fjh at cs.mu.oz.au
Wed Sep 17 07:11:59 AEST 1997
Dominique de Waleffe wrote:
> Is there a way to diminish the # of GCs by letting the memory grow to
> a lot more?
Yes. You can set the `GC_free_space_divisor' variable
(using the C interface) to a smaller value.
/* We try to make sure that we allocate at */
/* least N/GC_free_space_divisor bytes between */
/* collections, where N is the heap size plus */
/* a rough estimate of the root set size. */
/* Initially, GC_free_space_divisor = 4. */
/* Increasing its value will use less space */
/* but more collection time. Decreasing it */
/* will appreciably decrease collection time */
/* at the expense of space. */
/* GC_free_space_divisor = 1 will effectively */
/* disable collections. */
So try setting GC_free_space_divisor to 3 or 2.
> Apparently setting MERCURY_OPTIONS='-sh2000' does not
> have an effect.
Yes, the `-sh' option only has effect for grades without GC,
and you don't want that, because as you found out, you'll
run out of memory.
> Also on NT (Cygnus beta-17,no patch) the time reported by
> report_stats is always 0. Is that a Cygnus or Mercury problem?
I think it is a Cygnus problem.
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