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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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GMDATE(3)								 1								 GMDATE(3)

gmdate - Format a GMT/UTC date/time

SYNOPSIS
string gmdate (string $format, [int $timestamp = time()]) DESCRIPTION
Identical to the date(3) function except that the time returned is Greenwich Mean Time (GMT). PARAMETERS
o $format - The format of the outputted date string. See the formatting options for the date(3) function. o $timestamp - The optional $timestamp parameter is an integer Unix timestamp that defaults to the current local time if a $timestamp is not given. In other words, it defaults to the value of time(3). RETURN VALUES
Returns a formatted date string. If a non-numeric value is used for $timestamp, FALSE is returned and an E_WARNING level error is emitted. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | The valid range of a timestamp is typically from | | | Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 | | | 03:14:07 GMT. (These are the dates that corre- | | | spond to the minimum and maximum values for a | | | 32-bit signed integer). However, before PHP 5.1.0 | | | this range was limited from 01-01-1970 to | | | 19-01-2038 on some systems (e.g. Windows). | | | | | 5.1.1 | | | | | | | There are useful constants of standard date/time | | | formats that can be used to specify the $format | | | parameter. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 gmdate(3) example When run in Finland (GMT +0200), the first line below prints "Jan 01 1998 00:00:00", while the second prints "Dec 31 1997 22:00:00". <?php echo date("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998)); echo gmdate("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998)); ?> SEE ALSO
date(3), mktime(3), gmmktime(3), strftime(3). PHP Documentation Group GMDATE(3)
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