On Jul 8, 2009, at 22:13, Roger Pack wrote:

> Typically for me the GC spends about 50% of its time in mark phase,
> 50% in sweep phase.  Around there somewhere.
>
> Question.  Would it be possible to do the sweep phase in a separate  
> thread?

There are many research papers on this topic, you can probably find  
some by googling.