<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Avgratio</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body style="background-color: white"> <p><a name="__index__"></a></p> <!-- INDEX BEGIN --> <!-- <ul> <li><a href="#name">NAME</a></li> <li><a href="#overview">OVERVIEW</a></li> <li><a href="#description">DESCRIPTION</a></li> <li><a href="#example">EXAMPLE</a></li> <li><a href="#copyright">COPYRIGHT</a></li> <li><a href="#sponsorship">SPONSORSHIP</a></li> <li><a href="#license">LICENSE</a></li> <li><a href="#author">AUTHOR</a></li> </ul> --> <!-- INDEX END --> <p> </p> <h1><a name="name">NAME</a></h1> <p>Smokeping::matchers::Avgratio - detect changes in average median latency</p> <p> </p> <hr /> <h1><a name="overview">OVERVIEW</a></h1> <p>The Avgratio matcher establishes a historic average median latency over several measurement rounds. It compares this average, against a second average latency value again build over several rounds of measurement.</p> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>Call the matcher with the following sequence:</p> <pre> type = matcher pattern = Avgratio(historic=>a,current=>b,comparator=>o,percentage=>p)</pre> <dl> <dt><strong><a name="item_historic">historic</a></strong> </dt><dd> <p>The number of median values to use for building the 'historic' average.</p> </dd><dt><strong><a name="item_current">current</a></strong> </dt><dd> <p>The number of median values to use for building the 'current' average.</p> </dd><dt><strong><a name="item_comparator">comparator</a></strong> </dt><dd> <p>Which comparison operator should be used to compare current/historic with percentage.</p> </dd><dt><strong><a name="item_percentage">percentage</a></strong> </dt><dd> <p>Right hand side of the comparison.</p> </dd></dl> <pre> old <--- historic ---><--- current ---> now</pre> <p> </p> <hr /> <h1><a name="example">EXAMPLE</a></h1> <p>Take build the average median latency over 10 samples, use this to divide the current average latency built over 2 samples and check if it is bigger than 150%.</p> <pre> Avgratio(historic=>10,current=>2,comparator=>'>',percentage=>150);</pre> <pre> avg(current)/avg(historic) > 150/100</pre> <p>This means the matcher will activate when the current latency average is more than 1.5 times the historic latency average established over the last 10 rounds of measurement.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright (c) 2004 by OETIKER+PARTNER AG. All rights reserved.</p> <p> </p> <hr /> <h1><a name="sponsorship">SPONSORSHIP</a></h1> <p>The development of this matcher has been sponsored by Virtela Communications, <a href="http://www.virtela.net/">http://www.virtela.net/</a>.</p> <p> </p> <hr /> <h1><a name="license">LICENSE</a></h1> <p>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.</p> <p>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.</p> <p>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.</p> <p> </p> <hr /> <h1><a name="author">AUTHOR</a></h1> <p>Tobias Oetiker <<a href="mailto:tobi@oetiker.ch">tobi@oetiker.ch</a>></p> </body> </html>
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Mandriva
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2010.0
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i586
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media
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contrib-release
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by-pkgid
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d97b4c58d8763adc61a7b020afdfd868
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files
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