Moduleekg-core-0.1.2.0Haskell2010

System.Metrics.Distribution

This module defines a type for tracking statistics about a series of events. An event could be handling of a request and the value associated with the event -- the value you'd pass to add -- could be the amount of time spent serving that request (e.g. in milliseconds). All operations are thread safe.

2 types
10 values

Packageekg-core-0.1.2.0
Exports12
LanguageHaskell2010
LicenceBSD-3-Clause
SourceDistribution.hsc

newtypenewtype Distribution

An metric for tracking events.

valuenew :: IO Distribution

Create a new distribution.

valueadd :: Distribution -> Double -> IO ()

Add a value to the distribution.

valueaddN :: Distribution -> Double -> Int64 -> IO ()

Add the same value to the distribution N times. Mean and variance are computed according to http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Online_algorithm

valueread :: Distribution -> IO Stats

Get the current statistical summary for the event being tracked.

Gathered statistics

7 declarations

datadata Stats

Distribution statistics

Instances2Eq, Show

Eq StatsDefined in ekg-core-0.1.2.0 · System.Metrics.Distribution.Internal
Show StatsDefined in ekg-core-0.1.2.0 · System.Metrics.Distribution.Internal

valuemean :: Stats -> Double

Sample mean

valuevariance :: Stats -> Double

Biased sample variance

valuecount :: Stats -> Int64

Event count

valuesum :: Stats -> Double

Sum of values

valuemin :: Stats -> Double

Min value seen

valuemax :: Stats -> Double

Max value seen