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Re: [PATCH] Configure GMP to use GC allocation functions, remove bignum

From: Andy Wingo
Subject: Re: [PATCH] Configure GMP to use GC allocation functions, remove bignum finalizers
Date: Fri, 02 Dec 2011 12:10:55 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)

On Sun 27 Nov 2011 22:25, address@hidden (Ludovic Courtès) writes:

> A longer term option may be to augment libgc with something akin to our
> old scm_gc_register_collectable_memory.

This is also necessary, as it turns out.  I added
scm_gc_register_allocation, which will simply run a GC every so often.

Currently the heuristic is that when GC runs, a counter is reset to be
equal to the current GC heap size.  scm_gc_register_allocation(size_t)
decrements this counter.  When it wraps around, we run GC.

I made scm_realloc call scm_gc_register_allocation.  I also installed
custom gmp allocators that call scm_malloc and friends -- so the same
allocators, but instrumented.  (Because we hard-coded `free' already in
the printer, we know that this shouldn't break anything.)

That makes the `(factorial 100000)' test take twice as long to run (6
seconds vs 3 seconds), because GC ran 1000 times instead of 15 times,
but it kept the memory image size to 18 MB instead of 1800 MB.


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