Smokeping::matchers::Median(3)     SmokePing    Smokeping::matchers::Median(3)



NNAAMMEE
       Smokeping::matchers::Median - Find persistant changes in latency

OOVVEERRVVIIEEWW
       The idea behind this matcher is to find sustained changes in latency.

       The median matcher takes a number of past median latencies. It splits
       the latencies into two groups (old and new) and again finds the median
       for each groups. If the difference between the two medians is bigger
       than a certain value, it will give a match.

DDEESSCCRRIIPPTTIIOONN
       Call the matcher with the following sequence:

        type = matcher
        pattern =  Median(old=>x,new=>y,diff=>z)

       This will create a matcher which consumes x+y latency-datapoints,
       builds the two medians and the matches if the difference between the
       median latency is larger than z seconds.

CCOOPPYYRRIIGGHHTT
       Copyright (c) 2004 by OETIKER+PARTNER AG. All rights reserved.

LLIICCEENNSSEE
       This program is free software; you can redistribute it and/or modify it
       under the terms of the GNU General Public License as published by the
       Free Software Foundation; either version 2 of the License, or (at your
       option) any later version.

       This program is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
       Public License for more details.

       You should have received a copy of the GNU General Public License along
       with this program; if not, write to the Free Software Foundation, Inc.,
       675 Mass Ave, Cambridge, MA 02139, USA.

AAUUTTHHOORR
       Tobias Oetiker <tobi@oetiker.ch>



2.3.6                             2007-01-13    Smokeping::matchers::Median(3)
