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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" Smokeping::matchers::ExpLoss \- exponential weighting matcher for packet loss with RMON\-like thresholds .SH "DESCRIPTION" .IX Header "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 \s-1RMON\s0 alert subsystem. If the average reaches the \&\*(L"rising\*(R" threshold, matcher go to the \*(L"match\*(R" state and hold It until the average drops under the \*(L"falling\*(R" threshold. .PP Call the matcher with the following sequence: .PP .Vb 3 \& type = matcher \& pattern = CheckLoss(hist => , rising=> \e \& [,falling => ] [,skip=>] [,fast=>]) .Ve .PP 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 skip \- skip number of samples after startup before \*(L"fire\*(R" alerts. fast \- use samples for fast transition: if the values of last samples more then \- take \*(L"match\*(R" state, if less then \- take \*(L"no match\*(R" state. .PP Note: If the actual history is less then value then this value is taken as the actual history. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright (c) 2008 Veniamin Konoplev .PP Developed in cooperation with \s-1EU EGEE\s0 project .SH "LICENSE" .IX Header "LICENSE" This program is free software; you can redistribute it and/or modify it under the terms of the \s-1GNU\s0 General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. .PP This program is distributed in the hope that it will be useful, but \s-1WITHOUT ANY WARRANTY\s0; without even the implied warranty of \&\s-1MERCHANTABILITY\s0 or \s-1FITNESS FOR A PARTICULAR PURPOSE.\s0 See the \&\s-1GNU\s0 General Public License for more details. .PP You should have received a copy of the \s-1GNU\s0 General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, \s-1MA 02139, USA.\s0 .SH "AUTHOR" .IX Header "AUTHOR" Veniamin Konoplev