03-17-2011
Add "historic pre-misconception" (if that's a word) and I think we've cracked it!
Why it was popular in the 1980's (at least it's "inferior" precursor - csh) is fairly clear. Why anyone uses it today is clearly baffling!
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LEARN ABOUT DEBIAN
smokeping_matchers_avgratio
..::lib::Smokeping::matchers::Avgratio(3) SmokePing ..::lib::Smokeping::matchers::Avgratio(3)
NAME
Smokeping::matchers::Avgratio - detect changes in average median latency
OVERVIEW
The Avgratio matcher establishes a historic average median latency over several measurement rounds. It compares this average, against a
second average latency value again build over several rounds of measurement.
DESCRIPTION
Call the matcher with the following sequence:
type = matcher
pattern = Avgratio(historic=>a,current=>b,comparator=>o,percentage=>p)
historic
The number of median values to use for building the 'historic' average.
current
The number of median values to use for building the 'current' average.
comparator
Which comparison operator should be used to compare current/historic with percentage.
percentage
Right hand side of the comparison.
old <--- historic ---><--- current ---> now
EXAMPLE
Take build the average median latency over 10 samples, use this to divide the current average latency built over 2 samples and check if it
is bigger than 150%.
Avgratio(historic=>10,current=>2,comparator=>'>',percentage=>150);
avg(current)/avg(historic) > 150/100
This means the matcher will activate when the current latency average is more than 1.5 times the historic latency average established over
the last 10 rounds of measurement.
COPYRIGHT
Copyright (c) 2004 by OETIKER+PARTNER AG. All rights reserved.
SPONSORSHIP
The development of this matcher has been sponsored by Virtela Communications, <http://www.virtela.net/>.
LICENSE
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
MERCHANTABILITY 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.
AUTHOR
Tobias Oetiker <tobi@oetiker.ch>
2.6.8 2012-02-26 ..::lib::Smokeping::matchers::Avgratio(3)