Re: Time to heat up the new module discussion

[Jamie McCracken <jamiemcc blueyonder co uk>]

Miguel de Icaza wrote:
> Hello,

Hi,

> > so in other words it will spike every now and again EG if under Boehm GC 
> > I have 50MB heap then in compacting mode its going to spike from 50 to 
> > 100+ MB (how much higher depends on the no. of generations you have and 
> > how incremental it is of course)
>
> Yes, but the spike is not 2x the memory you have allocated.  The spike
> is the size of the nursery (512k).

Sure for young generation collections but "major collections"  will be 
2x the allocated memory as they must include the older generations as 
well as the nursery. (thats pretty much what the page link you gave says 
unless I have misinterpreted it?)

So we will see a doubling in size spike every now and again (it is after 
all one of the main disadvantages common to *all* copying collectors so 
no need to panic!)

--
Mr Jamie McCracken
http://jamiemcc.livejournal.com/