[Vm-dev] VM Maker: Cog-eem.98.mcz

[Frank Shearar]

On 21 September 2013 15:41,  <commits at source.squeak.org> wrote:
>
> Eliot Miranda uploaded a new version of Cog to project VM Maker:
> http://source.squeak.org/VMMaker/Cog-eem.98.mcz
>
> ==================== Summary ====================
>
> Name: Cog-eem.98
> Author: eem
> Time: 21 September 2013, 7:41:44.069 am
> UUID: 8027e935-f7b0-417a-be44-954c5765582d
> Ancestors: Cog-eem.97
>
> fix a couple of comments
>
> =============== Diff against Cog-eem.97 ===============
>
> Item was changed:
>   ----- Method: SpurBootstrap class>>SmalltalkImagePROTOTYPEsetGCParameters (in category 'method prototypes') -----
>   SmalltalkImagePROTOTYPEsetGCParameters
>         "Adjust the VM's default GC parameters to avoid too much tenuring.
>          Maybe this should be left to the VM?"
>
>         | proportion edenSize survivorSize averageObjectSize numObjects |
>         proportion := 0.9. "tenure when 90% of pastSpace is full"
>         edenSize := SmalltalkImage current vmParameterAt: 44.
> +       survivorSize := edenSize / 5.0. "David's paper uses 140Kb eden + 2 x 28kb survivor spaces; Spur uses the same ratios :-)"
> -       survivorSize := edenSize / 5.0. "David's paper uses 140Kb eden + 2 x 28kb survivor spaces; Spur does the same :-)"
>         averageObjectSize := 8 * self wordSize. "a good approximation"
>         numObjects := (proportion * survivorSize / averageObjectSize) rounded.
>         SmalltalkImage current vmParameterAt: 6 put: numObjects  "tenure when more than this many objects survive the GC"!
>
> Item was changed:
>   ----- Method: SpurBootstrap class>>SystemDictionaryPROTOTYPEsetGCParameters (in category 'method prototypes') -----
>   SystemDictionaryPROTOTYPEsetGCParameters
>         "Adjust the VM's default GC parameters to avoid too much tenuring.
>          Maybe this should be left to the VM?"
>
>         | proportion edenSize survivorSize averageObjectSize numObjects |
>         proportion := 0.9. "tenure when 90% of pastSpace is full"
>         edenSize := SmalltalkImage current vmParameterAt: 44.
> +       survivorSize := edenSize / 5.0. "David's paper uses 140Kb eden + 2 x 28kb survivor spaces; Spur uses the same ratios :-)"

I presume that's David Ungar? Which paper is it?

Thanks!

frank