> 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.mira...@gmail.com> wrote: > > > Hi Alexandre, > > > > > > On Mon, Nov 18, 2013 at 7:40 AM, Alexandre Bergel <alexandre.ber...@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
