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[Gcl-devel] Re: dynamic-extent make-list initialization error?
From: |
Camm Maguire |
Subject: |
[Gcl-devel] Re: dynamic-extent make-list initialization error? |
Date: |
12 Dec 2005 09:59:44 -0500 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 |
Greetings!
Robert Boyer <address@hidden> writes:
> > BTW are we done on the after gbc hook?
>
> Yes, as far as I can tell. Thanks very much.
>
> I have mostly given up on the big-array with forged conses to hash consing
> approach because I realized that I was simply stupid. GCL's GC does not
> trace pointers from the stack into fixnum arrays, and quite reasonably so.
> That was why some things were not getting marked.
>
> Yesterday, we tried a new hack of putting the big hons array on the stack,
> using stack conses, and that worked remarkably well. Even with a make-list
> 100000000! An advantage of that is that it is putting the honses above the
> 2gb mark, leaving space below for other Lisp objects! Alas, this approach
> suffers from the fact that no one is gc'ing the honses automatically, so we
> have to periodically wipe them all out, as we were doing doing with the
> older, strictly ANSI-conforming (no si::nani or si::address), approach to
> hons.
>
Wow, so I guess you must be providing your own toplevel to avoid
popping the stack above your hons allocation. Great!
> I'm still happily using the *after-gbc-hook* hack to implement a sort of
> "weak alist", that maps conses to possibly big hash tables. If the GC marks
> the conses as free, I can let the hash tables go.
>
Is this solid enough that I can now omit the older calling pattern in
the alloc functions now commented out? Have you encountered any other
anomalies since that recursive GBC fix?
Take care,
> Thanks so very much,
>
> Bob
>
> P. S. I'll check out the make-list initialization fix right now.
>
>
>
>
--
Camm Maguire address@hidden
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