[Vm-dev] #becomeUncompact not longer works in Cog/Stack VMs

[Andreas Raab]

On 5/7/2011 9:25, Tobias Pape wrote:
>> No.  It does /not/ need to be fixed.  As I said earlier it is *absurd* to throw away performance for the ability to change certain classes to become uncompact.
> When it worked in pre-cog VMs, why should it break in Cog?

Because Cog is all about performance. And there's a big performance 
difference for some classes when they are changed to be non-compact and 
Eliot didn't want to add the complexity it would take to support both a 
fast compact, and a slow non-compact version of the code. Therefore, 
some classes cannot be made non-compact in Cog, and that is a perfectly 
good tradeoff. If you really need these classes to be non-compact 
(please remind me why exactly that would matter to you) then use the 
interpreter. In order to get performance some trade-offs are necessary 
and this is one of them.

Cheers,
   - Andreas