[concurrency-interest] Garbage First vs a counting collector
fw at deneb.enyo.de
Thu Mar 26 17:20:54 EDT 2009
* Jeremy Manson:
> 3) In the case where you are writing to a region you haven't already
> written, it is 2) plus a memory write to record the fact that you are
> writing to another region.
> Even 3) is orders of magnitude cheaper than a CAS. I'm not sure how
> expensive 4) is, but it doesn't happen all that often.
Depends on the CAS implementation. CAS (and presumably atomic
increment/decrement on x86) on non-shared cache lines can be made
One thing to consider is that reference counting only solves the
problem of reachability (ignoring cycles). It does not help with
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