Thanks to all Le 8 sept. 2014 à 10:14, Sven Van Caekenberghe <s...@stfx.eu> a écrit :
> Hi Annick, > > On 08 Sep 2014, at 09:26, Annick Fron <l...@afceurope.com> wrote: > >> What is the difference between pharoS and pharo ? >> Annick > > At one point there was just the standard Squeak VM. Then Eliot started the > CogVM project, whose ultimate goal was to have a JIT compiler. That meant > that he had to change part the way the image interacted with the VM, > especially around stack and closure/block usage [this is not 100% accurate, > but the details are complex]. So he decided to tackle this in two broad > steps: first make the just mentioned changes, test that part and then do the > JIT part. > > So the Pharo S (aka Stack) VM and the Pharo (COG/JIT) VM are brothers, with > the old Squeak VM being their ancestor. > > Practically, the S VM is slower (because it does not do JIT compilation), but > much more portable (because it does not have to generate machine code). The S > VM is often used to decided whether a VM problem is JIT related or not. > > HTH, > > Sven > > >
