On Tue, Sep 21, 2010 at 7:55 PM, Henrik Sperre Johansen <henrik.s.johansen@veloxit.no> wrote:

 On 21.09.2010 19:10, Mariano Martinez Peck wrote:

Hi folks. I wasn't aware of the class SparseLargeTable but it seems it has two important instances "SparseLargeTable allInstances size -> 2"

They are the class side variables #DecimalProperty and #GeneralCategory in Unicode.

Actually,

(Unicode classPool at: 'GeneralCategory') size  -> 917632

(Unicode classPool at: 'DecimalProperty') size -> 917632

So...collections of almost 1 million elements.

Now a couple of questions:

1) Is this normal/expected?   In my calculus both arrays are like 3mb of memory

Look at the implementation, there's a reason they're called sparse.
If my math is correct (crosses fingers), DecimalProperty is ~15KB, GeneralCategory ~70KB

So...there must be a problem with my code, I was doing something like SpaceTally does:


spaceForUsedInstancesOf: aClass withInstanceCount: instCount
    "Answer the number of bytes consumed by all instances of the given class, including their object headers."

    | isCompact instVarBytes bytesPerElement headerBytes total |
    instCount = 0 ifTrue: [^ 0].
    isCompact := aClass indexIfCompact > 0.
    instVarBytes := aClass instSize * 4.
    aClass isVariable
        ifTrue: [
            bytesPerElement := aClass isBytes ifTrue: [1] ifFalse: [4].
            total := 0.
            aClass allInstancesDo: [:inst | | contentBytes |
                contentBytes := instVarBytes + (inst size * bytesPerElement).