Re: Merging scratch/no-purespace to remove unexec and purespace

[Helmut Eller <eller.helmut@gmail.com>]

On Tue, Dec 17 2024, Stefan Monnier wrote:

>> Do you have an estimate what removing purespace will cost in terms of GC
>> time?  I mean something like "1ms per collection".  Or perhaps a
>> suggestion how I could measure it?
>
> In the pdump case it should have no effect at all, or maybe even
> a slight *speedup*.
>
> That's because the pdump already fails to take advantage of the
> purespace (i.e. the GC traces through the purespace like the rest of
> the heap).

So the pdumper copies objects from purespace to the dump like normal
objects; when loading the dump, purespace stays empty.

I had (wrongly) assumed that the pdumper creates a separate section for
pure objects.  Creating such a section sounds easy enough (hmm, maybe
not so easy because of hashtables).  Still not sure if it would be worth
the effort.

Helmut