nice analysis.
I really hope that using smarter class structure based on Slot we can offer a solution in the future.

On Aug 29, 2013, at 6:24 PM, Stephan Eggermont <stephan@stack.nl> wrote:

> Currently, quite a lot of space seem to be taken up by not-filled instvars.
> In my Delphi based Whitestar model, 406085 out of 664371
> are either nil or empty sets. In a JHotDraw model from inFusion
> it is 724408 out of 1351527
>
> Stephan
>
>
> FAMeasurements>measure
>       varSize := mClass instSize.
>       instSize := mClass allInstances size.
>       nrNil := 0.
>       nrEmpty := 0.
>       mClass allInstancesDo: [ :instance |
>               1 to: varSize do: [:varIndex | |value|
>                       value := instance instVarAt: varIndex.
>                       value ifNil: [ nrNil := nrNil+1 ].
>                       value isCollection ifTrue: [
>                               value ifEmpty: [ nrEmpty := nrEmpty+1 ] ] ] ]
>
> MeasureFAMIX>initializeMeasurements
>       FAMIXEntity withAllSubclassesDo: [ :each |
>               self measurements add: (FAMeasurements new
>                 mClass: each;
>                 yourself). ]
>
> MeasureFAMIX>run
>       self initializeMeasurements.
>       measurements do: [ :each | each measure]
>
> MeasureFAMIX>sum
>       nrOfVars := 0.
>       nrEmpty := 0.
>       measurements do: [ :measurement |
>               nrOfVars := nrOfVars + (measurement varSize * measurement instSize).
>               nrEmpty := nrEmpty + measurement nrEmpty + measurement nrNil].
>
> In Famix-SelfMeasurements on smalltalkhub
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