Perl Out Of Memory Error Windows
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Strawberry Perl Out Of Memory
favorite I'm attempting to build a n-gram language model based on the top 100K words found in the english language wikipedia dump. I've already extracted out the plain text with a modified XML parser written in Java, but need to convert it to a vocab file. In order to do this, I found a perl script that is said to do the job, but lacks instructions on how to execute. perl ulimit Needless to say, I'm a complete newbie to Perl and this is the first time I've encountered a need for its usage. When I run this script, I'm getting an Out of Memory Error when using this on a 7.2GB text file on two separate dual core machines with 4GB RAM and runnung Ubuntu 10.04 and 10.10. When I contacted the author, he said this script ran fine on a MacBook Pro with 4GB RAM, and the total in-memory usage was about 78 MB when executed on a 6.6GB text file with perl 5.12. The author also said that the script reads the input file line by line and creates a hashmap in memory. The script is: #! /usr/bin/perl use FindBin; use lib "$FindBin::Bin"; use strict; require 'english-utils.pl'; ## Create a list of words and their frequencies from an input corpus document ## (format: plain text, words separated by spaces, no sentence separators) ## TODO should words with hyphens be expanded? (e.g. three-dimensional) my %dict; my $min_len = 3; my $min_freq = 1; while (<>) { chomp($_); my @words = split(" ", $_); foreach my $word (@words) { # Check validity against regexp and acceptable use of apostrophe if ((length($word) >= $min_len) && ($word =~ /^[A-Z][A-Z\'-]+$/) && (index($w
Poetry RecentThreads NewestNodes Donate What'sNew on Feb 07, 2007 at 04:23UTC ( #598685=perlquestion: print w/replies, xml ) Need Help?? jesuashok has asked for the wisdom of the Perl Monks concerning the following question: Dear monks, I have a perl catch out of memory error perl script which is trying to read some files and storing those
Perl Memory Usage
lines into a hash. But each file size comes around 3MB or more. when I run the script I got the following error [belief] /apps/inst2/metrica/analysis_ericsson/schema_analysis> perl s +chema_analysis.pl -r rename_columns -u /apps/inst2/metrica/anthony/Er +icson_R10_Onsite/VFOZ_BACKUP/summaryspr/ -y /apps/inst2/metrica/anth +ony/Ericson_R10_Onsite/VFOZ_BACKUP/metalayer/ \ > -o only_in_old_schema -p /apps/inst2/metrica/anthony/Ericson_R10_Ons +ite/VFOZ_BACKUP/reportspr/ Out of memory! [download] Is there http://stackoverflow.com/questions/8128774/resolving-out-of-memory-error-when-executing-perl-script any way, can I resolve this Issue. Is it possible to control the memory usage. Comment on Out of memory!Download Code Replies are listed 'Best First'. Re: Out of memory! by GrandFather (Sage) on Feb 07, 2007 at 04:29UTC Is there any way you can post sample code that demonstrates the issue and indicate how many files are being manipulated? We http://www.perlmonks.org/?node_id=598685 need a little more information than "I have a problem with large hashes. How do I solve it?" if you want a better answer than "Use a tied hash" or "Install more memory". DWIM is Perl's answer to Gödel [reply] Re: Out of memory! by Tanktalus (Canon) on Feb 07, 2007 at 04:55UTC Generally speaking, when I've had that problem, it was that there was a memory limit via ulimit - removing that limit 'solved' the problem. At least, insofaras letting me use way more memory. Perhaps you have an underlying memory problem - wasting memory or leaking it, we can't be sure from your description. Assuming that not to be the case, though, it's probably a ulimit on memory.[reply] Re: Out of memory! by chargrill (Parson) on Feb 07, 2007 at 04:55UTC "Doctor, it hurts when I do this!" "Then don't do that." So the answer is simple - don't write perl programs that consume more memory than your system can allocate. --chargrill s**lil*; $*=join'',sort split q**; s;.*;grr; &&s+(.(.)).+$2$1+; $; = qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/) [download] [reply][d/l] Re: Out
Perl Lists Python Lists PHP Lists Ruby Lists Tcl Lists ActiveState Lists Lists » activeperl Perl "Out of Memory!" Issue From: Zarabozo, Francisco \(GE, http://code.activestate.com/lists/activeperl/20903/ Corporate\)
"I was told by a person who used Perl for computational genomics applications that it was running out of memory, so he switched to C++. What's your thoughts on running out of memory in Perl?" Just for posterity here is my reply (please note I'm no expert on this sort of thing and have never had the problem) was… Perl has a great garbage collector. But of course if you read in a 1 GB file into memory, then you are using 1 GB, whatever language you use. So the trick is to read in line by line and process the information that is required. This isn't always possible, but there could be a few other issues which your college didn't understand. For example you should not pass large data structures around, you should pass references to them, otherwise they get copied. my @a_big_list = qw(lots of stuff); bad(@a_big_list); good(\@a_big_list); sub bad { my @copy_of_list = @_; foreach my $thing (@copy_of_list) { ... } } sub good { my $list_reference = shift; foreach my $thing (@$list_reference) { ... } } The other one is if you use global variables all the time, instead of locally scoped variables (which are garbage collected when they go out of scope) you will have lots of extra memory used. Check out http://www.onyxneon.com/books/modern_perl/ (free) -- see "Array References" section for more info. Programs will run out of memory if the coder doesn't fully understand what they are doing, no matter what language. You may also be interested in checking out http://www.bioperl.org/ and asking questions on their IRC channel. Perl is used for mass data processing by these guys so they might have further insights. 14 comments Tagged as: perl memory 14 Comments Reini Urban | February 22, 2011 6:05 PM | Reply I also worked at a geometry problem, with a typical number of 800.000 points and doing some reasoning a