Reviving this old mail from Guillaume.

I did an analysis on a huge model (>2M entities) we have:
- .mse file: 372.5 MB
- .image file without the model: 86.9 MB
- image with model: 692.8 MB (thus apparently 605,9 MB used by the model)

Then I did a small experiment: I removed the four instance variables of FAMIXSourcedEntity (sourceAnchor, sourceLanguage, comments, declaredSourceLanguage) and replaced them by variables in the privateState

for example:

FAMIXSourcedEntity>>comments
    "Returns the list of comments defined for the entity."
    
    <MSEProperty: #comments type: #FAMIXComment opposite: #container> <multivalued> <derived>
    <MSEComment: 'list of comments defined in the entity'>
    
    ^comments

becomes

Thanks

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

For the empty collection having a kind of
    - sharing an #() in a classVar
    - creating a new collection on use could be a solution.

Le 7/11/16 à 12:16, Guillaume Larcheveque a écrit :

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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-- 
Nicolas Anquetil -- MCF (HDR)
Project-Team RMod