smokeping_matchers_medratio(3) [debian man page]
..::lib::Smokeping::matchers::Medratio(3) SmokePing ..::lib::Smokeping::matchers::Medratio(3) NAME
Smokeping::matchers::Medratio - detect changes in the latency median OVERVIEW
The Medratio matcher establishes a historic median latency over several measurement rounds. It compares this median, against a second median latency value again build over several rounds of measurement. By looking at the median value this matcher is largly imune against spikes and will only react to long term developments. DESCRIPTION
Call the matcher with the following sequence: type = matcher pattern = Medratio(historic=>a,current=>b,comparator=>o,percentage=>p) historic The number of values to use for building the 'historic' median. current The number of values to use for building the 'current' median. comparator Which comparison operator should be used to compare current/historic with percentage. percentage Right hand side of the comparison. old <--- historic ---><--- current ---> now EXAMPLE
Take the 12 last median values. Build the median out of the first 10 and the median from the other 2 values. Divide the results and decide if it is bigger than 150 percent. Medratio(historic=>10,current=>2,comparator=>'>',percentage=>150); med(current)/med(historic) > 150/100 This means the matcher will activate when the current latency median is more than 1.5 times the historic latency median established over the last 10 rounds of measurement. COPYRIGHT
Copyright (c) 2006 by OETIKER+PARTNER AG. All rights reserved. SPONSORSHIP
The development of this matcher has been paied for by Virtela Communications, <http://www.virtela.net/>. 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
Tobias Oetiker <tobi@oetiker.ch> 2.6.8 2012-02-26 ..::lib::Smokeping::matchers::Medratio(3)
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..::lib::Smokeping::sorters::base(3) SmokePing ..::lib::Smokeping::sorters::base(3) NAME
Smokeping::sorters::base - Base Class for implementing SmokePing Sorters OVERVIEW
Sorters are at the core of the SmokePing Charts feature, where the most interesting graphs are presented on a single page. The Sorter decides which graphs are considerd interesting. Every sorter must inherit from the base class and provide it's own methods for the 'business' logic. In order to maintain a decent performance the sorters activity is split into two parts. The first part is active while the smokeping daemon gathers its data. Whenever data is received, the sorter is called to calculate a 'value' for the present data. On every 'query round' this information is stored in the sorter store directory. Each smokeping process stores it's own information. Since smokeping can run in multiple instances at the same time, the data may be split over several files The second part of the sorter is called from smokeping.cgi. It loads all the information from the sorter store and integrates it into a single 'tree'. It then calls each sorter with the pre-calculated data to get it sorted and to and to select the interesting information. DESCRIPTION
Every sorter must provide the following methods: new The new method expects hash elements as an argument eg new({x=>'d+',y=>'d+'},x=>1,y=>2). The first part is a syntax rule for the arguments it should expect and the second part are the arguments itself. The first part will be supplied by the child class as it calls the parent method. Desc Simply return the description of the function. This method must be overwritten by a children of the base class. SortTree Returns an array of 'targets'. It is up to the sorter to decide how many entries the list should contain. If the list is empty, the whole entry will be supressed in the webfrontend. The methode gets access to all the targets in the system, together with the last data set acquired for each target. CalcValues Figure out the curent sorting value using te following input. $info = { uptime => w, loss => x, median => y, alert => z, # (0/1) pings => [qw(a b c d)] } The output can have any structure you want. It will be returned to the sorter method for further processng. COPYRIGHT
Copyright (c) 2007 by OETIKER+PARTNER AG. All rights reserved. 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
Tobias Oetiker <tobi@oetiker.ch> 2.6.8 2012-02-26 ..::lib::Smokeping::sorters::base(3)