Thanks

A task of Pavel will be to see how slots usage can reduce that space lost.

Hi Moose users,

as you may know, at Synectique we experiment lots of issues about memory usage.

That's why i had a look at the number of unused instance variables in one of our system loaded with a big model from one of our main customer.

Total instance variables: 26.852.653

Used instance variables: 17.393.938

Empty collections: 5.023.508

Recoverable instance variables: 14.482.223

The recoverable instance variables are those with nil or an empty collection (or MultiValueLink)

As you can see, we can save a lot of memory :-)

Here is my (dirty) code to get that:

countUsedInstanceVariableInForSubInstances: aClass

| usedInstNbr instNbr emptyCollNbr |

usedInstNbr := 0.

instNbr := 0.

emptyCollNbr := 0.

aClass

allSubInstancesDo: [ :anEntity | 

instNbr := instNbr + anEntity class allInstVarNames size.

anEntity class allInstVarNames

doWithIndex: [ :e :i | 

(anEntity instVarAt: i)

ifNotNil: [ :content | 

([ 

content isEmpty.

emptyCollNbr := emptyCollNbr + 1.

false ]

on: MessageNotUnderstood

do: [ false ])

ifFalse: [ usedInstNbr := usedInstNbr + 1 ] ] ] ].

^ {('Used instance variables' -> usedInstNbr).

('empty collections' -> emptyCollNbr).

('Recoverable instance variables' -> (instNbr - (usedInstNbr - emptyCollNbr))).

('Total instance variables' -> instNbr)}

--

Guillaume Larcheveque

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