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Manual Reference Pages  -  SMOKEPING_MATCHERS_EXPLOSS (3)

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NAME

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

CONTENTS

DESCRIPTION

Match against exponential weighted average of last samples, thus new values are more valuable as old ones. Two thresholds - rising and falling - produce hysteresis loop like in RMON alert subsystem. If the average reaches the rising threshold, matcher go to the match state and hold It until the average drops under the falling threshold.

Call the matcher with the following sequence:



 type = matcher
 pattern =  CheckLoss(hist => <hist>, rising=><rising> \
                     [,falling => <falling>] [,skip=><stat>] [,fast=><fast>])



Arguments:
hist - number of samples to weight against; weight will be disposed with
exponetial decreasing manner from newest to oldest, so that the
oldest sample would have 1% significance;
rising - rising threshold for packet loss, 0-100%
falling - falling threshold for packet loss, default is <rising>
skip - skip <skip> number of samples after startup before fire alerts.
fast - use <fast> samples for fast transition: if the values of last <fast>
samples more then <rising> - take match state, if less then
<falling> - take no match state.

Note:
If the actual history is less then <hist> value then this value is taken
as the actual history.

COPYRIGHT

Copyright (c) 2008 Veniamin Konoplev

Developed in cooperation with EU EGEE project

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

Veniamin Konoplev <vkonoplev@acm.org>
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2.6.11 ..::LIB::SMOKEPING::MATCHERS::EXPLOSS (3) 2011-10-05

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