found that my memory consumption
>>constantly increased filling up the entire RAM and SWAP space before
>>crashing(approx 32GB RAM and 160+ GB Swap consumed).
>>Switching to XML:LibXML and replacing the XML::DOM constructs with their
>>equivalent I find that my worst case Memory consumption remains below
>>2GB each (RAM and swap) and average is around 50 MB each.
one additional observation is that the XML::DOM would crash after
processing around 6K such packets where as XML::LibXML was able to
handle more than .6G packets
since the only thing that changed was the line
use XML::DOM;
my $parser = XML::DOM::Parser->new();
and the function getval();
and the changes were that of replacing these lines by their equivalent
in XML::LibXML I was wondering what could be the problem. while my
initial guess is that of some sort of memory leak......
>>
> use SAX, nodes will fall off the ends of the earth
>>While my problem is solved I am curious to know wether there is any
>>known Issues which caused the above problems?
>>
>>code fragment used by me is as below
>>-----------------------------Code-----------------
>>use XML::DOM;
>>my $parser = XML::DOM::Parser->new();
>>open XML ,"$tethereal -r $pcapfile -T pdml|" or die "Cant open a simple pipe? go smoke one!";
>> while(<XML>){
>> #print;
>> if(my $range=/<packet>/.../<\/packet>/){
> ^ ^^^
> bad Perl? (...) capture?
bad perl: why?
... => range operator with evaluation of RHS pattern in the next cycle.
and $range capturing the sequence number.
> what would happen if:
> <packet>adsfbasdfbabf</packet><packet>adsfbasdfbabf
> </packet><packet>adsfbasdfbabf</packet>
> <packet>adsfbasdfbabf
> </packet>
While theoritically possible the tool converting the binary data to XML
always dumps out one element per line e.g.
<packet>
<proto name="geninfo" pos="0" showname="General information" size="114">
<field name="num" pos="0" show="1" showname="Number" value="1" size="114"/>
<field name="len" pos="0" show="114" showname="Packet Length" value="72" size="114"/>
<field name="caplen" pos="0" show="114" showname="Captured Length" value="72" size="114"/>
<field name="timestamp" pos="0" show="Sep 30, 2005 11:34:22.158787000" showname="Captured Time" value="1128060262.158787000" size="114"/>
</proto>
....
</packet>
> Thats the funny thing about xml, you can edit it in notepad.
>> if($range==1){
> will it even get here if $range == 0?
no, refer perldoc perlop for range operator.
>> $data="<JVS_PARSER>";
>> }
>> $data="$data $_";
> what are you grabbing here? i thought you just needed packet data?
Thats right. I am reading each line from XML, as long as it falls
between the <packet></packet> tags appending it to $data to form one
single scalar with the required data.
>> if ($range=~/E0/){
>> $data="$data</JVS_PARSER>";
>>........ various calls to function getval and Other processingstuff
>> }
>> }
>>}
>>
>>sub getval(){
> sub getval(???){ ## ?
prototype declared at top of file (not included in code snippet)
>> my ($data,$name,$attribute)=@_;
>> return unless defined($data);
>> my $doc = $parser->parse($data);#Should be parsing this just once outside the function call
>> foreach my $element ($doc->getElementsByTagName('field')){
>> if ($element->getAttribute('name') eq $name){
>> return $element->getAttribute($attribute);
>> }
>> }
>> return -1; #Error
>>}
>>
>>--------------------------End Code-------------------------
>>
>>Regards
>>Jahagirdar Vijayvithal S
>
> Don't know how you got anything to work on this.
I hope the comments above would clarify some of your doubts.
> You would be better off if you use SAX to start with.
while I have been following the SAX vs ... debate in other thread. I was
already familiar with XML::DOM and had a code base using DOM to build
on. which facilitated a quick workable code which could be used to
perform the actual processing I am interested in.
> I know the whole XXX gigabyte attracts attention to you
> question but you should give more details.
Regards
Jahagirdar Vijayvithal S
--
------------------------------
Date: Thu, 01 Dec 2005 17:59:29 GMT
From: Ala Qumsieh <notvalid@email.com>
Subject: Re: My experience with XML::DOM VS XML::LibXML
Message-Id: <5SGjf.22761$D13.21826@newssvr11.news.prodigy.com>
robic0 wrote:
> On Thu, 1 Dec 2005 10:49:38 +0530, Jahagirdar Vijayvithal S
> <jvs@india.ti.com> wrote:
[snip]
>> while(<XML>){
>> #print;
>> if(my $range=/<packet>/.../<\/packet>/){
>
> ^ ^^^
> bad Perl? (...) capture?
No, this is good Perl. This is not a regexp, but a range operator.
--Ala
------------------------------
Date: Tue, 29 Nov 2005 14:36:13 GMT
From: "Ashwin" <Ashwin@DoNot@Email.com>
Subject: Not able to write using Open2
Message-Id: <xn0eablkbk03sc5000@news.europe.nokia.com>
Here is my complete code , I am trying to call a file, and then I need
to pass cirtain inputes which script asks,
I am opening with open2 and then trying to write with WRITE, I am able
to read but cannot write I mean I cannot send the input to WRITE handle
what could be wrong
TIA
use warnings;
use strict;
use IPC::Open2;
use Cwd;
my $currentdir=cwd();
my $pid;
chdir ("/source/internal/") or die "Cannot Change Directory";
$pid = open2 (\*READ,\*MY_WRITE,"BuildInternal.pl") or die;
while (<READ>)
{
print $_;
}
print MY_WRITE\n";
while (<READ>)
{
print $_;
}
close MY_WRITE;
close READ;
--
------------------------------
Date: Mon, 28 Nov 2005 20:57:57 GMT
From: "Nospam" <nospam@home.com>
Subject: placing results from google in an array
Message-Id: <pbKif.5906$uR.40@newsfe7-gui.ntli.net>
Bear with me I am a perl beginner, I am trying to place the results of
google into an array so far the relevant code is:
$agent->get(my $url =
'http://www.google.co.uk/search?hl=en&safe=off&q=inurl%3Afootball++%22fixtur
es%22&meta=');
my @urls = $agent->find_all_links( url_regex=> qr/viewtopic/);
@urls = map { $_->[0]}@urls;
foreach my $url (@urls)
however on printing out this array, all it prints out is the the $url
repeatedly, it seems that $url is the only url that is placed in the array,
what functions would I need to move the results into the array, an example
would be greatly appreciated.
------------------------------
Date: 29 Nov 2005 08:22:14 GMT
From: tadmc@augustmail.com
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.5 $)
Message-Id: <438c0fb5$0$1764$8b463f8a@news.nationwide.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.5 $)
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These features are a really big bonus toward your question winning
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It happens so often that folks will assume that it is happening yet
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Asked Question is worded similar to your question, folks will assume
that you did not look at all. Don't become indignant at pointers to
the FAQ, particularly if it solves your problem.
Asking a question easily answered by a cursory doc search
If folks think you have not even tried the obvious step of reading
the docs applicable to your problem, they are likely to become
annoyed.
If you are flamed for not checking when you *did* check, then just
shrug it off (and take the answer that you got).
Asking for emailed answers
Emailed answers benefit one person. Posted answers benefit the
entire community. If folks can take the time to answer your
question, then you can take the time to go get the answer in the
same place where you asked the question.
It is OK to ask for a *copy* of the answer to be emailed, but many
will ignore such requests anyway. If you munge your address, you
should never expect (or ask) to get email in response to a Usenet
post.
Ask the question here, get the answer here (maybe).
Beware of saying "doesn't work"
This is a "red flag" phrase. If you find yourself writing that,
pause and see if you can't describe what is not working without
saying "doesn't work". That is, describe how it is not what you
want.
Sending a "stealth" Cc copy
A "stealth Cc" is when you both email and post a reply without
indicating *in the body* that you are doing so.
Be extra cautious when you get upset
Count to ten before composing a followup when you are upset
This is recommended in all Usenet newsgroups. Here in clpmisc, most
flaming sub-threads are not about any feature of Perl at all! They
are most often for what was seen as a breach of netiquette. If you
have lurked for a bit, then you will know what is expected and won't
make such posts in the first place.
But if you get upset, wait a while before writing your followup. I
recommend waiting at least 30 minutes.
Count to ten after composing and before posting when you are upset
After you have written your followup, wait *another* 30 minutes
before committing yourself by posting it. You cannot take it back
once it has been said.
AUTHOR
Tad McClellan <tadmc@augustmail.com> and many others on the
comp.lang.perl.misc newsgroup.
------------------------------
Date: Mon, 28 Nov 2005 21:22:08 GMT
From: No_name <h2so4@biggest-pc.reg>
Subject: string and hash [quite long]
Message-Id: <4yKif.11287$S6.190070@twister2.libero.it>
Hi at hall, I am a beginner and I've got this problem: translate a string,
runtime generated by lsdvd program, into an hash. The string is similar at
this:
our %lsdvd = (
device => '/dev/dvd',
title => 'DVDVOLUME',
vmg_id => 'DVDVIDEO-VMG',
provider_id => '',
track => [
{
ix => 1,
length => 5309.090,
vts_id => 'DVDVIDEO-VTS',
},
{
ix => 2,
length => 22.050,
vts_id => 'DVDVIDEO-VTS',
},
{
ix => 3,
length => 63.060,
vts_id => 'DVDVIDEO-VTS',
},
{
ix => 4,
length => 181.280,
vts_id => 'DVDVIDEO-VTS',
},
{
ix => 5,
length => 181.280,
vts_id => 'DVDVIDEO-VTS',
},
],
longest_track => 1,
);
There is a way?
P.S. sorry for my poor English
------------------------------
Date: Wed, 30 Nov 2005 17:47:39 GMT
From: No_name <h2so4@biggest-pc.reg>
Subject: Re: string and hash [quite long]
Message-Id: <%Aljf.62550$65.1781112@twister1.libero.it>
Thanks at all, eval() is perfect, I've tested it today.
Enri'S
------------------------------
Date: Tue, 29 Nov 2005 01:05:29 -0800
From: robic0
Subject: Re: Understanding 'scope'
Message-Id: <u96oo1945hc9hq6v8rke16u1dkie006js0@4ax.com>
On 14 Feb 2004 17:53:37 -0800, Prab_kar@hotmail.com (Prabh) wrote:
>Hello all,
>Is it possible to access a variable with local scope in a subroutine
>from outside of the subroutine?
>
Why yes, yes it is. As long as that subroutine accesses the globally
named variable and was called withing the scope of the local variable
declaration, and it was a global.
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
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------------------------------
End of Perl-Users Digest V10 Issue 8719
***************************************
