On Mon, Sep 8, 2014 at 10:14 AM, Sven Van Caekenberghe <[email protected]> wrote:
> Hi Annick, > > On 08 Sep 2014, at 09:26, Annick Fron <[email protected]> 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 > and PharoS is what you run on an iPad or iPhone. Phil
