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Annick

PharoS

What is the difference between pharoS and pharo ?
Annick

fstephany

Re: PharoS

If i'm not mistaken, pharoS uses the StackVM.

Which you don't really want unless you know you need it ;)

On Mon, Sep 8, 2014 at 9:26 AM, Annick Fron <[hidden email]> wrote:

What is the difference between pharoS and pharo ?
Annick

EstebanLM

Re: PharoS

exactly.

pharoS does not includes Cog (the JIT).

Esteban

On 08 Sep 2014, at 09:45, François Stephany <[hidden email]> wrote:

If i'm not mistaken, pharoS uses the StackVM.

Which you don't really want unless you know you need it ;)

On Mon, Sep 8, 2014 at 9:26 AM, Annick Fron <[hidden email]> wrote:
What is the difference between pharoS and pharo ?
Annick

Sven Van Caekenberghe-2

Re: PharoS

In reply to this post by Annick

Hi Annick,

On 08 Sep 2014, at 09:26, Annick Fron <[hidden email]> 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

philippeback

Re: PharoS

On Mon, Sep 8, 2014 at 10:14 AM, Sven Van Caekenberghe <[hidden email]> wrote:

Hi Annick,

On 08 Sep 2014, at 09:26, Annick Fron <[hidden email]> 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

Annick

Re: PharoS

In reply to this post by Sven Van Caekenberghe-2

Thanks to all

Le 8 sept. 2014 à 10:14, Sven Van Caekenberghe <[hidden email]> a écrit :

> Hi Annick,
>
> On 08 Sep 2014, at 09:26, Annick Fron <[hidden email]> 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
>
>
>