Re: [Caml-list] compact.c

Re: [Caml-list] compact.c

[Damien Doligez]

>From: Julie Farago <farago@eecs.harvard.edu>
>
>Is there a paper on the compaction code (compact.c) of the garbage
>collector (in byterun/)? Even though the documentation in this file is
>really exceptional, I am a little confused by how the inversion of
>pointers is used to compact the heap. Is there an algorithm I should
>lookup?

There is no paper on compact.c itself, but the algorithm is not
original.  If I remember correctly, it is from this paper:

F. Lockwood Morris, A time- and space-efficient garbage compaction
algorithm, Communications of the ACM, v.21 n.8, p.662-665, Aug. 1978

The only tricky part is the double inversion of pointers to infix
headers.  If you really need it, I'll write up a short description and
put it on my web page.

-- Damien
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[Caml-list] compact.c

[Julie Farago]

Hello,

Is there a paper on the compaction code (compact.c) of the garbage
collector (in byterun/)? Even though the documentation in this file is
really exceptional, I am a little confused by how the inversion of
pointers is used to compact the heap. Is there an algorithm I should
lookup?

Thanks a lot!
-Julie

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