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Full Discussion: sort takes a long time
Top Forums Shell Programming and Scripting sort takes a long time Post 302494729 by methyl on Tuesday 8th of February 2011 07:54:12 AM
Old 02-08-2011
"Linux" is a bit vague.

Here are my timings for sorting a 600 Mb file after giving "sort" one Gigabyte of memory and a very large workspace. It used about 800 Mb of disc workspace and didn't make a dent in the memory. The unsorted file is random order but I also reverse sorted it to be sure that the test is representative.
This test server is nothing special - a 10 year old HP 9000 with HP-UX 11i and slowish 36Gb 10k rpm discs.

Code:
Ordinary sort:
date;sort -o bigfile.sor -T /workspace -y 1048576 bigfile;date
Tue Feb  8 12:25:47 GMT 2011
Tue Feb  8 12:28:10 GMT 2011

Dictionary sort:
date;sort -fd -o bigfile.sor -T /workspace -y 1048576 bigfile;date
Tue Feb  8 12:31:17 GMT 2011
Tue Feb  8 12:36:19 GMT 2011

Reverse sorting the output from the previous sort:
date;sort -r -fd -o bigfile.rev -T /workspace -y 1048576 bigfile.sor;date
Tue Feb  8 12:44:26 GMT 2011
Tue Feb  8 12:49:07 GMT 2011


Are you sure that you file is only 200 Mb ?
Last edited by methyl; 02-08-2011 at 08:56 AM.. Reason: paste errors
 

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LEARN ABOUT DEBIAN

mojo::date

Mojo::Date(3pm) 					User Contributed Perl Documentation					   Mojo::Date(3pm)

NAME

       Mojo::Date - HTTP 1.1 date container

SYNOPSIS

	 use Mojo::Date;

	 my $date = Mojo::Date->new(784111777);
	 my $http_date = $date->to_string;
	 $date->parse('Sun, 06 Nov 1994 08:49:37 GMT');
	 my $epoch = $date->epoch;

DESCRIPTION

       Mojo::Date implements HTTP 1.1 date and time functions according to RFC 2616.

	 Sun, 06 Nov 1994 08:49:37 GMT	; RFC 822, updated by RFC 1123
	 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
	 Sun Nov  6 08:49:37 1994	; ANSI C's asctime() format

ATTRIBUTES

       Mojo::Date implements the following attributes.

   "epoch"
	 my $epoch = $date->epoch;
	 $date	   = $date->epoch(784111777);

       Epoch seconds.

METHODS

       Mojo::Date inherits all methods from Mojo::Base and implements the following new ones.

   "new"
	 my $date = Mojo::Date->new;
	 my $date = Mojo::Date->new($string);

       Construct a new Mojo::Date object.

   "parse"
	 $date = $date->parse('Sun Nov	6 08:49:37 1994');

       Parse date in one of the following formats.

	 - Epoch format(784111777)
	 - RFC 822/1123 (Sun, 06 Nov 1994 08:49:37 GMT)
	 - RFC 850/1036 (Sunday, 06-Nov-94 08:49:37 GMT)
	 - ANSI C asctime() (Sun Nov  6 08:49:37 1994)

   "to_string"
	 my $string = $date->to_string;

       Render date suitable for HTTP 1.1 messages.

SEE ALSO

       Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.

perl v5.14.2							    2012-09-05							   Mojo::Date(3pm)
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