method dictionary lookups and walking up the inheritance tree

John M McIntosh johnmci at
Tue May 16 19:37:46 UTC 2006

I recall cross checking the squeak VM at: and methodcache hit ratio's  
in 2001? and the numbers I got where still in line with
numbers observed in the "Green book"

On 16-May-06, at 12:31 PM, tim Rowledge wrote:

> On 16-May-06, at 12:05 PM, John M McIntosh wrote:
>> I'll note the cache is very efficient, someone a few years back  
>> attempted to make some changes and make the cache much much bigger
>> In testing on various platforms we could not show any improvement  
>> in the standard benchmarks  to justify the additional memory  
>> requirements.
> I think it was worse - on several machines of plausible spec it  
> actually got slower.
> VisualWorks (and probably other VMs at a guess) got some serious  
> benefits out of polymorphic inline caches. I rather doubt inline  
> caching is going to work in an interpreter but there might be some  
> advantage in making the current global cache polymorphic. It could  
> be a decent experiment to try out as a class exercise for example,  
> since even if it turns out not to be beneficial it would be  
> instructive and require all the usual investigative, analytical and  
> explicative skills. I'd even volunteer to help with reviewing and  
> grading, subject to time constraints.
> tim
> --
> tim Rowledge; tim at;
> World Ends at Ten! Pictures at 11 on Fox News!

John M. McIntosh <johnmci at> 1-800-477-2659
Corporate Smalltalk Consulting Ltd.

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