[MLton] RE: card/cross map in heap

[Matthew Fluet]

On Thu, 17 Jul 2008, Stephen Weeks wrote:
>> The problem with fixed-heap, though, is that the runtime starts off trying
>> to use the Cheney-copy collector (so, it really grabs 1/2 * 3.5G) and it may
>> be some time before it is forced to use the mark-compact collector
>
> Isn't there some way to force the runtime to start using mark compact
> immediately (or if not, wouldn't it be easy to do)?

There is no direct means.  The FORCE_MARK_COMPACT is a debugging constant. 
In theory, some appropriate tweaking of the various *-ratio runtime 
options should force the mark compact, but the right tweaking isn't 
obvious to me.

Yes, it would be pretty easy to put in a forcing control.