If I understand things correctly, Traits (at least as implemented for 
Squeak) cannot include references to instance variables, and so the 
performance will largely be constrained by method send performance.  Is 
this correct?

If this is the case (that Traits relies heavily on send performance and 
therefore method lookups, etc.) I would be concerned about migrating any 
of Squeak's class library to a Traits based implementation.  This may be 
incentive enough though to seriously consider upgrading the VM to use the 
'stack frame based contexts converted to full objects as necessary', or 
any other techniques that improve send performance.

On a slightly related note, using a 3.7 VM, I see around 4 million 
sends/sec on my 3 GHz Pentium 4 HT, but about 6 million sends/sec on my 
1.2 GHz iBook G4.  The bytcodes/sec performance is higher on the P4 than 
the iBook though.  Can anyone explain this?

                -Dean






stéphane ducasse <ducasse at iam.unibe.ch>
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04/27/2005 10:25 AM
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        Subject:        Fwd: Fortress Language Specification



> http://research.sun.com/projects/plrg/fortress0618.pdf

Interesting...
and worth to read (not only for traits).

Stef




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