On Monday, December 2, 2002, at 10:15  Uhr, jean-marie.zajac wrote:

>
> On MacOsX, VM Squeak 3.4.0Beta2 (carbon)  slightly more rapid than 
> CocoaSqueak but for a class than I have written which use essentially  
> FTPsocket, in contrast Cocoa execute the methods with a speed six fold 
> greater. Furthermore, this speed is the same that tan observed with on 
> a  PC (Squeak-GL VM). Thus carbon squeak is very slow with ftp 
> primitives.
> The execution of the primitives could be so different from a VM to 
> another ?

CocoaSqueak uses the Unix/BSD APIs for all its low-level file and 
network I/O (the code is taken directly from Ian's Unix VM).

The Carbon VM uses Carbon calls (this looks obvious, but it could 
actually use BSD calls just as well), probably based on OpenTransport, 
part of the old toolbox APIs and nowadays layered on top of the Unix 
core.

So the two have almost completely different execution paths for this 
functionality.  John and I talked about unifying the VM a while back, 
but so far haven't really achieved a lot..

Marcel

-- 
Marcel Weiher				Metaobject Software Technologies
marcel at metaobject.com		www.metaobject.com
Metaprogramming for the Graphic Arts.   HOM, IDEAs, MetaAd etc.