Date: Wed, 23 Dec 2009 16:16:48 GMT From: Stepan Koltsov <yozh@mx1.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/141920: sort -k 3,1g is very slow Message-ID: <200912231616.nBNGGmYI012674@www.freebsd.org> Resent-Message-ID: <200912231620.nBNGK1wC006946@freefall.freebsd.org>
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>Number: 141920
>Category: misc
>Synopsis: sort -k 3,1g is very slow
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Dec 23 16:20:01 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: Stepan Koltsov
>Release: 7.2
>Organization:
>Environment:
7.2-STABLE amd64
>Description:
sort -k 3,1g is very slow.
>How-To-Repeat:
1. Generate a file:
for i in {1..10000}; do echo 1261583423 a a; done > txt
(10000 lines "1261583423 a a")
2. Run sort with simpler options:
time cat txt | sort -k 3,1 > /dev/null
time cat txt | sort -k 3,1n > /dev/null
time cat txt | sort -k 1g > /dev/null
time cat txt | sort -k 2,1g > /dev/null
All these commands work fast (in 0.03s).
3. Run sort wih -k 3,1g:
time cat txt | sort -k 3,1g > /dev/null
It takes 4 seconds. It is too long.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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