1..::lib::Smokeping::matchers::MedratSimoo.(k.3e:)P:ilnigb::Smokeping::matchers::Medratio(3)
2
3
4

NAME

6       Smokeping::matchers::Medratio - detect changes in the latency median
7

OVERVIEW

9       The Medratio matcher establishes a historic median latency over several
10       measurement rounds. It compares this median, against a second median
11       latency value again build over several rounds of measurement.
12
13       By looking at the median value this matcher is largly imune against
14       spikes and will only react to long term developments.
15

DESCRIPTION

17       Call the matcher with the following sequence:
18
19        type = matcher
20        pattern =  Medratio(historic=>a,current=>b,comparator=>o,percentage=>p)
21
22       historic
23           The number of values to use for building the 'historic' median.
24
25       current
26           The number of values to use for building the 'current' median.
27
28       comparator
29           Which comparison operator should be used to compare
30           current/historic with percentage.
31
32       percentage
33           Right hand side of the comparison.
34
35         old <--- historic ---><--- current ---> now
36

EXAMPLE

38       Take  the 12 last median values. Build the median out of the first 10
39       and the median from the other 2 values. Divide the results and decide
40       if it is bigger than 150 percent.
41
42        Medratio(historic=>10,current=>2,comparator=>'>',percentage=>150);
43
44        med(current)/med(historic) > 150/100
45
46       This means the matcher will activate when the current latency median is
47       more than 1.5 times the historic latency median established over the
48       last 10 rounds of measurement.
49

51       Copyright (c) 2006 by OETIKER+PARTNER AG. All rights reserved.
52

SPONSORSHIP

54       The development of this matcher has been paied for by Virtela
55       Communications, <http://www.virtela.net/>.
56

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.
62
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.
67
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.
71

AUTHOR

73       Tobias Oetiker <tobi@oetiker.ch>
74
75
76
772.7.3                             2021.-.0:7:-l2i3b::Smokeping::matchers::Medratio(3)
Impressum