1..::lib::Smokeping::matchers::ExpLosSsm(o3k.)e.P:i:nlgib::Smokeping::matchers::ExpLoss(3)
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NAME

6       Smokeping::matchers::ExpLoss - exponential weighting matcher for packet
7       loss with RMON-like thresholds
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DESCRIPTION

10       Match against exponential weighted average of last samples, thus new
11       values are more valuable as old ones. Two thresholds - rising and
12       falling - produce hysteresis loop like in RMON alert subsystem. If the
13       average reaches the "rising" threshold, matcher go to the "match" state
14       and hold It until the average drops under the "falling" threshold.
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16       Call the matcher with the following sequence:
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18        type = matcher
19        pattern =  CheckLoss(hist => <hist>, rising=><rising> \
20                            [,falling => <falling>] [,skip=><stat>] [,fast=><fast>])
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22       Arguments:
23        hist    - number of samples to weight against; weight will be disposed
24       with
25                  exponetial decreasing manner from newest to oldest, so that
26       the
27                  oldest sample would have 1% significance;
28        rising  - rising threshold for packet loss, 0-100%
29        falling - falling threshold for packet loss, default is <rising>
30        skip    - skip <skip> number of samples after startup before "fire"
31       alerts.
32        fast    - use <fast> samples for fast transition: if the values of
33       last <fast>
34                  samples more then <rising> - take "match" state, if less
35       then
36                  <falling> - take "no match" state.
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38       Note:
39        If the actual history is less then <hist> value then this value is
40       taken
41        as the actual history.
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44       Copyright (c) 2008 Veniamin Konoplev
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46       Developed in cooperation with EU EGEE project
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LICENSE

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

64       Veniamin Konoplev <vkonoplev@acm.org>
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682.7.3                             2021-.0.7:-:2l3ib::Smokeping::matchers::ExpLoss(3)
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