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Top Forums UNIX for Advanced & Expert Users Help optimizing sort of large files Post 302925636 by Corona688 on Tuesday 18th of November 2014 10:56:14 AM
Old 11-18-2014
You could also check out external sorting. Since you know the data is much larger than RAM, this may be higher performance since it's purely sequential. You can control exactly how much your disk is being hit by what when.

Basically, split your n-terabyte file into chunks small enough to fit purely in memory -- 50% of memory size is a good guess -- and sort them, then merge them. This will give you full control of how many files are being read when, to the point the limit becomes disk speed (as it always was, ideally).
 

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ARORA-CACHEINFO(1)					      General Commands Manual						ARORA-CACHEINFO(1)

NAME
arora-cacheinfo - a tool for extracting files and metadata out of Arora cache files. SYNOPSIS
arora-cacheinfo [-o cachefile] [file | url] DESCRIPTION
Arora-cacheinfo is a tool for extracting files and displaying metadata out of an Arora cache files that are stored on the disk. Every cache file contains both the cached file (sometimes compressed) and metadata associated with it such as expiration date. Cache files names always include the md5sum of the url and passing a url to arora-cacheinfo.1 will automatically determine the correct matching cache file name. OPTIONS
-o cachefile Write the cached file if it exists to cachefile file Specify the file to read from. url Specify the url from which to compute the file to read from. BUGS Please report bugs to http://code.google.com/p/arora/issues/list. AUTHOR
The author of arora-cacheinfo is Benjamin C. Meyer <ben@meyerhome.net>. This manual page was written by Benjamin C. Meyer <ben@meyerhome.net> Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. July 2009 ARORA-CACHEINFO(1)
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