> If I add, let�s say, 30 000 000 elements into c. After the addition the array will be very very big. Which means that it may be in a different segment memory than the one that contains �c�. Do you feel this may be a problem? I am thinking about a long jump between c and array. Long jumps cost more than short jumps right?
>
> I don't think it'll be an issue because statistically it'll affect a minority of collections. �No, its not necessarily the case that there may be a higher cost. �This depends on how the processor's memory hierarchy works. �Further, performance may be more affected by how clustered the elements of the collection are than the collection itself.

Ah okay.
What do you mean by how the elements are clustered?

> Do you feel there are some suboptimal situation with this situation?
>
> I think it's way too early to worry about this kind of thing. �The system needs to work and be tuned. �There's plenty of time to address clustering, etc.

I am not sure to understand what clustering means here.

Thanks again for taking the time to answer questions.

Alexandre

>
>
> Alexandre
>
> NB: I cc the mailing list to see whether other may help in understand better what�s going on with segment and generations
> --
> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
> Alexandre Bergel �http://www.bergel.eu
> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
>
>
>
> On Nov 19, 2013, at 1:37 PM, Eliot Miranda <eliot.miranda@gmail.com> wrote:
>
> > Hi Alexandre,
> >
> >
> > On Mon, Nov 18, 2013 at 7:40 AM, Alexandre Bergel <alexandre.bergel@me.com> wrote:
> > Hi Eliot,
> >
> > Stef told me you are working hard on improving the Pharo VM.
> > In particular making the VM support fragmented memory. If I understand correctly, this will relieve the VM from having a continuous block of memory to hold the whole image. Really cool!
> >
> > A better term is segmented memory. �fragmentation in memory management means free space getting divided into too small pieces to be useful.
> >
> > I have a general question regarding VM. Are you aware of other Virtual machines supporting this? Does the Java VM support fragmented memory? .Net? V8?
> >
> > Any VM that uses the train algorithm supports segmented memory. �Any VM that uses "pools" or "regions" uses segmented memory. �VisualWorks' VM supports segments. �I'm pretty sure that V8 .Net & HotSpot provide segmented memory.
> >
> >
> > I would like to mention this in a research paper I am working on.
> >
> > Cheers,
> > Alexandre
> > --
> > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
> > Alexandre Bergel �http://www.bergel.eu
> > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
> >
> >
> >
> >
> >
> >
> > --
> > best,
> > Eliot
>
>
>
>
> --
> best,
> Eliot