Magma June 2012

magma@lists.squeakfoundation.org

4 participants
3 discussions

Re: [Vm-dev] [Pharo-project] Plan/discussion/communication around new object format
by Chris Muller 15 Jun '12

15 Jun '12

(discussion branch moved to Magma list). Well, I doubt it's faster than just using Avi's regular WriteBarrier. Understand the overrides are only compiled once per class, not once per object. In the real world compilation is not a significant factor on performance. The overridden methods follow the pattern: someMethod | t1 t2 newT1 newT2 returnValue | t1 := self instVarAt: 1. t2 := self instVarAt: 2. returnValue := super someMethod. newT1==t1 ifFalse: [ self modified. ^ returnValue ]. newT2==t2 ifFalse: [ self modified. ^ returnValue ]. ^ returnValue which is probably even faster than unwinding stack all the way to the Immutable handler every time an attribute is set. Not sure, but the above is fast enough to accomplish the overall goal and substantially improve app performance. > Ok, what if we call it a "fast write-barrier provided by the VM". > Would that change your view? Igor?

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Re: selective commit
by Milan Mimica 12 Jun '12

12 Jun '12

Suppose my root is anArray. Now I load two elements from that array: a := session root at: 1. b := session root at: 2. Then I mutate both of them. Now I want to commit changes I made to 'a', but not 'b'. On 11 June 2012 22:26, Chris Muller <asqueaker(a)gmail.com> wrote: > Hi Milan, I don't understand -- ...you have a (Magma?) database and > you want to commit changes to some of the objects in the database but > not all of them? That obviously works so I guess you are asking about > something different -- could you please clarify? > > > > On Mon, Jun 11, 2012 at 1:42 PM, Milan Mimica <milan.mimica(a)gmail.com> > wrote: > > Hi > > > > Do I understand correctly that Magma doesn't support commit on per > instance > > basis? I want to commit only some of the some instances I have loaded > from > > database. > > > > > > -- > > Milan Mimica > > http://sparklet.sf.net > > > > _______________________________________________ > > Magma mailing list > > Magma(a)lists.squeakfoundation.org > > http://lists.squeakfoundation.org/mailman/listinfo/magma > > > -- Milan Mimica http://sparklet.sf.net

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selective commit
by Milan Mimica 11 Jun '12

11 Jun '12

Hi Do I understand correctly that Magma doesn't support commit on per instance basis? I want to commit only some of the some instances I have loaded from database. -- Milan Mimica http://sparklet.sf.net

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Magma June 2012