Short list with things to finish for D2

[Leandro Lucarella]

dsimcha, el 19 de noviembre a las 17:01 me escribiste:
> > > Unfortunately, I've come to hate the MRU idea because it would fail miserably for
> > > large arrays.  I've explained this before, but not particularly thoroughly, so
> > > I'll try to explain it more thoroughly here.  Let's say you have an array that
> > > takes up more than half of the total memory you are using.  You try to append to
> > > it and:
> > >
> > > 1.  The GC runs.  The MRU cache is therefore cleared.
> > >
> > > 2.  Your append succeeds, but the array is reallocated.
> > >
> > > 3.  You try to append again.  Now, because you have a huge piece of garbage that
> > > you just created by reallocating on the last append, the GC needs to run again.
> > > The MRU cache is cleared again.
> > >
> > > 4.  Goto 2.
> > This is not a matter of principles, but one of implementation. When you
> > GC, you can adjust the cache instead of clearing it.
> 
> Technically true, but what is a matter of principles is whether the implementation
> of arrays should be very tightly coupled to the implementation of the GC.  Fixing
> this issue would have massive ripple effects throughout the already spaghetti
> code-like GC, and might affect GC performance.  For every single object the GC
> freed, it would have to look through the MRU cache and remove it from there if
> present, too.
> 
> The point is that this **can** be done, but we probably don't **want** to
> introduce this kind of coupling, especially if we want our GC model to be sane
> enough that people might actually come along and write us a better GC one day.

Amen!

-- 
Leandro Lucarella (AKA luca)                     http://llucax.com.ar/
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