1..::lib::Smokeping::matchers::AvgratSimoo.(k.3e:)P:ilnigb::Smokeping::matchers::Avgratio(3)
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NAME

6       Smokeping::matchers::Avgratio - detect changes in average median
7       latency
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OVERVIEW

10       The Avgratio matcher establishes a historic average median latency over
11       several measurement rounds. It compares this average, against a second
12       average latency value again build over several rounds of measurement.
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DESCRIPTION

15       Call the matcher with the following sequence:
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17        type = matcher
18        pattern =  Avgratio(historic=>a,current=>b,comparator=>o,percentage=>p)
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20       historic
21           The number of median values to use for building the 'historic'
22           average.
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24       current
25           The number of median values to use for building the 'current'
26           average.
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28       comparator
29           Which comparison operator should be used to compare
30           current/historic with percentage.
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32       percentage
33           Right hand side of the comparison.
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35         old <--- historic ---><--- current ---> now
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EXAMPLE

38       Take build the average median latency over 10 samples, use this to
39       divide the current average latency built over 2 samples and check if it
40       is bigger than 150%.
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42        Avgratio(historic=>10,current=>2,comparator=>'>',percentage=>150);
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44        avg(current)/avg(historic) > 150/100
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46       This means the matcher will activate when the current latency average
47       is more than 1.5 times the historic latency average established over
48       the last 10 rounds of measurement.
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51       Copyright (c) 2004 by OETIKER+PARTNER AG. All rights reserved.
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SPONSORSHIP

54       The development of this matcher has been sponsored by Virtela
55       Communications, <http://www.virtela.net/>.
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LICENSE

58       This program is free software; you can redistribute it and/or modify it
59       under the terms of the GNU General Public License as published by the
60       Free Software Foundation; either version 2 of the License, or (at your
61       option) any later version.
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63       This program is distributed in the hope that it will be useful, but
64       WITHOUT ANY WARRANTY; without even the implied warranty of
65       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
66       General Public License for more details.
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68       You should have received a copy of the GNU General Public License along
69       with this program; if not, write to the Free Software Foundation, Inc.,
70       675 Mass Ave, Cambridge, MA 02139, USA.
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AUTHOR

73       Tobias Oetiker <tobi@oetiker.ch>
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772.8.2                             2022.-.0:1:-l2i2b::Smokeping::matchers::Avgratio(3)
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