On Tue, Sep 21, 2010 at 7:55 PM, Henrik Sperre Johansen <
[email protected]> 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).
headerBytes :=
contentBytes > 255
ifTrue: [12]
ifFalse: [isCompact ifTrue: [4] ifFalse: [8]].
(UnusedObjectDiscoverer current primitiveGetUsedBit:
inst) ifTrue:
[total := total + headerBytes + contentBytes]].
^ total]
ifFalse: [
headerBytes :=
instVarBytes > 255
ifTrue: [12]
ifFalse: [isCompact ifTrue: [4] ifFalse: [8]].
^ instCount * (headerBytes + instVarBytes)].
SparseLargeTable instanceCount ->>> 2
SpaceTally new spaceForUsedInstancesOf: SparseLargeTable withInstanceCount:
2 ->>> 7341112
thanks
>
>
>> 2) If I don't use UTF and I send an encoding as parameter in the VM
>> (different from UTF), do I need this class side variables?
>>
> What Lukas said.
>
> Cheers,
> Henry
>
>
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