megamorphic lambda prevention

[Matt Fowles]

All~

Couldn't the VM detect hot mega-morphic methods and have them bestow some
of their hotness upon the callers.  Making their callers more likely to
inline them.  Then you have a different call site for the each which is
likely to be monomorphic.

Matt

On Thu, Jun 21, 2012 at 10:30 AM, Rémi Forax <forax at univ-mlv.fr> wrote:

> On 06/21/2012 04:12 PM, Jochen Theodorou wrote:
> > Am 21.06.2012 16:00, schrieb Rémi Forax:
> >> On 06/21/2012 03:52 PM, Jochen Theodorou wrote:
> >>> Am 21.06.2012 13:57, schrieb Krystal Mok:
> > [...]
> >>>> I wonder how well the new interpreter design in Graal would handle
> this
> >>>> kind of case, since it's supposed to have picked the good parts from
> >>>> trace-based compilation, but without actually having to do tracing.
> >>>> Can't wait to see more details of it at this year's JVM Language
> Summit.
> >>> If I understood Thomas right, then Graal doesn't have that problem.
> >>> Afaik hotspot doesn't have to have that problem too. It just was a
> >>> design decision not to make call site caching per execution path. Afaik
> >>> chaning that now would take quite some effort, but is not impossible.
> >> You can create the execution path backward, when it's needed.
>
> I was thinking that the VM can create the path backward.
>
> > you can in PHP.reboot, but in Groovy I don't have access to the full
> > execution path. Inside "each" I don't know what did call me and at the
> > point of where I call each, I don't see what each will actually do.
>
> yes, but you can detect that 'each' is a special method because
> it takes a closure (Closure) as parameter and try to do some magic.
>
> >
> > bye blackdrag
> >
>
> Rémi
>
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