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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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uri_urn(n)					    Tcl Uniform Resource Identifier Management						uri_urn(n)

__________________________________________________________________________________________________________________________________________________

NAME
uri_urn - URI utilities, URN scheme SYNOPSIS
package require Tcl 8.2 package require uri::urn ?1.1.2? uri::urn::quote url uri::urn::unquote url _________________________________________________________________ DESCRIPTION
This package provides two commands to quote and unquote the disallowed characters for url using the urn scheme, registers the scheme with the package uri, and provides internal helpers which will be automatically used by the commands uri::split and uri::join of package uri to handle urls using the urn scheme. COMMANDS
uri::urn::quote url This command quotes the characters disallowed by the urn scheme (per RFC 2141 sec2.2) in the url and returns the modified url as its result. uri::urn::unquote url This commands performs the reverse of ::uri::urn::quote. It takes an urn url, removes the quoting from all disallowed characters, and returns the modified urls as its result. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category uri of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. KEYWORDS
rfc 2141, uri, url, urn CATEGORY
Networking uri 1.1.2 uri_urn(n)
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