Smokeping_matchers_Avgratio3

Overview

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.

Overview

Call the matcher with the following sequence:

 type = matcher
 pattern =  Avgratio(historic=>a,current=>b,comparator=>o,percentage=>p)

historic

The number of median values to use for building the 'historic' average.

current

The number of median values to use for building the 'current' average.

comparator

Which comparison operator should be used to compare current/historic with percentage.

percentage

Right hand side of the comparison.

  old <--- historic ---><--- current ---> now

Examples

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%.

 Avgratio(historic=>10,current=>2,comparator=>'>',percentage=>150);
 avg(current)/avg(historic) > 150/100

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.

Sponsorship

The development of this matcher has been sponsored by Virtela Communications, <http://www.virtela.net/>.