<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Aug 12, 2015 at 11:09 AM, Levente Uzonyi <span dir="ltr"><<a href="mailto:leves@elte.hu" target="_blank">leves@elte.hu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I wonder if you're creating two forwarders in case of #become:, with objects of different size, or just one forwarder for the larger object while copying the smaller object over the larger one (when possible).<br></blockquote><div><br></div><div>Right now it's the simplest thing that could possibly work. I think this is a great idea though. It would potentially eliminate the post-become stack scan if all objects can be becomed either by exchanging contents or (in one-way) shortening. Alas I don't have time for this right now. Any volunteers interested?</div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Levente<br>
<br>
On Tue, 11 Aug 2015, Eliot Miranda wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi All,<br>
who will update <a href="http://squeak.org/downloads/" rel="noreferrer" target="_blank">http://squeak.org/downloads/</a> to include the 5.0 release?<br>
<br>
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<br>
list. <br>
<br>
b) the Trunk link points to TrunkImage.zip which contains a non-Spur image.<br>
<br>
c) Spur VMs need to be linked to by an added line in the Virtual Machines list.<br>
<br>
d) Spur imagers need to be included in the Image and Changes list under Custom Installation<br>
<br>
e) The SqueakV50.sources file also needs to be included in the Current Sources list.<br>
<br>
f) we could start a History list for the 5.0 line<br>
<br>
So there are a few things to fix before 5.0 is freely downloadable.<br>
<br>
On Tue, Aug 11, 2015 at 8:23 PM, Chris Muller <<a href="mailto:ma.chris.m@gmail.com" target="_blank">ma.chris.m@gmail.com</a>> wrote:<br>
In the 17 months since Squeak 4.5 was released, a huge development<br>
effort took place to create the next generation virtual-machine for<br>
the Squeak / Pharo / Newspeak family of programming systems. Squeak<br>
is the modern incarnation of the Smalltalk-80 programming environment<br>
originally developed at the Xerox PARC.<br>
<br>
"Squeak 5" introduces this new VM and associated new memory model,<br>
collectively referred to as "Spur". Presented [1] by Eliot Miranda<br>
and Clément Béra at the 2015 International Symposium on Memory<br>
Management, this new VM affords Squeak applications a significant<br>
boost in performance and memory management. Among other<br>
optimizations, the #become operation no longer requires a memory scan.<br>
Object pinning and ephemerons are also now supported. The release<br>
notes [2] provide more details.<br>
<br>
The new memory model requires a new image file format. Although this<br>
new format results in about a 15% increased memory requirement for the<br>
same number of 4.x objects, a new segmented heap allows memory to be<br>
given back to the OS when its no longer needed, a great benefit for<br>
application servers.<br>
<br>
As forward compatibility is as important to the Squeak community as<br>
backward compatibility, Squeak 5 is delivers an image with identical<br>
content as the recent 4.6 release. Although this new Squeak 5 VM<br>
cannot open images saved under the prior 4.x Cog format, objects and<br>
code can be easily exported from the 4.x image and then imported into<br>
Squeak 5. Applications whose code runs strictly above the Smalltalk<br>
meta layer will prove remarkably compatible with the new format, most<br>
applications will require no changes whatsotever.<br>
<br>
Squeak 5 is the result of monumental effort by a tiny group of very<br>
talented people, but its also just the beginning of yet a new effort;<br>
Spur is just a stepping stone to a more ambitious goals planned over<br>
the next five years.<br>
<br>
[1] -- A Partial Read Barrier for Efficient Support of Live<br>
Object-oriented Programming<br>
<a href="http://conf.researchr.org/event/ismm-2015/ismm-2015-papers-a-partial-read-barrier-for-efficient-support-of-live-object-oriented-programming" rel="noreferrer" target="_blank">http://conf.researchr.org/event/ismm-2015/ismm-2015-papers-a-partial-read-barrier-for-efficient-support-of-live-object-oriented-programming</a><br>
<br>
[2] -- Squeak 5 Release Notes<br>
<a href="http://wiki.squeak.org/squeak/6207" rel="noreferrer" target="_blank">http://wiki.squeak.org/squeak/6207</a><br>
<br>
<br>
<br><span class="HOEnZb"><font color="#888888">
<br>
--<br>
_,,,^..^,,,_<br>
best, Eliot<br>
<br>
</font></span></blockquote>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><span style="font-size:small;border-collapse:separate"><div>_,,,^..^,,,_<br></div><div>best, Eliot</div></span></div></div></div>
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