[squeak-dev] [ANN] Squeak 5

Fabio Niephaus lists at fniephaus.com
Wed Aug 12 07:09:36 UTC 2015

Hi Eliot,
Unfortunately, I'm having technical difficulties with my personal MacBook,
but I will update the download section accordingly within the next few


On Wed 12 Aug 2015 at 04:51 Eliot Miranda <eliot.miranda at gmail.com> wrote:

> Hi All,
>     who will update http://squeak.org/downloads/ to include the 5.0
> release?
> a) I suggest that the 5.0 all-in-one have a line in the left-hand table
> that includes the 4.6 release and that it precede the 4.6 release in the
> list.
> b) the Trunk link points to TrunkImage.zip which contains a non-Spur image.
> c) Spur VMs need to be linked to by an added line in the Virtual Machines
> list.
> d) Spur imagers need to be included in the Image and Changes list under
> Custom Installation
> e) The SqueakV50.sources file also needs to be included in the Current
> Sources list.
> f) we could start a History list for the 5.0 line
> So there are a few things to fix before 5.0 is freely downloadable.
> On Tue, Aug 11, 2015 at 8:23 PM, Chris Muller <ma.chris.m at gmail.com>
> wrote:
>> In the 17 months since Squeak 4.5 was released, a huge development
>> effort took place to create the next generation virtual-machine for
>> the Squeak / Pharo / Newspeak family of programming systems.  Squeak
>> is the modern incarnation of the Smalltalk-80 programming environment
>> originally developed at the Xerox PARC.
>> "Squeak 5" introduces this new VM and associated new memory model,
>> collectively referred to as "Spur".  Presented [1] by Eliot Miranda
>> and Clément Béra at the 2015 International Symposium on Memory
>> Management, this new VM affords Squeak applications a significant
>> boost in performance and memory management.  Among other
>> optimizations, the #become operation no longer requires a memory scan.
>> Object pinning and ephemerons are also now supported.  The release
>> notes [2] provide more details.
>> The new memory model requires a new image file format.  Although this
>> new format results in about a 15% increased memory requirement for the
>> same number of 4.x objects, a new segmented heap allows memory to be
>> given back to the OS when its no longer needed, a great benefit for
>> application servers.
>> As forward compatibility is as important to the Squeak community as
>> backward compatibility, Squeak 5 is delivers an image with identical
>> content as the recent 4.6 release.  Although this new Squeak 5 VM
>> cannot open images saved under the prior 4.x Cog format, objects and
>> code can be easily exported from the 4.x image and then imported into
>> Squeak 5.  Applications whose code runs strictly above the Smalltalk
>> meta layer will prove remarkably compatible with the new format, most
>> applications will require no changes whatsotever.
>> Squeak 5 is the result of monumental effort by a tiny group of very
>> talented people, but its also just the beginning of yet a new effort;
>> Spur is just a stepping stone to a more ambitious goals planned over
>> the next five years.
>> [1] -- A Partial Read Barrier for Efficient Support of Live
>> Object-oriented Programming
>> http://conf.researchr.org/event/ismm-2015/ismm-2015-papers-a-partial-read-barrier-for-efficient-support-of-live-object-oriented-programming
>> [2] -- Squeak 5 Release Notes
>> http://wiki.squeak.org/squeak/6207
> --
> _,,,^..^,,,_
> best, Eliot
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