[DGD] dump/restore

[bart at wotf.org]

On Sun, 23 Dec 2007 00:35:26 +0100, Felix A. Croes wrote
> bart at wotf.org wrote:
> 
> > While investigating my dump/restore issue, I stumbled upon o_sweep().
> > I noticed it is called after a dump or restore. I'm curious as to why it is
> > called after a dump, I'd somewhat expect it to happen before a dump?
> 
> I'm not sure why you should think so.

Due to misunderstanding what the thing did.. :)

> 
> The function accomplishes two things.  First, it marks every object
> as present in the dump file, rather than the swap file.  Second,
> it changes the "count" field of each object and prepares to also
> change it in each object reference later, while the swap file is
> rebuilt.  Running this function just before a state dump, instead
> of just after, would probably turn a lot of object references in
> that state dump into nil values, though if you're lucky and no
> objects were added or removed after the previous statedump, it
> might not.

Thanks for the explanation, it clears up a few things for me.

Bart.
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