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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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libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)	User Contributed Perl Documentation  libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)

NAME
APR::Date - Perl API for APR date manipulating functions Synopsis use APR::Date (); # parse HTTP-complient date string $date_string = 'Sun, 06 Nov 1994 08:49:37 GMT'; $date_parsed = APR::Date::parse_http($date_string); # parse RFC822-complient date string $date_string = 'Sun, 6 Nov 94 8:49:37 GMT'; $date_parsed = APR::Date::parse_rfc($date_string); Description "APR::Socket" provides the Perl interface to APR date manipulating functions. API
"APR::Date" provides the following functions and/or methods: "parse_http" Parse HTTP date strings $date_parsed = parse_http($date_string); arg1: $date_string ( string ) The date string can be in one of the following formats: 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 refer to RFC2616 for the details (GMT is assumed, regardless of the used timezone). ret: $date_parsed ( number ) the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid. since: 2.0.00 Remember to divide the return value by 1_000_000 if you need it in seconds. "parse_rfc" Parse a string resembling an RFC 822 date. It's meant to be lenient in its parsing of dates. Hence, this will parse a wider range of dates than "parse_http()". $date_parsed = parse_rfc($date_string); arg1: $date_string ( string ) The date string can be in one of the following formats: 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 Sun, 6 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sun, 06 Nov 94 08:49:37 GMT ; RFC 822 Sun, 6 Nov 94 08:49:37 GMT ; RFC 822 Sun, 06 Nov 94 08:49 GMT ; Unknown [drtr@ast.cam.ac.uk] Sun, 6 Nov 94 08:49 GMT ; Unknown [drtr@ast.cam.ac.uk] Sun, 06 Nov 94 8:49:37 GMT ; Unknown [Elm 70.85] Sun, 6 Nov 94 8:49:37 GMT ; Unknown [Elm 70.85] ret: $date_parsed ( number ) the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid. since: 2.0.00 Remember to divide the return value by 1_000_000 if you need it in seconds. See Also mod_perl 2.0 documentation. Copyright mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0. Authors The mod_perl development team and numerous contributors. perl v5.14.2 2011-02-08 libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)
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