Smalltalk and tiered compile data

[Rémi Forax]

On 02/07/2012 08:28 PM, Mark Roos wrote:
> Christian asked:
>
>         What exactly do you mean by "invalidate call sites before the 
> benchmark"?
>         Are you using MutableCallSites and call setTarget on them?
>
> Exactly.  I am using setTarget to set each call site to its initial 
> fallback method.  This should drop the
> GWT lookup chain forcing each call site to rebuild the chain.  The 
> method handles for the code   still exist but
> the GWTs that reference them are gone.  This is my current way to 
> force the call sites to get new versions
> of the method code.
>
> thanks

Mark, you should use a SwitchPoint instead of calling a lot of setTarget()
because each setTarget() may require all threads of the VM to go to a 
safepoint
so you may create a 'safepoint storm' (as coined by Dan Heidinga).

>
> mark

Rémi