EWMA class

An exponentially-weighted moving average.

See :

• UNIX Load Average Part 1: How It Works
• UNIX Load Average Part 2: Not Your Average Average
• EMA

Constructors

EWMA(double _alpha, Duration _expectedTickInterval)

Create a new EWMA with a specific smoothing constant _alpha and the expected tick interval _expectedTickInterval.

EWMA.fifteenMinuteEWMA()

Creates a new EWMA which is equivalent to the UNIX fifteen minute load average and which expects to be ticked every 5 seconds.

EWMA.fiveMinuteEWMA()

Creates a new EWMA which is equivalent to the UNIX five minute load average and which expects to be ticked every 5 seconds.

EWMA.likeUnixLoadAverage(Duration unixLoadAverageDuration, Duration expectedTickInterval)

EWMA.oneMinuteEWMA()

Creates a new EWMA which is equivalent to the UNIX one minute load average and which expects to be ticked every 5 seconds.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

getRate(Duration duration) → double

Returns the rate in the given duration.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

tick() → void

Mark the passage of time (every microseconds) and decay the current rate accordingly.

toString() → String

A string representation of this object.

inherited

update(int n) → void

Update the moving average with a new value n.

Operators

operator ==(Object other) → bool

The equality operator.

inherited